THORLABS Redstone OSA305 User Manual
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THORLABS Redstone OSA305 User Manual

Optical spectrum analyzer
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Redstone™ OSA305
Optical Spectrum
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User Guide

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Summary of Contents for THORLABS Redstone OSA305

  • Page 1 Redstone™ OSA305 Optical Spectrum Analyzer User Guide...

  • Page 2: Table Of Contents

    Redstone™ Optical Spectrum Analyzer Table of Contents Chapter 1 Warning Symbol Definitions ..................1 Chapter 2 Safety ..........................2 Chapter 3 Warranty .......................... 3 3.1. Restriction of Warranty ..................... 3 Description ........................4 Chapter 4 4.1. Introduction ....................... 4 4.2. Interferometer Design ....................4 4.3.
  • Page 3 Redstone™ Optical Spectrum Analyzer 8.3. Customizing the Display ..................20 8.3.1. Zooming and Scrolling the Horizontal Axis ..............20 8.3.2. Zooming and Scrolling the Vertical Axis ............... 21 8.3.3. Setting the Unit of the Horizontal Axis ................21 8.3.4. Displaying the Secondary Horizontal Axis ..............22 8.3.5.
  • Page 4 Chapter 15 15.1. Calculating Absorption Cross Sections ............77 15.2. Apodization Functions ..................78 Chapter 16 Regulatory ........................79 16.1. Waste treatment is your own responsibility ..........79 16.2. Ecological background ................... 79 Thorlabs Worldwide Contacts ..................80 Chapter 17...

  • Page 5: Chapter 1 Warning Symbol Definitions

    Redstone™ Optical Spectrum Analyzer Chapter 1: Warning Symbol Definitions Warning Symbol Definitions Chapter 1 Below is a list of warning symbols you may encounter in this manual or on your device. Symbol Description Direct Current Alternating Current Both Direct and Alternating Current Earth Ground Terminal Protective Conductor Terminal Frame or Chassis Terminal...

  • Page 6: Chapter 2 Safety

    Only use the instrument standing on its feet. WARNING The Redstone OSA305 includes a red laser and an infrared laser. The classification of these lasers follows the European Standard IEC 60825-1:2014. Viewing the laser output with telescopic optical instruments (for example, telescopes and binoculars) close to the aperture may pose an eye hazard! Using the instrument in combination with collimating optics may have an impact on the assigned laser classification.

  • Page 7: Chapter 3 Warranty

    During this warranty period, Thorlabs will see to defaults by repair or exchange if the product is entitled to warranty. For warranty repairs or service the unit must be sent back to Thorlabs or to a place determined by Thorlabs.

  • Page 8: Chapter 4 Description

    (ZPD), which is located significantly closer to one end of the stroke. The Redstone OSA305 has a 80 mm stroke length capacity, and thus a maximum OPD of 160 mm and a spectral resolution of 2.0 GHz or 0.0625 cm .
  • Page 9 Redstone™ Optical Spectrum Analyzer Chapter 4: Description Figure 1. Optical Schematic of the Thorlabs Redstone OSA305 4.3. Interferogram Data Acquisition The Redstone OSA samples the interferogram at a fixed frequency of up to 1 MHz with an 18-bit ADC while the retroreflector platform moves at a constant speed controlled by a PID loop.

  • Page 10: Interferogram Data Acquisition

    While a Michelson interferometer depends on the input light not changing properties during a measurement, it is possible to measure pulsed sources with a Thorlabs OSA under certain circumstances. The pulses will introduce artifacts – so called spectral ghosts – in the spectrum, but if the repetition rate of the input light is...

  • Page 11: Wavelength Calibration And Accuracy

    . To distinguish between these signals in the interferogram, we would need to move 1 cm away from the point of zero path difference (ZPD). The Redstone OSA305 can move 16 cm in OPD and thus spectral features that are 0.0625 cm apart can be resolved.
  • Page 12 Redstone™ Optical Spectrum Analyzer Chapter 4: Description Resolution in Spectrometer Mode OSA20xC, High OSA20xC, Low OSA305, Low OSA305, Medium Low OSA305, Medium High OSA305, High Wavelength (µm) Figure 2. Resolution as a Function of Wavelength The sensitivity of the instrument depends on the electronic gain used in the sensor electronics. Since an increased gain setting reduces the bandwidth of the detectors, the instrument will run slower when higher gain settings are used.

