Title:
WAVELENGTH VARIABLE OPTICAL FILTER, LASER APPARATUS AND METHOD FOR STABILIZING LASER WAVELENGTH
Document Type and Number:
Japanese Patent JP3690587
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To constantly and accurately detect the shift of a target wavelength to realize stable wavelength lock without being affected by the variation in the light output intensity of a laser beam source.
SOLUTION: Two Fabry-perot resonators, in which transmission center wavelengths are different and the difference between the lengths of resonators are adjusted so that transmissions are equal within a range of 0.1-0.9 at an intermediate wavelength equally spaced from two transmission center wavelengths, are constructed by using a parallel flat base plates 7 having a step 7 and high reflectance layers 8 and 9 on both sides. An incident light is branched into two parts with a directional coupler 3 and the lights are incident one by one. The plate 7 rotates on a rotation stage 6 on which the plate 7 is arranged to control the lengths of the resonators, thereby varying the wavelength.
Inventors:
Yoshimasa Katagiri
Etsu Hashimoto
Etsu Hashimoto
Application Number:
JP2001026727A
Publication Date:
August 31, 2005
Filing Date:
February 02, 2001
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G02B26/00; G02B5/28; H01S3/131; (IPC1-7): H01S3/131; G02B5/28; G02B26/00
Domestic Patent References:
| JP9064449A | ||||
| JP2001015856A | ||||
| JP7058393A |
Attorney, Agent or Firm:
Hiroshi Matsumoto
Toshiro Mitsuishi
Yasuyuki Tanaka
Toshiro Mitsuishi
Yasuyuki Tanaka