Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1987-09-09
1989-03-28
Sikes, William L.
Coherent light generators
Particular beam control device
Optical output stabilization
372 28, 372 30, 330 43, 332 751, H01S 313
Patent
active
048170992
ABSTRACT:
A system for generating a stable optical frequency from a laser signal having inherent frequency fluctuations. The signal from a injection-controlled pulsed laser is divided into two parts. One part is mixed with the signal from a stable CW laser to generate beat frequencies. These signals are amplified and recombined with the pulsed laser signal in an output modulator. In one embodiment, the difference frequency between the pulsed laser and the reference signal is less than 1000 MHz. The beat frequencies are increased by an X-band mixer to the microwave range where they can be readily amplified in an available broad band amplifier. In another embodiment, the transmitter laser and the reference laser operate at a different frequency in the micorwave range, say, above 5,000 MHz. The beat frequencies are obtained by a high frequency mixer such as a bulk crystal in a waveguide or cavity. In still another embodiment, two independent transmitter lasers generate pulses that occur with a significant time delay. These two signals are combined, amplified and mixed to obtain the desired sideband signals. The subsequent corrective modulation elimintes the frequency fluctuations in each pulse and results in coherent time-delayed pulses.
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Laser Science, Inc.
Sikes William L.
Thi Vo Xuan
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