  • Page 13: Dynamic Range/Optical Rejection Ratio

    OSA rather than the tested source. Figure 5 and the table below provide some example values for the optical rejection ratio of the Redstone OSA305 for a narrowband source at 1532 nm with the following settings: High Resolution, Low Sensitivity, average of 5 traces, Hann apodization, and Zero Fill = 2.

  • Page 14: Absolute Power And Power Density

    1532 nm Frequency-Locked Laser Spectrum 1524 1526 1528 1530 1532 1534 1536 1538 1540 1542 Wavelength (nm) Figure 5. Spectrum of a 1532 nm Frequency-Locked Laser measured by a Redstone OSA305. The vertical lines represent where the ORR is measured. 4.9.

  • Page 15: Zero Fill

    Chapters 8 and 9. 4.13. Trigger At the back panel of the Redstone OSA305 instrument, there are four BNC contacts which can be used to externally trigger a measurement. To do this, the Trigger Type combo box in the Settings menu’s Acquisition tab must be set to “External.”...
  • Page 16 The electrical specifications of the interlock jack are listed in Section 13.5. Note that the Redstone OSA305 requires the reference laser source to collect accurate interferograms; hence, with the Interlock unplugged, the instrument is disabled.

  • Page 17: Chapter 5 Using The Free-Space Input

    Place the OSA on a flat and stable surface, preferably an optical table. If the free-space input is to be used, it is recommended to use two Thorlabs CF175 clamping forks on the mounting feet to secure the OSA to the optical table and reduce any vibrations that might interfere with the measurements.

  • Page 18: Activation Of Alignment Beam

    Use the mirror closest to the test source to steer the input source into the OSA, using a viewing card (such as Thorlabs Item # VRC2) and/or an alignment plate (such as Thorlabs...

  • Page 19: Osa Software Settings

    Redstone™ Optical Spectrum Analyzer Chapter 5: Using the Free-Space Input Item # CPA2) to aid in the alignment. Then, use the mirror closest to the OSA to point the alignment beam emitted by the OSA at the center of the input source. Repeat these steps until the test source beam and alignment beam overlap over the entire beam path.

  • Page 20: Final Alignment

    Redstone™ Optical Spectrum Analyzer Chapter 5: Using the Free-Space Input Figure 11. An Example of a Helpful Windows Layout for Free-Space Alignment 5.3.3. Final Alignment Repeat the alignment process in Section 5.3.1, but utilize the OSA readings instead of the viewing card to optimize the alignment.

  • Page 21: Chapter 6 Pure Air

    Chapter 6 OSA instruments have two hose connectors which can be connected to an external air purifier, such as Thorlabs Item # PACU Pure Air Circulator Unit. We recommend a flow rate of 2 liters/min. Simply attach two hoses (one supply and one return) to the 1/4"...

  • Page 22: Chapter 7 Software Setup

    7.2. Software Installation The Thorlabs OSA software is shipped with a laptop with all required drivers and software pre-installed. If you wish to install the software on another computer or need to re-install the software, please follow the instructions below.

  • Page 23: Connecting To The Pc

    7.3. Connecting to the PC After the software installation has finished, you can connect the Thorlabs OSA to an available USB port on the PC. Use only the cable that is included with the OSA, e.g., Thorlabs Item # USB3-MBA-118.

  • Page 24: Chapter 8 Operation

    Operation Chapter 8 8.1. Interface Overview When the Thorlabs OSA software is first started, the main window is composed of five areas: • Main Menu: contains the command buttons • Settings Bar: provides quick access to the settings of the software •...

  • Page 25: Interferogram View

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation • Only analysis tools and math tools applicable to spectra are enabled • Interferograms are still acquired in the background but will not be displayed until Interferogram view is selected 8.2.2. Interferogram View In Interferogram view, •...

  • Page 26: Zooming And Scrolling The Vertical Axis

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 15. Axis Properties Dialog Opened for the Horizontal Axis If two vertical line markers are displayed, the horizontal display range can also be set to the range between the two line markers by opening the Display menu and pressing the button “Get From Line Markers.” To restore the display area to the full horizontal range, open the Display menu and click the button “Zoom Out”, or scroll the mouse wheel until the full horizontal axis is displayed.

  • Page 27: Displaying The Secondary Horizontal Axis

    8.3.6. Displaying the Secondary Vertical Axis In the Thorlabs OSA Software the traces can be shown on either the primary axis with its labels and units displayed to the left of the graph or on the secondary axis with its labels and units displayed to the right of the graph.

