THORLABS Redstone OSA305 Manual
Optical spectrum analyzers
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Summary of Contents for THORLABS Redstone OSA305
- Page 1 Redstone™ OSA305, OSA201C, OSA202C, OSA203C, OSA205C, OSA207C Optical Spectrum Analyzers Manual...
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Page 2: Table Of Contents
7.2.2. Repeated Measurements ....................22 7.2.3. Automatic Setup ......................22 7.2.4. Averaging Interferograms (Redstone OSA305 only) ............ 22 7.2.5. Signal ..........................22 7.2.6. Measurements of Pulsed Sources ................23 ... - Page 3 Optical Spectrum Analyzers 7.2.7. Wavelength Calibration (Redstone OSA305 only) ............24 7.3. Working with Data in Traces .................. 24 7.3.1. Trace Update Options ....................24 7.4. Saving and Loading Data ..................26 7.4.1. Saving Data ........................26 ...
- Page 4 Optical Spectrum Analyzers 15.1. Waste treatment is your own responsibility ..........46 15.2. Ecological background ................... 46 Chapter 16 Thorlabs Worldwide Contacts .................. 4 7 ...
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Page 5: Chapter 1 Warning Symbol Definitions
Optical Spectrum Analyzers Chapter 1: Warning Symbol Definitions Chapter 1 Warning Symbol Definitions 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
WARNING The OSA20xC instruments include a He-Ne laser. 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
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. The customer will carry the shipping costs to Thorlabs; in case of warranty repairs Thorlabs will carry the shipping costs back to the customer. -
Page 8: Chapter 4 Description
OSA20xC instruments are general-purpose analyzers with moderate resolution and high update rate. The Thorlabs FT-OSA has an FC/PC-style optical fiber input and a free-space input. After the input light is collimated, a beamsplitter divides the optical signal into two separate branches. The path length difference between the two branches is varied up to a maximum of 40 mm for the OSA20xC instruments or 160 mm for the Redstone OSA305. -
Page 9: Chapter 11 Technical Data
Rayleigh spectral resolution as those tools use several data points and curve fitting techniques. The Thorlabs OSAs utilize a built-in, actively stabilized reference laser to interferometrically record the variation of the optical path length. This reference laser is inserted into the interferometer and closely follows the same path traversed by the unknown input light field. -
Page 10: Interferogram Data Acquisition
Redstone OSA305 models instead sample 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. The data is resampled to fit up to 128 data points per reference laser period. -
Page 11: Interferogram Data Processing
As suggested by NIST we assume the CO concentration to be 450 µmol/mol. Older versions of the Thorlabs OSA software (v2.90 and older) use a modified version of Edlén’s formula, which agrees with Ciddor’s formula to less than 10... -
Page 12: Wavelength Calibration And Accuracy
1 cm OPD. The OSA20xC can move ±4 cm in OPD and thus spectral features 0.25 cm apart can be resolved, while the Redstone OSA305 can move 16 cm in OPD and resolve spectral features that are 0.0625 cm apart. - Page 13 Optical Spectrum Analyzers Chapter 4: Description Resolution in Spectrometer Mode OSA20xC, High OSA20xC, Low OSA305, Low OSA305, Medium Low OSA305, Medium High OSA305, High Wavelength (µm) Figure 3. 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 electrical bandwidth of the detectors, the instrument will run slower when higher gain settings are used.
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Page 14: Dynamic Range/Optical Rejection Ratio
It can be seen as the filter response of the OSA, and can be defined as the ratio of the power at an interesting peak to the power at a given distance from said peak. For the Thorlabs OSAs the ORR is defined with a stricter condition: instead of just considering the power at a single data point, e.g., 25 GHz from the peak,... -
Page 15: Apodization
1532 nm Frequency-Locked Laser Spectrum 1524 1526 1528 1530 1532 1534 1536 1538 1540 1542 Wavelength (nm) Figure 6. Spectrum of a 1532 nm Frequency-Locked Laser measured by a Redstone OSA305. The vertical lines represent where the ORR is measured. 4.10. -
Page 16: Software
4.13. Trigger (Redstone OSA305 only) At the back panel of the Redstone OSA305 instrument, there are four BNC connectors, some of which can be used to externally trigger a measurement. The four BNC connectors are labeled on the instrument back panel and provide the following functionality: ... - Page 17 The electrical specifications of the interlock jack are listed in Section 11.6 Interlock Specifications (Redstone OSA305 only). Note that the Redstone OSA305 requires the reference laser source to collect accurate interferograms; hence, with the Interlock unplugged, the instrument is disabled.
