Differences

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--- d2:laser_controller [2019/07/25 17:11] – Michael Radunsky
+++ d2:laser_controller [2019/10/23 21:56] – Michael Radunsky
@@ Line 14: / Line 14: @@
 [[http://www.vescent.com/products/electronics/d2-105-laser-controller/|D2-105 web page]]
-=====Description:=====
+===== Description: =====
 The laser controller has two temperature controllers capable of sub-mK stability(( Sub-mK stability requires a proper thermal design and proper tuning of the temperature controller to the thermal plant. If you did not purchase a D2-100 Diode Laser with your Laser Controller, please read the section on tuning the temperature controller.)) and a 200 mA or 500 mA precision current source based on the Libbrecht-Hall(( Libbrecht and Hall, A Low-Noise, High-Speed Current Controller, Rev. Sci. Inst. 64, pp. 2133-2135 (1993).)) circuit.  The laser controller is designed for very fast current modulation via the servo input enabling high-speed servo control of the laser's frequency.  The current servo input can accommodate input frequencies over 10 MHz and is limited by  the 1 kΩ input impedance. Additionally, an RF port is available for higher frequency modulation.
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-=====Purchase Includes:=====
+===== Purchase Includes: =====
 <WRAP group>
 <WRAP half column>
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   - Turn on temperature loop.
   - Adjust set-point to approximately desired temperature.
-  - Turn up the gain. Keep increasing the gain until the temperature error (front panel BNC) just start to oscillate or ring with very little damping. If oscillation too large, reduce gain. Measure the period of oscillation.
+  - Turn up the gain. Keep increasing the gain until the temperature error (front panel BNC) just starts to oscillate or ring with very little damping. If oscillation too large, reduce gain. Measure the period of oscillation.
   - Turn off the Laser Controller. Measure resistance between "GAIN" testpoint and "GND" testpoint.  Turn down the "PROPGRAIN" until this resistance reads 1.7 times less than its original value (i.e. from 500Ω to 295Ω).
   - Take the measured oscillation period in step 6 and divide by two. Set the Integrator time constant to this value. For instance, if you measured a period of oscillation of 14 seconds, turn on the 4<sup>th</sup> (2.2s) and 5<sup>th</sup> (4.7s) switches in the integrator bank, to get a time constant of 6.9s.