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Old Dec 18th 2018, 09:20 AM   #1
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Join Date: Dec 2018
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Modulating Laser frequency using AOM double pass

I don't know if this is the right place for my question, but we will see

I want to modulate the frequency of a stabilized HeNe-laser using an AOM double pass. I can tune the frequency of the AOM from 150 MHz to 230 MHz. The center frequency is at 200 MHz, where I get about 85% transmission to the first order.
My problem is now, that the achieved bandwith is much too small. The single pass bandwidth (FWHM) is about 25 MHz, it should be at least 50 MHz. As you can imagine, the double pass bandwidth is not better at all. So I guess that I am doing something wrong. I already tried alternating the beam width by putting a telescope in front of the AOM. The result is a larger bandwith, but also a lower center diffraction efficiency (only about 50-60% at 200 MHz).
Has anybody an idea what I could be doing wrong? It should be pretty easy in theory. I appreciate any kind of advice, thanks in advance!

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