Laser Frequency Comb
- Steve Gibson
- Bradford Holden (Unlicensed)
Table of Contents:
Introduction
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,
Relevant Devices
Description | Qty | Source | Part Number |
|---|---|---|---|
Menlo Laser Frequency Comb |
|
|
|
Relevant Functional Block Diagram
Note the LFC computer will sit on the Keck ‘ops’ network at the summit, not the KPF private network.
Relevant Datasheets & Manuals
Relevant Software
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.
Dispatcher
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 |