Title:
波長掃引光源
Document Type and Number:
Japanese Patent JP6831774
Kind Code:
B2
Abstract:
To provide a wavelength sweeping light source realizing stable FDML operation by controlling the phase of the light propagating through a resonator according to resonator length change.SOLUTION: Reference light outputted from a laser light source 151 and modulated with a modulation frequency fis reflected on a dichroic mirror 155 and inputted from a fiber collimator 132 to a fiber ring. The reference light circulated the fiber ring is reflected on the dichroic mirror 155 and a polarization beam splitter 153 before entering a photodetector 156. When the optical path length of the fiber ring changes, intensity of the light of frequency f-, detected by the photodetector 156, also changes. A feedback controller 158 controls a fiber stretcher 180 so that the optical intensity of frequency fbecomes the reference intensity when the circulation cycle of the fiber ring matches the sweep period of a wavelength filter 130.SELECTED DRAWING: Figure 1
More Like This:
| JPH0945984 | TWO FREQUENCY LASER BEAM OSCILLATOR |
| JP5937999 | Nanosecond pulse light source |
| JP3619106 | SELF-COMPENSATING LASER RESONATOR |
Inventors:
Seiji Toyota
Masahiro Ueno
Chen Akira
Tadashi Sakamoto
Masahiro Ueno
Chen Akira
Tadashi Sakamoto
Application Number:
JP2017248380A
Publication Date:
February 17, 2021
Filing Date:
December 25, 2017
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
H01S3/107; G02F1/29; H01S3/137
Domestic Patent References:
| JP7288359A | ||||
| JP7015062A | ||||
| JP2010225688A | ||||
| JP2014126599A |
Foreign References:
| WO2005076422A1 | ||||
| US6643299 |
Attorney, Agent or Firm:
Patent Business Corporation Tani/Abe Patent Office