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1. WO1996004702 - LASER STABILIZATION AND TUNING WITH WEDGED ETALON

Publication Number WO/1996/004702
Publication Date 15.02.1996
International Application No. PCT/US1995/009258
International Filing Date 24.07.1995
IPC
H01S 3/137 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13Stabilisation of laser output parameters, e.g. frequency, amplitude
136by controlling a device placed within the cavity
137for stabilising of frequency
H01S 3/139 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13Stabilisation of laser output parameters, e.g. frequency, amplitude
139by controlling the mutual position or the reflecting properties of the reflectors of the cavity
CPC
H01S 3/137
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13Stabilisation of laser output parameters, e.g. frequency, amplitude
136by controlling a device placed within the cavity
137for stabilising of frequency
H01S 3/1392
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
10Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
13Stabilisation of laser output parameters, e.g. frequency, amplitude
139by controlling the mutual position or the reflecting properties of the reflectors of the cavity ; , e.g. by controlling the cavity length
1392by using a passive reference, e.g. absorption cell
Applicants
  • LITTON SYSTEMS, INC. [US/US]; 360 N. Crescent Drive Beverly Hills, CA 90210-4867, US
Inventors
  • HALL, David, B.; US
Agents
  • KLEIN, Howard, J. ; Klein & Szekeres Suite 700 4199 Campus Drive Irvine, CA 92715, US
Priority Data
08/285,03129.07.1994US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) LASER STABILIZATION AND TUNING WITH WEDGED ETALON
(FR) STABILISATION ET SYNTONISATION LASER PAR UN ETALON A SECTION TRONCONIQUE
Abstract
(EN)
The wavelength of a light source (e.g., laser) is stabilized by introducing a collimated beam from the source into a 'wedged' etalon, i.e., an etalon having a Fabry-Perot cavity that continuously decreases in width along at least one axis that is normal to the axis of beam propagation. A pair of photodetectors at the output side of the etalon detect respective portions of the beam traversing different cavity widths. The respective output signals of the photodetectors are employed in a feedback loop, whereby the wavelength of the light source is controlled so as to minimize the amplitude difference between the two photodetector signals. The wavelength of the light source can be tuned by varying the ratio of the amplitudes of the photodetector output signals. The wedged etalon can also be used as a multi-channel optical receiver, wherein a multi-wavelength collimated incident beam is introduced into the etalon. An array of photodetectors is disposed at the output side of the etalon, each located at a position corresponding to a different cavity width, so that each photodetector receives one of the component wavelengths of the incident beam.
(FR)
On stabilise la longueur d'onde d'une source lumineuse (p. ex. un laser) en introduisant un faisceau collimaté en provenance de la source dans un étalon 'à section tronconique', c.à-d. un étalon ayant une cavité Fabry-Perot qui va diminuant de largeur le long d'au moins un axe parallèle à l'axe de propagation du faisceau. Une paire de photodétecteurs placés du côté de la sortie de l'étalon détectent les parties respectives du faisceau traversant différentes largeurs de la cavité. Les signaux de sortie respectifs des photodétecteurs sont employés dans une boucle de réaction où la longueur d'onde de la source lumineuse est régulée de façon à réduire la différence d'intensité entre les signaux des deux photodétecteurs. On peut accorder la longueur d'onde de la source lumineuse en faisant varier le rapport d'intensités des signaux de sortie des photodétecteurs. L'étalon à section tronconique peut également être utilisé comme récepteur optique multivoie, le faisceau incident collimaté à longueurs d'ondes multiples étant introduit dans l'étalon. Un ensemble de photodétecteurs est placé du côté de la sortie de l'étalon, chacun se trouvant à une position correspondant à une largeur de cavité différente de sorte que chaque photodétecteur reçoive une des longueurs d'ondes composantes du faisceau incident.
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