Coherent light generators – Particular beam control device – Mode locking
Patent
1990-04-24
1991-08-13
Gonzalez, Frank
Coherent light generators
Particular beam control device
Mode locking
372 97, 372 25, H01S 3098
Patent
active
050401823
ABSTRACT:
Mode-locked pulsed output is induced in a laser by introducing a varying frequency dependent loss in the cavity. The varying, frequency dependent loss allows a large number of longitudinal modes to oscillate. In one of the preferred embodiments of the subject invention, the varying frequency dependent loss is generated by reciprocating one of the mirrors of the resonator. In this embodiment, the laser has a resonator with a primary light path defined by first and second end mirrors. A gain medium is located between the end mirrors. A beam splitter is provided for redirecting the light into a secondary light path. A third mirror functions to feed back the light into the primary light path. Pulse formation is induced by varying the path length of one of the two paths by reciprocating an end mirror. Moving the mirror creates varying interference effects when the light energy is recombined at the beam splitter. The mirror is reciprocated relatively slowly, yet ultra-short pulses are generated.
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patent: 3651424 (1972-03-01), Ueno et al.
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patent: 4174504 (1979-11-01), Chenausky
patent: 4302730 (1981-11-01), Jernigan
"Phase Locking of Laser Modes by Continuous Cavity Length Variation", P. W. Smith, Applied Physics Letters, vol. 10, No. 2, Jan. 15, 1967.
"Ti:sapphire Laser Emits ps Pulses", Brian Dance, Laser Focus, Jan. 1990.
"Mode Locking of a Continuous-Wave Titanium-Doped Sapphire Laser Using a Linear External Cavity", French et al., Optics Letters, vol. 15, No. 7, received Oct. 27, 1989, published Apr. 1, 1990.
Couillaud Bernard J.
Feugnet Gilles A.
Spinelli Luis A.
Coherent Inc.
Gonzalez Frank
Morse Susan S.
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