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Page 18: Chapter 5 Using The Free-Space Input
This can be accomplished by using the provided mounting feet to secure the OSA to the breadboard using two or more of Thorlabs’ CF175 clamping forks, as shown in Figure 10. Likewise, even though the Redstone OSA305 is solid, it is recommended to use two or more clamping forks when using the free-space input. -
Page 19: Activation Of Alignment Beam
OSA from being lifted off the table. The Redstone OSA305 free-space input accepts a beam height of 117 mm (4.6’’) above the table surface. If the beam height of your experimental setup is not consistent with the free-space input, we recommend using a periscope assembly, such as Thorlabs’... - Page 20 Figure 11. Alignment Beam Activation and Notification for OSA20xC Models The Redstone OSA305 also includes a red alignment laser, which will exit the free-space port when activated with a button in the “Free-space Alignment” window (see Figure 12). When the alignment beam is activated, one optical arm of the interferometer is blocked and no interferometric measurements can be performed, and a warning message will appear in the ThorSpectra software.
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Page 21: Free-Space Beam Alignment Example
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 Item # CPA2) to aid in the alignment. -
Page 22: Adjust Software Settings
Once the system is roughly aligned, disable the alignment beam in order to see a signal in the main software window. Change the acquisition settings to Low Resolution, and for Redstone OSA305 Low Sensitivity or for OSA20xC Medium Sensitivity. OSA20xC users should now open the “Signal” window under the Instrument menu and click the “Auto”... -
Page 23: Final Alignment
OSA between the free-space aperture and the detector; 45 cm for OSA20xC models and 64 cm for Redstone OSA305. It should be possible to have �� better than 1 mm for �� = 1000 mm, which yields an error of less than 5 x 10 (about 1 –... -
Page 24: Chapter 6 Pure Air
Pure Air 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 25: Chapter 7 Software
GUI that are specific to the OSA20x and Redstone instruments. 7.1. Spectrum View and Interferogram View The Thorlabs OSA can be operated in one of two views: Spectrum view or Interferogram view. 7.1.1. Spectrum View In Spectrum view, ... -
Page 26: Setting The Unit Of The Vertical Axis
7.2.1. Acquiring a Single Spectrum/Interferogram The Redstone OSA305 will acquire one spectrum 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 27: Measurements Of Pulsed Sources
– so called spectral ghosts – in the spectrum, but if the repetition rate of the input light is higher than about 7 kHz (Redstone OSA305) or 30 kHz (OSA20xC), the spectral ghosts will be pushed out from the vicinity of the true peak and the spectrum of the pulsed light will be close to that of a corresponding CW light source, even using a normal Single or Repeat measurement. -
Page 28: Wavelength Calibration (Redstone Osa305 Only)
7.2.7. Wavelength Calibration (Redstone OSA305 only) 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 29 Optical Spectrum Analyzers Chapter 7: Software Write: Traces with this option will be overwritten at the next acquisition. Interferogram traces (1 through 26) will be overwritten with the acquired interferogram, and spectrum traces (A through Z) will be overwritten with the calculated spectrum.
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Page 30: Saving And Loading Data
Spectrum view. 7.5. Analyzing Data Since the OSA20xC and Redstone OSA305 collect interferograms, the two left-most analysis tools are available. The other analysis tools are described in the ThorSpectra User Guide. 7.5.1. Wavelength Meter The Wavelength Meter analysis tool very accurately determines the wavelength of the input light to the spectrometer. -
Page 31: Coherence Length
Optical Spectrum Analyzers Chapter 7: Software 7.5.2. 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 32 Optical Spectrum Analyzers Chapter 7: Software Figure 25. Script Window For more information on the syntax and commands available to scripts, please see the separate manual “Scripting ThorSpectra” installed with the ThorSpectra software and found in the Windows ® Start menu. Rev D, June 16, 2022 Page 28...
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Page 33: Chapter 8 Settings
For Redstone devices, there are two additional resolution modes to choose from, “Medium High” and “Medium Low.” The Sensitivity of the Redstone OSA305 can be set to “Low”, “Medium”, or “High.” For OSA20xC devices, there are instead four options: “Low”, “Medium Low”, “Medium High”, and “High.” Using a higher sensitivity setting... -
Page 34: Environment Settings
Optical Spectrum Analyzers Chapter 8: Settings allows for higher gain settings, which can result in a higher SNR of the measurement, especially for weak sources, but also a slower update rate. Note: When changing the Resolution and/or Sensitivity settings, the speed and stroke length of the motor in the instrument will change. -
Page 35: Spectrum Settings
Optical Spectrum Analyzers Chapter 8: Settings Figure 28. Interferogram Processing Settings 8.2.4. Spectrum Settings In the Spectrum settings tab, it is possible to specify a large number of settings for the processing of the spectra. Figure 29. Spectrum Processing Settings ... - Page 36 Optical Spectrum Analyzers Chapter 8: Settings Spectrum Range: If only a sub-section of the available x-axis range is required for the measurement, it can be beneficial to crop the spectrum to the desired range to reduce the amount of data to work with. Note that this cropping is not reversible.