  • Page 28: Hiding The Menus And Full Screen Mode

    Figure 19. Displaying Data on Both the Primary and Secondary Vertical Axes 8.3.7. Hiding the Menus and Full Screen Mode There are two buttons located in the top right corner of the main menu, close to the Thorlabs logo. •...

  • Page 29: Switching Between Power Density And Absolute Power

    The power per wavelength, or frequency, unit is called the power density (e.g., mW/nm or dBm/THz) and the power per resolution unit is called the absolute power. By default, the Thorlabs OSA is set to display the retrieved spectra in Absolute Power mode. The display can be switched between Power Density and Absolute Power mode by using the combo box in the settings bar (see Figure 20).

  • Page 30: Displaying The Interferogram While Working In Spectrum View

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 21. Split View 8.3.10. Displaying the Interferogram While Working in Spectrum View Selecting the option “Interferogram View” in the combo box under the Display menu will show a secondary display area above the main display area. The upper display will show the entire interferogram while the lower will display the spectrum.

  • Page 31: Dark Room Mode

    “Connect Devices” button found under the Instrument menu. This will cause the software to search all USB ports for connected Thorlabs spectrometers as well as read their properties and settings. Note that the software interface may freeze for a short while during the time in which the scan is performed. If the device cannot be found please see Chapter 12 Troubleshooting.

  • Page 32: Acquiring A Single Spectrum/Interferogram

    Any trace set to automatic calculation will also be updated. The Redstone OSA305 will acquire one spectrum/interferogram per detector, which can be shown as a stitched spectrum or separately. Note that the noise floor of the two detectors might not be at the same level, which presents itself as a ramp in the spectrum when there is no light in the overlap region.

  • Page 33: Repeated Measurements

    In the Thorlabs OSA software, spectra are averaged as a rolling average, meaning that the screen will be updated for each new spectrum that is collected and the average of all the measured spectra will be displayed on the screen.

  • Page 34: Signal

    While a Michelson interferometer depends on the input light not changing properties during a measurement, it is possible to measure pulsed sources with a Thorlabs OSA under certain circumstances. The pulses will introduce artifacts – so called spectral ghosts – in the spectrum, but if the repetition rate of the input light is...

  • Page 35: Wavelength Calibration

    Figure 28. Pulsed Source Measurement Dialog 8.4.10. Wavelength Calibration The Redstone OSA305 instrument includes an internal reference laser that is used to track the movement of the moving retroreflector. This laser is frequency-locked and can thus serve as a calibration laser with a well- defined wavelength down to 0.1 pm.

  • Page 36: Moving Markers

    Fixed Markers The Thorlabs OSA software can handle up to 2048 fixed markers. A fixed marker has a fixed horizontal position and is connected to a single trace (not necessarily the Active Trace) and will track the value of its trace at the given position.

  • Page 37: Moving Fixed Markers

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation 8.6.2. Moving Fixed Markers A fixed marker can be moved to a specific position by typing a new number into the Position column in the data table, see Figure 3231. 8.6.3. Automatically Mark Peaks Pressing the button “Mark Peaks”...

  • Page 38: Working With Data In Traces

    Working with Data in Traces The collected interferograms and spectra are stored in what are called “traces.” The Thorlabs OSA software can handle up to 26 traces labeled from A to Z for spectra and from 1 to 26 for interferograms. The controls for the traces are found in the area between the data display area and the main menu (see Figure 14).

  • Page 39: User-Defined Update Options

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation • Quotient: Traces with this option will be updated as the quotient between two other traces to the left in the Trace controls bar. The Trace Label will signify how the trace will be calculated, e.g., “B/A” or “A/C.” This trace will be updated when any of the traces involved in its calculation are updated.

  • Page 40: Viewing Properties Of A Trace

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation • Exp(-A*B) • -Log10(A/B) • MinHold(A-B) 8.7.4. Viewing Properties of a Trace To see the properties of a trace, click on the icon or the label of the trace that you want to inspect, and select the menu item “View Info.”...
  • Page 41 Redstone™ Optical Spectrum Analyzer Chapter 8: Operation • Spectrum traces are identified by letters A through Z (case insensitive); interferogram traces are identified by “Int1” through “Int26” (case insensitive). Only the traces which can be seen in the trace controls bar can be used. •...

  • Page 42: Functional Traces (Traces Defined By A Function)

    The Thorlabs OSA software can read and write the following spectral file formats: • Thorlabs OSA Spectrum file format (.spf2 / .spf2x): Native file format for Thorlabs OSA Software. • Comma separated values (.csv) with Thorlabs OSA header: Raw ASCII file format with a header including information about the trace and acquisition settings.

