Title:
NEAR-INFRARED LASER AND LASER GENERATION METHOD
Document Type and Number:
WIPO Patent Application WO/2020/056655
Kind Code:
A1
Abstract:
A near-infrared laser, comprising a front cavascope, a laser crystal, a Q-switched crystal, a quasi-phase-matched crystal, a wavelength selection crystal, and a rear cavascope. By applying an intracavity cascade frequency-doubled optical parametric oscillator (cSHG-OPO) method and utilizing quasi-phase-matching of a periodically poled crystal, a second-order nonlinear coefficient d 33 of a nonlinear crystal is utilized to the fullest extent. A cascade second-order nonlinear effect simulates a third-order nonlinear effect, and a similar third-order nonlinear wave mixing effect is produced around the pump wavelength so as to generate a wideband parametric gain; by means of a method for improving the fundamental frequency laser in a resonant cavity and the frequency-doubled optical power density, an intracavity parametric gain is significantly increased so as to decrease a threshold of parametric oscillation; an intracavity wavelength selection element is then used for generating a parametric oscillation laser output at the specific wavelength. The structure and the method in the present invention make the structure of a near-infrared laser in a broad wavelength range greatly simplified, and facilitate miniature and high efficiency of the laser.
Inventors:
XU QINGYANG (CN)
Application Number:
PCT/CN2018/106624
Publication Date:
March 26, 2020
Filing Date:
September 20, 2018
Export Citation:
Assignee:
YANTAI LONGCH TECH CO LTD (CN)
International Classes:
H01S3/108
Foreign References:
| CN104577700A | 2015-04-29 | |||
| CN101697397A | 2010-04-21 | |||
| US5787102A | 1998-07-28 |
Attorney, Agent or Firm:
YANTAI SHANGHE INTELLECTUAL PROPERTY AGENCY (GENERAL PARTNERSHIP) (CN)
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