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d2:spectroscopy_module_212

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d2:spectroscopy_module_212 [2014/12/03 00:32] – [Inputs, Outputs, and Controls] Michael Radunskyd2:spectroscopy_module_212 [2023/04/18 16:31] (current) – external edit 127.0.0.1
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 =====Description===== =====Description=====
  
-The D2-212 saturated absorption spectroscopy module provides error signals derived from saturated absorption spectroscopy of atomic rubidium, cesium, or potassium. It contains a vapor cell, internal temperature controller, balanced photodetectors, and optics.  Temperature control stabilizes the number density of atoms in the cell.The photodiode output is shot-noise limited out to greater than 5 MHz for photocurrents of 100 μA and above.  The high bandwidth of the feedback enables tight solid locking that is immune to vibrations and shock.  The D2-212 is powered by a cable that plugs into the power connectors on any D2 series electronics module or into an ICE-PB1 board, depending on which system you purchased.+The D2-212 saturated absorption spectroscopy module provides error signals derived from saturated absorption spectroscopy of atomic rubidium, cesium, or potassium. It contains a vapor cell, internal temperature controller, a single photodetector, and optics.  Temperature control stabilizes the number density of atoms in the cell.The photodiode output is shot-noise limited out to greater than 5 MHz for photocurrents of 100 μA and above.  The high bandwidth of the feedback enables tight solid locking that is immune to vibrations and shock.  The D2-212 is powered by a cable that plugs into the power connectors on any D2 series electronics module or into an ICE-PB1 board, depending on which system you purchased. 
 + 
 +=====Purchase Includes===== 
 +  * D2-212 Spectroscopy Module 
 +  * VPN00463 SMA cable (6ft) 
  
 ===== Absolute Maximum Ratings ===== ===== Absolute Maximum Ratings =====
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 =====Inputs, Outputs, and Controls===== =====Inputs, Outputs, and Controls=====
  
-<imgcaption front|>{{ :d2:d2-212:frontlegend.jpg?nolink |D2-212 Connectors}}</imgcaption>+<imgcaption front|>{{ :d2:d2-212:frontview-labeled-for-manual.jpg?nolink |D2-212 Connectors}}</imgcaption>
  
 **Input Connector**** (****6-pin circular)** **Input Connector**** (****6-pin circular)**
  
-Power from the D2-series power bus or other power supply are made through a 6-pin circular connector ([[http://www.digikey.com/product-detail/en/HR10A-7R-6SB(73)/HR1608-ND/1095466?WT.srch=1&WT.medium=cpc&WT.mc_id=IQ59989287-VQ2-g-VQ6-40609413915-VQ15-1t1-VQ16-c|Hirose HR10A-7R-6SB]]) shown in <imgref front>.  The pin definitions (pin numbers are marked on the connectors) are listed below.+Power from the D2-005 Power Supply, ICE-PB1 Power Buss, or other power supply are made through a Hirose 6-pin circular connector ([[http://www.digikey.com/product-detail/en/HR10A-7TR-6SA/HR357-ND/510211|HR10A-7TR-6SA]]) shown in <imgref front> and <imgref hirose_pinout>.  The pin definitions (pin numbers are marked on the connectors) are listed in <tabref connector>.
  
-<WRAP center round box 500px> +<imgcaption hirose_pinout|Pin numbering on female Hirose 6-pin connector>{{  :d2:d2-160:hirose-connector.png?200  }}</imgcaption> 
-^  Pin  ^  Input Voltage  ^  Max Current Draw  ^ Notes ^ + 
-|  1  |  +5V  |  1.5A  | | +<WRAP center round box 900px><tabcaption connector> 
-|  2  |  No Connect  | | | +^  Hirose Pin  ^  DB-9 Pin (if applicable)  ^  Input Voltage        ^  Max Current Draw  ^  Notes                                                         ^ 
-|  3  |  +5V Ground  | | Return path for high current +5V. | +|  1           |  4 and 5                   |  Signal Power Ground  |                    | Return path for power rail.                                    | 
-|  4  |  Signal Ground  | | Return path for voltages on pins 5 & 6. | +|  2           |  8                         |  -15 V                |  100mA             | See note below.                                                | 
-|  5  |  -15 V  |  100mA  | See note below. | +|  3           |  9                         |  +15 V                |  100 mA            | See note below.                                                | 
-|  6  |  +15V  |  100mA  | See note below. |+|  4           |  6 and 7                   |  +5 V                 |  1.5 A / 2.5 A     | 2.5 A max with Doppler subtraction option, 1.5 A max without.  | 
 +|  5           |                            |  No Connect           |                    |                                                                | 
 +|  6           |  1 and 2                   |  +5 V Ground          |                    | Return path for high current +5V.                              | 
 +</tabcaption></WRAP>
  