  • Page 43: Saving Data

    File menu or select the menu item “Save All Traces” found in the Trace Options menu. This only allows the data to be stored in Thorlabs OSA Spectrum File format (.spf2 / .spf2x) or as raw data in ASCII file format, but in the latter case the files cannot be read by the Thorlabs OSA software.
  • Page 44 Redstone™ Optical Spectrum Analyzer Chapter 8: Operation The automatic save feature is enabled and configured by clicking “AutoSave” in the File menu. This brings up the dialog displayed below. Figure 39. Setting Up Automatic Saving of Traces Follow the steps below to enable automatic data saving: 1.

  • Page 45: Replaying Automatically Saved Data

    Analyzing Data The Thorlabs OSA software contains a number of analysis tools, each of which analyzes one aspect of the data from the spectrometer. The result of each analysis is displayed in a panel below the main data display area, or in a separate floating window.

  • Page 46: Floating Windows

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 42. Analysis menu. Not all analysis tools are available in all views for all spectrometers. 8.9.1. Floating Windows Analysis results that do not contain large amounts of data (and therefore do not require much space) are shown in a floating window above the upper-right part of the main data display area (see Figure 4342).

  • Page 47: Wavelength Meter

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 44. Power Analysis tool with Enabled Range Lines and Fill 8.9.3. Wavelength Meter The Wavelength Meter analysis tool very accurately determines the wavelength of the input light to the spectrometer. This analysis is only available for light from sources with a bandwidth of 10 GHz or less. This tool works by analyzing the periodicity of the collected interferograms before apodization is performed.

  • Page 48: Coherence Length

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation If Dark Room mode (Section 8.3.12) is activated while the Wavelength Meter tool is active, the display will not be “dark” until the window is closed and reopened. 8.9.4. Coherence Length Coherence length analysis uses the interferogram to estimate the coherence length of the input. The coherence length measurement looks at the envelope of the interferogram and calculates the coherence length as the shortest optical path length difference over which the envelope amplitude decreases to 1/e of its maximum on both sides.

  • Page 49: Peak Track

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation not be equidistant). Next, the average intensity around the left midpoint and around the right midpoint is calculated. These are the so-called left and right noise areas. Finally, the noise at the peak is linearly interpolated based upon these two values and their distance from the current peak.
  • Page 50 Redstone™ Optical Spectrum Analyzer Chapter 8: Operation • Range: Limits the x-axis range over which the search for peaks is performed. • Maximum Number of Peaks (found in the Settings dialog box behind the cogwheels icon): Limits the number of peaks returned by the Peak Track analysis tool. The default value is 200 peaks; the maximum value is 2048 peaks.

  • Page 51: Valley Track

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation • Peak Location: The x-axis location of the maximum value of the peak. • Peak Level: The maximum peak value. • Width: The width of the peak at “Min Peak Height” dB below the maximum value. •...

  • Page 52: Statistics Analysis

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation If no valleys are found by the Valley Track tool, check the Threshold and Min valley depth settings to make sure that the expected valleys in the spectrum are deeper than these constraints. The settings can be changed directly in the tool options panel found to the left of the data table in the Valley Track analysis window.

  • Page 53: Curve Fit

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation �� ∑(�� − ��̅ ) �� �� − 1 ��=1 where �� is the number of samples and ��̅ is the average value over the analyzed range. • Standard Deviation: The sample standard deviation of the trace over the analyzed range. This is the square root of the sample variance above.
  • Page 54 Redstone™ Optical Spectrum Analyzer Chapter 8: Operation displays the values of the fit parameters. The mathematical function used in the curve fit is a sum of different components. The following components can be used as terms in this function: • Polynomials with an order from 0 to 9 •...

  • Page 55: Power Analysis

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Getting the Result When the fit is finished, the fit parameters as well as the values and standard errors thereof are displayed in a table in the Curve fit tool window. The fitted curve is also overlaid on the data in the main data display area for visual inspection.
  • Page 56 Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Power Analysis tracks the incident optical power into the spectrometer (see Section 13.1 for the precision of the power analysis at different wavelengths). The optical power is calculated by integrating the Active trace over a x-axis range.

