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| d2:quick_start_opls [2019/03/08 18:22] – Michael Radunsky | d2:quick_start_opls [2019/03/08 18:24] – [D2-250 or D2-150 Alignment] Michael Radunsky |
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| <WRAP right round box 450px><imgcaption image1|Initial electrical connections to D2-135. (As shown for D2-135-SMA. For D2-135-FC, connect optical output of D2-150 or D2-250 directly to SC fiber input on face of D2-135.)>{{:d2:quick_start_opls:d2-135_connections.jpg?direct&400 |}}</imgcaption></WRAP> | <WRAP right round box 450px><imgcaption image1|Initial electrical connections to D2-135. (As shown for D2-135-SMA. For D2-135-FC, connect optical output of D2-150 or D2-250 directly to SC fiber input on face of D2-135.)>{{:d2:quick_start_opls:d2-135_connections.jpg?direct&400 |}}</imgcaption></WRAP> |
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| Plug the fiber into either the D2-160 or D2-135-FC (obsolete). If using the D2-160, use a short RF SMA cable to connect the D2-160 to the D2-135-SMA. Look at the D2-135's Beat Note div/2 monitor on a spectrum analyzer. You should see a beat note at half the frequency difference between the two lasers. You may need to tweak the laser current on one laser to make sure the frequency difference is in range. Once you see a beat note, adjust the laser frequency until the beat note starts to broaden or disappear. When that happens, park the laser where the beat note starts to degrade and tweak the alignment of the 3 beam splitters until the beat note looks good. Repeat until you have the desired frequency range (typically ~10 GHz). | Plug the fiber into either the D2-160 or D2-135-FC (obsolete). If using the D2-160, use a short RF SMA cable to connect the D2-160 to the D2-135-SMA. Look at the D2-135's Beat Note div/2 monitor on a spectrum analyzer. You should see a beat note at half the frequency difference between the two lasers. You may need to tweak the laser current on one laser to make sure the frequency difference is in range. Once you see a beat note, adjust the laser frequency until the beat note starts to broaden or disappear. When that happens, park the laser where the beat note starts to degrade and tweak the alignment of the 3 beam splitters until the beat note looks good. Repeat until you have the desired frequency offset (typically up to ~10 GHz). |
| ===== D2-135 Locking ===== | ===== D2-135 Locking ===== |
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