Spontaneous Parametric Downconversion (SPDC) Source Chapter 1: Safety Chapter 1 Safety All statements regarding safety of operation and technical data in this instruction manual will only apply when the unit is operated correctly. Shock Warning High voltage inside. To avoid electrical shock, before powering the unit on, make sure that the protective conductor of the 3‐conductor power cord is correctly connected to the protective earth contact of the socket outlet. Improper grounding can cause electric shock resulting in severe injury or even death. Do not operate without cover installed. Explosion Warning This instrument must not be operated in an explosion‐endangered environment Laser Warning Avoid Exposure – Radiation Emitted from apertures. Do not look into the laser aperture while the laser is on. Injury to the eye may result. Laser should not be turned on unless there is an optical fiber connected to the laser output port. Caution – Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure. Caution Note: This equipment 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. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by ...
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This instrument should be kept clear of environments where liquid spills or condensing moisture are likely. It is not water resistant. To avoid damage to the instrument, do not expose it to spray, liquids, or solvents. Do not operate in wet or damp conditions. This device can only be returned when packed into the complete original packaging, including all foam packing inserts. If necessary, ask for a replacement package. Mobile telephones, cellular phones, or other radio transmitters should not be used within the range of three meters of this unit since the electromagnetic field intensity may exceed the maximum allowed disturbance values according to EN50082‐1 Laser Classification Per 21 C.F.R. §1040.10 and IEC 60825‐1:2014, the SPDC810 source is classified as a Class 1 laser. The latter form of the classification is used throughout the rest of this manual. Laser Safety Labels Figure 1 Laser Safety Label per IEC 60825‐1:2014 §7. Warning Optical alignment and laser service should only be performed by qualified professionals. Warning ...
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Spontaneous Parametric Downconversion (SPDC) Source Chapter 1: Safety Resources Safety of laser products – Part 1: Equipment classification and requirements IEC 60825‐1:2014 ISBN 978‐2‐8322‐1499‐2 PERFORMANCE STANDARDS FOR LIGHT‐EMITTING PRODUCTS 21 C.F.R. §1040 Laser Safety Guide Laser Institute of America ISBN 978‐1‐940168‐03‐6 www.lia.org/store/product/laser‐safety‐guide Rev. C, March 09, 2023 Page 3 ...
Spontaneous Parametric Downconversion (SPDC) Source Chapter 2: Description Chapter 2 Description Introduction Thorlabs’ SPDC810 is a collinear type‐II Spontaneous Parametric Down‐Conversion (SPDC) source. Inside, a nonlinear crystal converts individual 405 nm photons into pairs of orthogonally polarized 810 nm photons in a single event. These pairs are split by polarization into two channels and delivered to the two polarization maintaining (PM) fiber outputs. The 405 nm photons are produced by an integrated diode laser with an adjustable power of up to 150 mW. The −12 efficiency of the down‐conversion process is approximately 10 , leading to ...
Chapter 2: Description Operating Conditions and Environmental Requirements In order to achieve optimal performance of the laser system, please observe the following guidelines. 2.4.1 Temperature Range Control of the ambient room temperature is important for stable operation of the system. The lab temperature should be in the range of 18 °C ‐ 25 °C. If unpacking the device for the first time and it is extremely cold (from shipping conditions, for instance), allow it to come to room temperature before opening the sealed internal bag. This will prevent condensation on internal optics and damage or permanent reduction in performance. 2.4.2 Heat The SPDC810 crystal temperature is regulated by an oven, which can produce up to 25 W of heat. Under some conditions, the temperature of the SPDC810 housing may reach 50 °C. Make sure that there is sufficient clearance around the device (approximately 1" on all sides) to allow airflow. 2.4.3 Air Quality and Humidity The SPDC810 source is not hermetically sealed. Small amounts of contamination and moisture can penetrate the enclosure. An excessively dusty or humid environment will damage the system. The humidity should be controlled to avoid condensation and resultant damage to optical components. The system should not be placed close to air handling vents (cooling or heating), to avoid sudden changes of humidity and/or temperature. Rev. C, March 09, 2023 ...
2 Not Connected 3 +12 V 4 Ground Figure 3 Pin Descriptions for M8 Male Connector on the Housing Fiber Coupling Connect appropriate fiber patch cables to the output ports of the device. We recommend using the P1‐780PM‐FC‐* Thorlabs patch cables for maintaining polarization. If polarization information does not need to be retained, P1‐780Y‐FC‐* or P1‐780A‐FC‐* cables can be used. Patch cables should be clean and free of debris before being attached to the two output ports; see section 4.1 Connector Cleaning. Serial Communication The RS232 serial connection allows direct control of the integrated 405 nm pump laser. Description 1 Data Carrier Detect (DCD) 2 Received Data (RxD) ...
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Spontaneous Parametric Downconversion (SPDC) Source Chapter 3: Setup and Operation RS232 Communication Settings Baud Rate 115200 Data Bits 8 Stop Bits 1 Parity None Flow Control XON / XOFF Line Ending CR‐LF Backspace ^H ...
Spontaneous Parametric Downconversion (SPDC) Source Chapter 3: Setup and Operation 3.4.1 Terminal Commands and Queries All commands and queries are in lower case letters. Text in [ ] is optional. To signify variables, (value, type) will be used. {Units} will be called out for reference to the reader only, should not be included in typed commands, but may be in returned data. Command/Query Description ch[annel] 1 pow[er] (power, float) Set pump power in mW di[sable] 1 Disable pump echo off Disable echoing of characters from pump echo on Enable echoing of characters from pump en 1 Enable pump channel id Returns ID of pump ...
