Coherent light generators – Particular beam control device – Optical output stabilization
Patent
1996-03-06
1997-09-16
Healy, Brian
Coherent light generators
Particular beam control device
Optical output stabilization
372 12, 372 29, 372 43, 372109, 385 12, 385 33, 385 93, 356345, 359180, 359188, H01S 313, G02B 600, G01B 902, H04B 1004
Patent
active
056688261
ABSTRACT:
The laser diode (11) of the electro-optical device (10) is frequency-controlled with the aid of a control module (40) comprising a rubidium cell (41) and an optical sensor (42), as well as a further module (43) for controlling the injection current and/or the temperature of the laser diode. A controlling light beam (18) is conveyed by means of a multi-mode optical fiber (14) to the rubidium cell. The optical sensor measures the intensity of the light beam transmitted by the rubidium cell and supplies a signal used by the further module for regulating the injection current and/or the temperature of the laser diode so as to stabilize the frequency of the light (16) emitted. The optical fiber is coupled to the laser module in such a way as to collect part of the light (16, 21) emitted by the front face of the laser diode and reflected by a lens (12) in front of the laser diode. The diode-lens assembly is heat controlled. Feedback in the laser diode and the power supplied to the laser diode are reduced, and the control device is simplified. The device finds application particularly in interferometry, atomic frequency oscillators, spectroscopy, and fiber optics data transmission.
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Bezinge Alex
Jornod Alain
Moser Christophe
Thomann Pierre
Healy Brian
Tesa Brown & Sharpe SA
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