Coherent light generators – Particular beam control device – Mode locking
Patent
1991-06-19
1993-02-09
Scott, Jr., Leon
Coherent light generators
Particular beam control device
Mode locking
372 20, 372 98, 372107, 372 33, 372 94, H01S 3098
Patent
active
051857502
ABSTRACT:
A mode locked pulsed laser incorporates an intracavity element to compensate for the dispersion caused by other intracavity elements. This element reduces the tendency of the pulse to broaden in the cavity due to group velocity dispersion and results in very short pulses. In the laser of the present invention, mode locking is initiated by detecting the beat frequency between adjacent longitudinal modes using a high speed photodiode. This signal is amplified and then the frequency is divided by two. The signal is passed through an electronically adjustable phase shifter and then to a power amplifier. This signal is applied to the acousto-optic modelocker. If the cavity length drifts the beat frequency between the longitudinal modes changes. The rf signal applied to the modulator changes in exactly the right manner to track the drift in cavity length. Thus the modelocker is automatically synched to the round trip of the laser cavity.
REFERENCES:
patent: 3581128 (1971-05-01), Smith
patent: 3675154 (1972-07-01), Duguay et al.
patent: 3679313 (1972-07-01), Rosenberg
patent: 3696310 (1972-10-01), Paoli et al.
patent: 4928282 (1990-05-01), Barthelemy et al.
Baer Thomas M.
Kafka James D.
Keirstead Mark S.
Schaaf Horst W.
Watts Michael L.
D'Alessandro Kenneth
Jr. Leon Scott
Spectra-Physics Lasers Incorporated
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