  • Page 57: Long-Term Analysis

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 54. The Zero Fill Factor is Important when Measuring Narrowband Light Sources Since the wavelength range of the OSA is wide and the dynamic range of the OSA is limited (see Section 4.7 Resolution and Sensitivity), the Power Analysis tool will give an exceedingly high value if the x-axis range is not limited.
  • Page 58 Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 55. Location of the Long-Term Analysis Button in an Analysis Tool Window Clicking on Analysis and “Long-Term” will open a dialog box where the parameters to be monitored can be selected, as well as the desired duration of the test. Figure 56.
  • Page 59 Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 57. Setting up the Long-Term Analysis – Selecting Parameters to Track The parameters to track can be selected in the “Parameters” tab of the Long-Term setup dialog box. The left section of the dialog shows the types of parameters which can be collected. Selecting one group shows the available parameters and the options for the collection in the right section.
  • Page 60 (note that this window may be hidden behind the main window of the Thorlabs OSA software). Each graph in the window can be minimized by clicking on the small icon to the left of the parameter name. This will automatically make the other graphs in the dialog larger.

  • Page 61: References

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 59. Long-Term Window The results of the measurement can be stored to file by pressing the “Save” button and a screenshot of the measurement can be stored as an image file or printed by pressing the “Save Image” or “Print Image” buttons. 8.10.
  • Page 62 Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 60. Reference Database Window Converting HITRAN References into Absorption Cross Sections, Absorption Spectra, or Transmission Spectra A line-by-line reference must be converted into a regular spectrum before it can be used in the software. This spectrum will be used during the Reference fitting step to help account for line-shifts, modulations in line intensity, line broadening caused by air, and self-broadening.

  • Page 63: Reference Fitting

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 61. Reference Spectrum Calculation Setup Window This dialog box contains a drop-down menu that allows the user to choose the absorption cross section, absorption spectrum, or transmission spectrum as the output of the calculation. Please note that if an absorption or transmission spectrum is desired, the dialog box will prompt the user to enter the optical path length through the gas of interest;...

  • Page 64: Baseline Correction

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 62. Setting Up a Fit in the Reference Fit Window The wavelength range over which the fit is performed can be changed by clicking on the blue, underlined wavelength range in the Settings section. To perform the fit, click the “Do Fit” button. The Reference Fit dialog box will then contain a graph that displays the measured spectrum, each scaled reference spectrum, and the sum of all the reference spectra.

  • Page 65: Keyboard Shortcuts

    Redstone™ Optical Spectrum Analyzer Chapter 8: Operation Figure 64. Baseline Correction Window To perform a baseline correction, click the “Baseline” button in the Reference menu. The Baseline correction dialog box, which allows you to adjust the baseline correction while viewing the results of your adjustments in real time, will appear.
  • Page 66 Redstone™ Optical Spectrum Analyzer Chapter 8: Operation • Ctrl+I: Show information about the currently Active Trace • Ctrl+D: Switch between Spectrum and Interferogram view (Advanced level only) • Ctrl+L: Toggle between linear and logarithmic scaling (Spectrum view only) • Ctrl+1: Enable/disable movable line marker #1 •...

  • Page 67: Chapter 9 Settings

    Redstone™ Optical Spectrum Analyzer Chapter 9: Settings Settings Chapter 9 Pressing the Settings button in the main menu will open the Settings dialog. By default, the Settings dialog box will start in Basic level. To see more advanced settings, press the “Switch to Advanced level” button in the lower left corner of the dialog.

  • Page 68: Peak Track Settings

    Redstone™ Optical Spectrum Analyzer Chapter 9: Settings If the check box “Activate Persistence” is checked, the display will also display the last few spectra/interferograms acquired in a more faded nuance. Note: Enabling persistence might severely slow down the update rate of the screen. Figure 66.

  • Page 69: System Settings

    Low”, or “Low” (lower resolution, faster update rate). The Sensitivity of the Redstone OSA305 can be set to “Low”, “Medium”, or “High.” Using a higher sensitivity setting gives a higher SNR of the measurement but also a slower update rate.

  • Page 70: Environment Settings

    Redstone™ Optical Spectrum Analyzer Chapter 9: Settings Figure 68. Acquisition Settings Tab The gain of the detectors can be specified using the combo box(es) on the Acquisition tab. The “Automatic” option automatically adjusts the gain used after each acquired interferogram to optimize the SNR of the acquired spectra.

  • Page 71: Spectrum Settings

    Redstone™ Optical Spectrum Analyzer Chapter 9: Settings Figure 69. Interferogram Processing Settings 9.2.4. Spectrum Settings In the Spectrum settings tab, it is possible to specify a large number of settings for the processing of the spectra. Figure 70. Spectrum Processing Settings •...

