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David Notebook: Difference between revisions
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→780 Laser Notes
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Specified maximum rating is 3 amps of input current when seeded, but should be able to output 1W with 2 amps.
There should be about 2 mW of power going into the TA, although 5-10 mW should be fine
'''5/20/14''' Seed laser for the TA was very multi-mode. We eventually tracked the issue down to feedback from ASE due to the TA. Tuned the isolator and brought feedback down from a few hundred μW to about 20 μW, and the seed laser is now very stable. It should be possible to reduce this further with additional tuning, but it doesn't seem necesary at this point. We also reduced the TA current from 2000 mA to 1800 mA to reduce ASE, and had to increase the seed power. Seed current is now at 70 mA and the waveplate was adjusted to give about 6 mW to the TA.
'''5/19/14''' Having difficulty seeing 633 nm generation from the 780 TA beam, but realized that the TA can actually take more current than we previously thought. Increased current to 2 amps and adjusted waveplate to give about 3.3 mW of seed power. Current for the seed is still at 65 mA. Output from the TA increased from about 500 mW to 1000 mW.
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