Josh Notebook: Difference between revisions
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'''5/14/2014''' |
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The 1064 laser is still not behaving very well. David also thought that it was behaving weird and was hard to couple to the cavity. We proceeded anyway. |
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We saw pretty solid solo 1064 generated spectra. Our OSA isn't working (it can't see low power stuff), but with Saffman's OSA we easily saw 807 and up to 5 (maybe 8?) rotational Stokes sidebands off of 807. We also could see many rotational sidebands off of 1064, and we saw 1555 and one rotational Stokes beam off of that. |
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We also saw all of these sidebands (except the 1555's rotational Stokes) using the IR viewer after a prism. For the most part, the beams all looked like well-defined gaussians. |
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We installed a removable magnetic mirror in the path of the 807 that is transmitted through the dichroic coupling mirror. We have it so that without the mirror, it goes to a fiber coupler to the OSA, and with the mirror we can send it to a prism for visual searching. |
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The dichroic coupling mirrors seem like a great idea; we are considering removing the prism that we use with the 1064 reflected signal because the dichroic works so much better and it's easier. |
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'''5/13/2014''' |
'''5/13/2014''' |
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Revision as of 23:23, 14 May 2014
5/14/2014
The 1064 laser is still not behaving very well. David also thought that it was behaving weird and was hard to couple to the cavity. We proceeded anyway.
We saw pretty solid solo 1064 generated spectra. Our OSA isn't working (it can't see low power stuff), but with Saffman's OSA we easily saw 807 and up to 5 (maybe 8?) rotational Stokes sidebands off of 807. We also could see many rotational sidebands off of 1064, and we saw 1555 and one rotational Stokes beam off of that.
We also saw all of these sidebands (except the 1555's rotational Stokes) using the IR viewer after a prism. For the most part, the beams all looked like well-defined gaussians.
We installed a removable magnetic mirror in the path of the 807 that is transmitted through the dichroic coupling mirror. We have it so that without the mirror, it goes to a fiber coupler to the OSA, and with the mirror we can send it to a prism for visual searching.
The dichroic coupling mirrors seem like a great idea; we are considering removing the prism that we use with the 1064 reflected signal because the dichroic works so much better and it's easier.
5/13/2014
More 1064 laser problems today. Can't quite describe problem. The cavity peaks (without modulation) are very sensitive to cavity piezo position. Something doesn't look right about the peaks. They almost look like the laser is multimode, but checking with the OSA, it doesn't appear to be. I'm not sure what the problem is. I had a ton of trouble getting the peaks to be single mode, and when I did, it wasn't a very stable single mode. A slight change in the cavity piezo or in the alignment made a bigger-than-normal difference in the single-modeness.
5/12/2014
Today I discovered the internet.
Also, I aligned the 807 (anti-Stokes from 1064) that goes through the dichroic mirror on the 1064 side. It is now coupled to a multimode fiber that we can send to the OSA. The laser was behaving pretty weirdly, so it's only kind-of aligned. (The resonant peaks were extremely sensitive to the piezo positions, and there were many multimode regions.) This was done using the old (home-made) locking circuits with only the fast modulation on (laser flashing).