The reason I suspect that the beat note should not be broad linewidth (~100 MHz), as I see in the spectrum analyzer, is because, using those same lasers, we can create a magneto-optical trap. Therefore, the laser's linewidth should be less than 5 MHz (Cs D2 natural linewidth).
What is that I am doing wrong? What parameters should I check to mitigate this noise?
Thanks.
Hi Vincent Lecoeuche
Thanks for your reply.
I am attaching the spectrum analyzer plot.
"...saturated your analyzer with too much RF."
>> I don't think RF power is saturated because peak power is less than -30 dBm.
#-------- Few Parameters --------#
RBW = 3 MHz
Sweep time = 20 ms
You may have to look at the picture I attached for more parameters.
The plateau was pretty much stable for short term (10-20 minutes)
"Are your two lasers locked to two different transitions?"
>> To test the beat note setup, two lasers were mode-locked around 800 MHz apart. Not a specific transition was chosen.
"...could it be a wander of your two lasers during the scanning time of your analyzer."
>> Agree.
Strangely, we didn't turn on the current modulation for any of our lasers, and the piezo was servo-locked. Therefore, I don't understand how the laser peak shifts so fast.
Does the laser current supply's noise amount to this behavior? Or is the PID messing with the piezo?
Thanks.
İki lazer arasında bir vuruş notası gözlemlemek için enerji oluşması gerekiyor. Bu durum plaka depremlerinde enerji boşalması sırasında meydana gelebilir. İki düz plakanın hareketi esnasında büyük bir alanı etkiler. Ortaya çıkan enerji, ışık ve radyasyon şeklinde açığa çıkar. Duyulan sesler ise notadır. Sonuç olarak iki lazer kaynağı arasında geniş bir platonun oluşmasının ana nedeni enerji ve bununla frekans, dalga boyu, kırıcılık indisi, salınım, periyot, zaman vb. Değişkenlerin farklılık göstermesi olabilir. Buna örnek olarak Türkiye'deki 6 şubat depremini inceleyebilirsiniz.
Hi Şükrü Aktaş
Thanks for your answer. Can you please translate it into English?
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