Table of Contents:
The Laser Frequency Comb (LFC) is a ‘black box’ system purchased from Menlo Systems. It provided a high-line density calibration source for KPF that offers high wavelength stability,
Description | Qty | Source | Part Number |
|---|---|---|---|
Menlo Laser Frequency Comb |
Note the LFC computer will sit on the Keck ‘ops’ network at the summit, not the KPF private network.
The Menlo LFC uses websockets to communicate with other processes.
Menlo has written an API layer in Python that has two requirements:
Menlo also suggests that you can use
with pywebchannel but you have to roll your own interface.
Keyword | Value | Type |
|---|---|---|
AMPLIFETIME | 22.004 sec | Float |
DEVICE(#) | Menlo LFC - device name AstroComb_AU06112 | String |
PCFSERIAL | ####### - serial number of PCF | String |
OPERATIONMODE | 0 - AstroComb (or On) 1 - StandbyHi (preferred when not in use) 2 - StandbyLow 3 - Off 4 - Manual | Enumerated Values 2 through 4 are NOT writeable. |
IRFLUX | 13451234 | Integer - no units |
VISFLUX | 12341234 | Integer - no units |
OFFSETFREQ | 135928345 Hz | Double |
LFCCEOFR | -30000000.00 Hz CEO filtered setpoint | Double |
LFCCWFERR | 34412342 Hz CW frequency error | Double |
LFCCWFREF | -30000000 Hz CW reference frequency | Double |
LFCCWFREQ | 288005504412342 Hz CW frequency | Double |
LFCCWMDN | 0 | Integer |
LFCF0 | 250000163.02 Hz LFC filtered offset frequency | Double |
LFCFOREF | 250000000.00 Hz LFC filtered offset freq ref | Double |
LFCFRR | 20000013041.2758 Hz LFC Filtered Rep Rate | Double |
LFCFRREF | 20000000000.0000 Hz LFC Filtered Rate Ref | Double |