bberkeyU
commented
2 months ago subversion:\HAO-IG\UCOMP\Integration and Testing\Tuning\Analysis\make_ucomp_cal_file.pro The program that maps the random lyot filter tunings in the lab a phase-> voltage lookup table that the realtime code uses to drive the LCVR voltage, computes a period for each of the stages. The period for stage0 (the thinnest crystal/widest cosine envelope) should be the FSR of the instrument if everything is working correctly.
This code finds the 1074.7 FSR/period to be 5.1271543 1074.7 tuning file
There is some concern that we have multiple answers for the UCoMP lyot filter Free Spectral Range (FSR) and, therefore, continuum spacing, which is FSR/4.
Checking Google Drive, I found documents called: Line List.xlsx UCoMP Line List.xlsx Line List.xlxs Which have FSR of 5.03 and 5.025 for 1074.
In subversion: Integration and Testing\Tuning\filter.txt Shows 1074 FSR as 5.025 Integration and Testing\Wavelength Calibration\UCoMP_Trans.pro Defines the 1074 FSR as 4.970
I don't know where the 4.970 values come from; they have been in UCoMP_Trans since I first checked them into Subversion.
The 5.025 values come from Phil Oakley and Steve's work in 2014.
Answer: The original numbers were based on physical measurements of the LiNbO crystals and the theoretical index of refraction. We measured the actual FSR in the tuning fits. The best-known FSR values are the stage periods from the tuning files. With the continuum offsets FSR/4.