LASER DEVICE

PURPOSE:To enable the high-accuracy adjustment of a wave-length which permits etalon to transmit by projecting a light from a light source into the etalon and controlling a wavelength which permits the etalon to transmit based on a strength of a reflected light from a reflecting plane of the etalon....

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Bibliographic Details
Main Author WAKATA HITOSHI
Format Patent
LanguageEnglish
Published 30.10.1991
Subjects
BASIC ELECTRIC ELEMENTS
DEVICES USING STIMULATED EMISSION
ELECTRICITY
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Summary:PURPOSE:To enable the high-accuracy adjustment of a wave-length which permits etalon to transmit by projecting a light from a light source into the etalon and controlling a wavelength which permits the etalon to transmit based on a strength of a reflected light from a reflecting plane of the etalon. CONSTITUTION:A part of a laser beam 29a from an He-Ne laser 26 which has transmitted through a beam splitter 27 passes through a total reflecting mirror 3 and enters into a etalon for rough adjustment 5, and then it is reflected by a reflecting plane of the etalon. Then, an intensity of the reflected light is detected by a light sensor 30. Meanwhile, a part of laser beam 29b which has been splitted by the splitter 27 is irradiated with the etalon 5 and is reflected by its reflecting plane. An intensity of that reflected light is detected by a light sensor 30b. The outputs of the sensors 30a and 30b are introduced to a control mechanism 31 and a gap length of the etalon 5 or its angle to a beam 7 are modulated so as to make an output difference between the sensors 30a and 30b zero. As a result, the center transmission wavelength of the etalon 5 becomes a predetermined wavelength.
Bibliography:Application Number: JP19900041585