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Entry   1GHz oscillator Frep measurement, posted by Blanc at Optical room about mechanics | lasers and optics | detectors and electronics 
    Reply   1GHz oscillator Frep measurement, posted by Blanc at Optical room about mechanics | lasers and optics | detectors and electronics Spectre_GHz-3.PNG
Message ID: 23     Entry time: Fri Oct 1 16:55:47 2021     Reply to this: 39
 Author: Blanc 
 Status: Fixed 
 Type: info 
 Category: mechanics | lasers and optics | detectors and electronics 
 Location: Optical room 
 Title: 1GHz oscillator Frep measurement 
a previous cavity FSR measurement was giving a center frequency around 867.5MHz. the present 1GHz oscillator Frep measurement is about 879.888MHz. the present shift is about 12.4MHz which is equivalent to move one cavity lenght by 4.3mm which is HUGE !!! as the 1GHz oscillator does not have any motor, one has to move the FP cavity mirrors instead. the PZT inside the 1GHz oscillator (Thorlabs PC4QR) has a dynamic range of (20µm for 150V... we will drive it with 10V) 1.3µm. then, we will have to adjust the FP cavity FSR with an accuracy much better than 4kHz (the cavity linewidth is 500kHz !!!)
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