Differences
This shows you the differences between two versions of the page.
| Both sides previous revisionPrevious revision | Next revisionBoth sides next revision |
| d2:quick_start_opls [2017/08/04 15:35] – [D2-135 Locking] Michael Radunsky | d2:quick_start_opls [2018/06/06 23:07] – [D2-135 Locking] Michael Radunsky |
|---|
| Getting a phase lock can be tricky, as the servo feedback must be pretty well optimized to your laser to get a phase lock. The narrower the linewidth of the laser and the higher the bandwidth of the laser, the easier it is to get a phase lock. The first step is to get an error signal with a steep slope at the desired offset frequency and then a basic lock. | Getting a phase lock can be tricky, as the servo feedback must be pretty well optimized to your laser to get a phase lock. The narrower the linewidth of the laser and the higher the bandwidth of the laser, the easier it is to get a phase lock. The first step is to get an error signal with a steep slope at the desired offset frequency and then a basic lock. |
| |
| Connect the D2-135's Servo Out to the Servo In on your Laser Controller to sweep the slave laser's frequency. (Refer to <imgref image1> for making electrical connections to the D2-135.) Connect the Ramp TTL on the D2-135 to the trigger on your O-scope and view the Error In Monitor to the O-scope. Set the D2-135 to N=16, VCO Low mode, put the Servo in Ramp mode and by tweaking the laser current, you should see the Error In Monitor look something like what is shown in <imgref error_signal>.<WRAP left round box 450px><imgcaption error_signal|Sample Error Signal when sweeping one laser. Reflection point shown in blue, two lock point shown in red.>{{:d2:quick_start_opls:opls-sweep-figure.png?direct&400 |}}</imgcaption></WRAP> | Connect the D2-135's Servo Out to the Servo In on your Laser Controller to sweep the slave laser's frequency. (Refer to <imgref image1> for making electrical connections to the D2-135.) Connect the Ramp TTL on the D2-135 to the trigger on your O-scope and view the Error In Monitor to the O-scope. Set the D2-135 to N=16, VCO Low mode, put the Servo in Ramp mode and by tweaking the laser current, you should see the Error In Monitor look something like what is shown in <imgref error_signal>.<WRAP left round box 450px><imgcaption error_signal|Sample Error Signal when sweeping one laser. Reflection point is shown in blue, two lock points are shown in red.>{{:d2:quick_start_opls:opls-sweep-figure.png?direct&400 |}}</imgcaption></WRAP> |
| |
| |
