Automatic dither stabilization of a laser cavity

Details Automatic dither stabilization of a laser cavity Automatic dither stabilization of a laser cavity

1989-05-17

1990-11-20

Sikes, William L.

Coherent light generators

Particular beam control device

Optical output stabilization

372 96, 372107, H01S 313

Patent

active

049724240

ABSTRACT:
A laser cavity (12) subject to temperature induced effective length change greater than the length of a single power signature cycle of the laser is automatically stabilized by a combined digital arrangement for finding and locking on a selected signature peak corresponding to an optimum laser cavity length, and then digitally tracking such optimum length so as to stabilize operation at such peak. A piezoelectric crystal transducer (26) mounts one of the cavity mirrors (24) and is driven to change effective cavity length, first in an acquire mode, and then in a tracking mode. In acquire mode, voltage on the piezoelectric crystal transducer (26) is increased in a step wise linear fashion from near zero to a near maximum displacement of the crystal. A gain curve peak (33,34,35) is identified by sampling output power (30) of the laser, and storing the maximum value of sampled power, together with a peak transducer driving voltage at which such power maximum occurs. In a tracking mode this peak driving voltage (126,143) is combined with a digitally generated triangle dither voltage (124,142) to dither (i.e. alternate) the cavity length between upper and lower limits on either side of the gain curve peak (122) that was identified in the acquire mode.

REFERENCES:
patent: 4798467 (1989-01-01), Wyeth et al.
patent: 4823354 (1989-04-01), Znotins et al.

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