Laser control apparatus and method for frequency offset phase locking and the minimizing of retro-reflection effects
Patent
·
OSTI ID:6265886
This patent describes improvement in a laser control apparatus including an active laser, a reference laser, means for phase locking the radiation output of the active laser to the radiation output of the reference laser with a relative frequency offset. The improvement in the laser control apparatus comprises: the means for phase locking including means for heterodyning the radiation outputs of the lasers to produce a light heat frequency, means for generating an active frequency electric signal as a function of the light beam frequency means for generating a reference offset frequency electric signal, and a phase comparator means having electric circuitry means for sensing changes in phase between two electric signals and coupled to the means for generating the active frequency electric signal and the means for generating the reference offset frequency electric signal, the phase comparator electric circuitry means providing an output electric signal as a result of changes in phase between the active frequency electric signal and the reference offset frequency electric signal.
- Assignee:
- NOV; EDB-92-012157; NOV-91-025007
- Patent Number(s):
- A; US 5018151
- Application Number:
- PPN: US 7-645803
- OSTI ID:
- 6265886
- Country of Publication:
- United States
- Language:
- English
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