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To check the current power setting: sh pow To turn on the pump laser and enable the pump’s channel 1, send the following commands over the serial interface: la on en 1 To turn the SPDC810 off: la off Once channel 1 has been enabled, la on and la off can be used to turn it on and off. Lifetime The internal 405 nm pump laser has a limited lifetime. To maximize the useful life of the SPDC810, the pump laser should be turned off when the device is not being used. See Chapter 6 Specifications for details. ...
Spontaneous Parametric Downconversion (SPDC) Source Chapter 4: Maintenance Chapter 4 Maintenance Connector Cleaning Fiber patch cables and the connector tips inside the bulkhead connector should be cleaned every time before a connection is made. Failure to do so may result in damage to the patch cord, the internal fiber connector, or both. Thorlabs recommends our FCC‐7020 universal fiber connector cleaner (pictured below) for cleaning the tips of patch cords. To use: 1. Open the door on top of the FCC‐7020. 2. Pull the white tape out until the perforations clear the window. 3. Place the tip of the patch cord flat against the white tape on either the right or left side. 4. Drag the tip down the white tape front. 5. Repeat steps 3 ‐ 4 on the opposite end of the patch cord. Take care not to twist the connector while cleaning. Instructions for using the FBC250 are located on the Thorlabs website. FCC‐7020 FBC250 Fiber Cleaning Cloth Spool Bulkhead and Connector Cleaner A complete line of Thorlabs’ fiber optic cleaning products can be found on the web at www.thorlabs.com. Page 10 TTN209244‐D02 ...
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Spontaneous Parametric Downconversion (SPDC) Source Chapter 4: Maintenance Alignment The internal alignment of the SPDC810 is very sensitive and may become misaligned during shipping and handling. Note that specialized photodetectors and electronics are required to measure the output of the SPDC810. Without such equipment, a useful signal for alignment will not be available. Refer to the SPDC810 specifications for information needed to choose appropriate detection equipment. The x and y adjustments of a single internal mirror are available through access holes covered by the hex screws, shown below, on the side of the SPDC810 housing (see Figure 2). The hex screws and internal adjusters accept a 5/64" or 2 mm hex driver. See Chapter 7 Mechanical Drawing for the location of these adjusters on the device housing. y x Figure 5 Mirror alignment Adjusters Before using these adjusters, make sure that you have some coincidence signal. You should only make changes to these adjusters when viewing the live coincidence signal rate. The alignment precision required for time‐correlated photons is significantly more challenging than the alignment necessary to achieve uncorrelated photons in both channels. The alignment that generates the maximum ...
Spontaneous Parametric Downconversion (SPDC) Source Chapter 5: Troubleshooting Chapter 5 Troubleshooting Description Possible Cause Solution Internal misalignment Perform the mirror adjustment described in 4.2 Alignment. Zero or low Photons Low pump power Increase the pump power. Dirty or damaged fibers Inspect and clean the bulkhead connectors and patch cables. Crystal temperature Allow more time for the crystal has not stabilized temperature to stabilize. Wavelengths of the Device overheating Ensure that the device has sufficient signal and idler channels room for cooling and that the are different ambient temperature meets requirements. Low pump power Check to make sure the pump laser is enabled and set to a sufficiently high percentage. Incorrect serial settings Confirm RS232 settings described in 3.4. Serial Communication Incorrect cabling The provided cable is appropriate cannot be established for most RS232 scenarios. However, ...
Spontaneous Parametric Downconversion (SPDC) Source Chapter 6: Specifications Chapter 6 Specifications Item # SPDC810 Operating Wavelength 810 ± 2 nm a,b η (Detector Excluded) >0.45 Max Pairs/Second >450 kHz Wavelength Stability ±2.5 nm Photon Bandwidth ~10 nm Temperature Control No Wavelength Tuning Range None ( τ = 0) <0.1 Extinction Ratio >17 dB Lifetime >2500 Hours of Pump Emission Pump Laser Power Up to 150 mW User Serviceable No Input Voltage ...
Spontaneous Parametric Downconversion (SPDC) Source Chapter 9: Warranty and RMA Information Chapter 9 Warranty and RMA Information Thorlabs verifies our compliance with the WEEE (Waste Electrical and Electronic Equipment) directive of the European Community and the corresponding national laws. Accordingly, all end users in the EC may return “end of life” Annex I category electrical and electronic equipment sold after August 13, 2005 to Thorlabs, without incurring disposal charges. Eligible units are marked with the crossed out “wheelie bin” logo (see right), were sold to and are currently owned by a company or institute within the EC and are not dissembled or contaminated. Contact Thorlabs for Annex I more information. Waste treatment is your own responsibility. “End of life” units must be returned to Thorlabs or handed to a company specializing in waste recovery. Do not dispose of the unit in a litter bin or at a public waste disposal site. It is the user’s responsibility to delete all private data stored on the device ...
Spontaneous Parametric Downconversion (SPDC) Source Chapter 10: Thorlabs Worldwide Contacts Chapter 10 Thorlabs Worldwide Contacts For technical support or sales inquiries, please visit us at for our most up‐to‐date www.thorlabs.com/contact contact information. USA, Canada, and South America UK and Ireland Thorlabs, Inc. Thorlabs Ltd. sales@thorlabs.com sales.uk@thorlabs.com techsupport@thorlabs.com techsupport.uk@thorlabs.com Europe Scandinavia Thorlabs GmbH Thorlabs Sweden AB europe@thorlabs.com scandinavia@thorlabs.com France Brazil Thorlabs SAS Thorlabs Vendas de Fotônicos Ltda. sales.fr@thorlabs.com ...
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