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Page 37: Chapter 9 Labview ® Drivers
Chapter 9: LabVIEW® Drivers ® Chapter 9 LabVIEW Drivers The Redstone OSA305 and OSA20xC instruments can be controlled by custom LabVIEW ® programs, if the required drivers have been installed. These can be downloaded from the ThorSpectra software page (https://www.thorlabs.com/software_pages/ViewSoftwarePage.cfm?Code=OSA). Before installing the LabVIEW ®... -
Page 38: Chapter 10 Troubleshooting
Simply uncheck the “Lock axis” check box and click “Ok.” Bring up the Error log by simultaneously clicking Ctrl+Shift+E. Save If all else fails it to file and attach it to an email to techsupport@thorlabs.com. Rev D, June 16, 2022 Page 34... -
Page 39: Common Specifications
20 ºC to 30 ºC. See Section 4.9. k. 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 40: Model-Specific Specifications
Minimum detectable power per nanometer using Zero Fill = 0 and the highest resolution and sensitivity settings. c. The window is removable: SM05 thread for OSA20xC and SM18 thread for Redstone OSA305. d. Specified in high-temperature mode. In low-temperature mode, the wavelength range is 1.0 2.5 µm. -
Page 41: Trigger Specifications (Redstone Osa305 Only)
Optical Spectrum Analyzers Chapter 11: Technical data 11.5. Trigger Specifications (Redstone OSA305 only) Contact Specifications Schmitt Trigger Input with 10 kOhm Pull-Up Resistor to +5 V Positive-Going Threshold Voltage, Min: 1.3 V Max: 2.5 V Trigg, AUX In Negative-Going Threshold Voltage, Min: 0.6 V Max: 1.8 V Hysteresis Voltage, Min: 0.4 V Max: 1.5 V... -
Page 42: Chapter 12 Mechanical Drawings
Optical Spectrum Analyzers Chapter 12: Mechanical Drawings Chapter 12 Mechanical Drawings 12.1. Redstone OSA305 12.1.1. Dimensions Rev D, June 16, 2022 Page 38... -
Page 43: Front And Back Panels
Optical Spectrum Analyzers Chapter 12: Mechanical Drawings 12.1.2. Front and Back Panels Page 39 STN053070-D02... -
Page 44: Osa20Xc
Optical Spectrum Analyzers Chapter 12: Mechanical Drawings 12.2. OSA20xC 12.2.1. Dimensions Rev D, June 16, 2022 Page 40... -
Page 45: Front And Back Panels
Optical Spectrum Analyzers Chapter 12: Mechanical Drawings 12.2.2. Front and Back Panels Page 41 STN053070-D02... -
Page 46: Chapter 13 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 47: Osa20Xc
Optical Spectrum Analyzers Chapter 13: Certifications and compliances 13.2. OSA20xC Category Standards or Description Electrical Equipment for Measurement, Control and EN 61326-1:2006 Laboratory Use – EMC Requirements EN55011, Group 1, Class B Emission EN55011, Group 1, Class B Conducted Emission EN 61000-3-2 AC Power Line Harmonic Emissions EN 61000-3-3... -
Page 48: Chapter 14 Appendix
Optical Spectrum Analyzers Chapter 14: Appendix Chapter 14 Appendix 14.1. Calculating Absorption Cross Sections The ThorSpectra 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 49: Apodization Functions
Optical Spectrum Analyzers Chapter 14: Appendix 14.2. Apodization Functions The following apodization functions are implemented in the ThorSpectra software: Norton-Beer �� �� 0.384093 0.087577 1 �� 0.703484 1 �� (Weak) Norton-Beer �� �� 0.152442 0.136176 1 �� 0.983734 1 �� (Medium) Norton-Beer ��... -
Page 50: Chapter 15 Regulatory
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 51 Optical Spectrum Analyzers Chapter 16: Thorlabs Worldwide Contacts Chapter 16 Thorlabs Worldwide Contacts 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 52 www.thorlabs.com...
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