-<wrap lo>**Note:** See D2-005 manual for pin out on D-Sub 9-pin connector.</wrap> 
-</WRAP> 
 **Signal Output (SMA)** **Signal Output (SMA)**
  
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 The extent of the trim range can be determined by probing the location shown in <imgref trimpots2> with a voltmeter referenced to case ground (the outer shell of the SMA connector is a good reference point). Probing this location gives the wiper voltage of the trimpot which corresponds to temperature as shown in the table below. This 10-turn trim pot sets temperature from 15°C (fully CCW) to 75°C (10 turns CW).  The 5-turn point is approximately 42°C. The following table gives approximate temperature settings for the three available alkali options: The extent of the trim range can be determined by probing the location shown in <imgref trimpots2> with a voltmeter referenced to case ground (the outer shell of the SMA connector is a good reference point). Probing this location gives the wiper voltage of the trimpot which corresponds to temperature as shown in the table below. This 10-turn trim pot sets temperature from 15°C (fully CCW) to 75°C (10 turns CW).  The 5-turn point is approximately 42°C. The following table gives approximate temperature settings for the three available alkali options:
-<WRAP center round box 300px>+<WRAP center round box 300px><tabcaption temperature>
 ^ Alkali ^  Turns CW  ^  Wiper Voltage  ^  Temp  ^ ^ Alkali ^  Turns CW  ^  Wiper Voltage  ^  Temp  ^
 | cesium |  2  |  6.8V  |  ~30°C  | | cesium |  2  |  6.8V  |  ~30°C  |
 | rubidium |  4-5  |  5.7V  |  ~40°C  | | rubidium |  4-5  |  5.7V  |  ~40°C  |
 | potassium |  8-9  |  3.9V  |  ~60°C  | | potassium |  8-9  |  3.9V  |  ~60°C  |
-</WRAP>+</tabcaption></WRAP>
  
 **Window Offset Adjustment** **Window Offset Adjustment**
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   - View the output of the servo Error Input monitor on an oscilloscope in DC coupled mode.   - View the output of the servo Error Input monitor on an oscilloscope in DC coupled mode.
   - Turn on the laser and ensure it isn't on transition. We are going to ensure the photodetector in the D2-212 isn't saturated by checking its DC level on the oscilloscope.   - Turn on the laser and ensure it isn't on transition. We are going to ensure the photodetector in the D2-212 isn't saturated by checking its DC level on the oscilloscope.
-  - Adjust the λ/2 waveplate on the front of the D2-212 to attenuate the input signal until the DC level on the scope of the Error Input monitor is below 3V. If the DC level is higher than this, the photodetector circuitry may saturated and show erratic behavior.+  - Adjust the λ/2 waveplate on the front of the D2-212 to attenuate the input signal until the DC level on the scope of the Error Input monitor is below 3V. If the DC level is higher than this, the photodetector circuitry may saturate and show erratic behavior.
   - The module should now be set up for spectroscopy.    - The module should now be set up for spectroscopy. 
 =====Troubleshooting===== =====Troubleshooting=====
-==== Rubidium on Vapor Cell Windows ====+==== Metal Atoms on Vapor Cell Windows ====
 TBD TBD
 ==== Polarization Sensitivity==== ==== Polarization Sensitivity====
d2/spectroscopy_module_212.1417566761.txt.gz · Last modified: 2021/08/26 14:26 (external edit)