  • Page 72: Saving And Loading Settings

    Saving and Loading Settings When the Thorlabs OSA software closes, it will store the currently used settings to file and restore them during the next startup. However, when alternating between different sets of settings it can be beneficial to store settings to file and restore these at a later time.
  • Page 73 Redstone™ Optical Spectrum Analyzer Chapter 9: Settings Figure 72. Load Acquisition Settings Dialog Page 69 STN053070-D02...

  • Page 74: Chapter 10 Virtual Instruments

    OSA and add it to the list of instruments displayed in the Devices dialog. Figure 73. Virtual Devices Dialog Once the virtual instrument is setup it can be operated in the same way as a regular Thorlabs OSA, for instance, press the button “Repeat” or “Single” to acquire interferograms/spectra from the instrument.
  • Page 75 Before installing the LabVIEW driver, please make sure that the Thorlabs OSA application has been installed. During the installation of the Thorlabs OSA application, is it necessary to select the option to also include 32-bit ® OSA library if using 32-bit LabVIEW in a 64-bit OS (see Section 7.2 Software Installation).

  • Page 76: Chapter 11 Troubleshooting

    Section 8.3 Customizing the Display. If all else fails Bring up the Error log by simultaneously clicking Ctrl+Shift+E. Save it to file and attach it to an email to techsupport@thorlabs.com. Rev C, January 21, 2022 Page 72...

  • Page 77: Chapter 12 Technical Data

    See Section 4.8. Minimum detectable power per nanometer using using Zero Fill = 0 and the highest resolution and sensitivity settings. m. Connectors for other fiber input receptacles are available upon request. Contact techsupport@thorlabs.com for details. Each specification is valid for a single mode FC/PC-terminated patch cable, as well as for a collimated free-space beam with diameter <3 mm and divergence <3 mrad, assuming the included protective window is installed in the free-space...

  • Page 78: Update Frequency

    Redstone™ Optical Spectrum Analyzer Chapter 13: Technical data 13.2. Update Frequency Time Between Updates (Update Frequency) Resolution Sensitivity Medium Low Medium High High 1.6 s (0.64 Hz) 2.0 s (0.51 Hz) 3.7 s (0.27 Hz) 9.5 s (0.11 Hz) Medium 3.1 s (0.32 Hz) 4.1 s (0.24 Hz) 8.6 s (0.12 Hz)

  • Page 79: Chapter 13 Mechanical Drawings

    Redstone™ Optical Spectrum Analyzer Chapter 14: Mechanical Drawings Mechanical Drawings Chapter 14 14.1. Dimensions Page 75 STN053070-D02...

  • Page 80: Front And Back Panels

    Redstone™ Optical Spectrum Analyzer Chapter 14: Mechanical Drawings 14.2. Front and Back Panels Rev C, January 21, 2022 Page 76...

  • Page 81: Chapter 14 Certifications And Compliances

    If the system requires cleaning, wipe with a dry cloth. Do not use solvents (e.g. ethanol, etc.). FCC Compliance Statement Redstone OSA305 has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.

  • Page 82: Chapter 15 Appendix

    Redstone™ Optical Spectrum Analyzer Chapter 16: Appendix Appendix Chapter 16 16.1. Calculating Absorption Cross Sections As described in Section 8.10, the OSA software calculates absorption cross sections from the HITRAN line-by- line references by separating each line into a line strength and a line shape: ��...

  • Page 83: Apodization Functions

    Redstone™ Optical Spectrum Analyzer Chapter 16: Appendix 16.2. Apodization Functions The following apodization functions are implemented in the OSA software: �� �� Norton-Beer �� ( �� ) = 0.384093 − 0.087577 (1 − ) + 0.703484 (1 − (Weak) ( �� − 1 ) ( ��...

  • Page 84: Chapter 16 Regulatory

    17.1. Waste treatment is your own responsibility If you do not return an “end of life” unit to Thorlabs, you must hand it to a company specialized in waste recovery. Do not dispose of the unit in a litter bin or at a public waste disposal site.

  • Page 85: Chapter 17 Thorlabs Worldwide Contacts

    Redstone™ Optical Spectrum Analyzer Chapter 18: Thorlabs Worldwide Contacts Thorlabs Worldwide Contacts Chapter 18 For technical support or sales inquiries, please visit us at www.thorlabs.com/contact for our most up-to-date contact information. USA, Canada, and South America UK and Ireland Thorlabs, Inc.
  • Page 86 www.thorlabs.com...

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