Fiber-coupling-operated orthogonal-linear-polarization Nd:YAG microchip laser: photothermal beat-frequency stabilization and interferometric displacement measurement application

Author

Yoshino, Toshihiko ; Kawata, Mitsuhiro ; Qimude, Bou ; Hayashi, Michiaki ; Takahashi, Yoshitaka

Author_Institution

Dept. of Electron. Eng., Gunma Univ., Japan

Volume

16

Issue

3

fYear

1998

fDate

3/1/1998 12:00:00 AM

Firstpage

453

Lastpage

458

Abstract

The Nd³⁺:YAG microchip laser is operated at orthogonal-linear-polarized two frequencies (λ=1.06 μm). A low crosstalk of 10^-4 is accomplished by means of the fiber-coupled laser diode pumping. The effect of another fiber-coupled laser diode irradiation on the beat frequency is investigated in terms of photothermally induced stress. The beat frequency of typically 100 MHz is stabilized within ±1 MHz by means of the photothermal feedback control of the cavity stress. The utility of the laser in heterodyne interferometric displacement measurement with a good linearity and high resolution is demonstrated

Keywords

displacement measurement; laser cavity resonators; laser feedback; laser frequency stability; light interferometry; light polarisation; measurement by laser beam; measurement errors; neodymium; optical crosstalk; optical fibre couplers; photothermal effects; solid lasers; 1.06 mum; Nd³⁺:YAG microchip laser; YAG:Nd; YAl5O12:Nd; beat frequency; cavity stress; fiber-coupled laser diode irradiation; fiber-coupled laser diode pumping; fiber-coupling-operated orthogonal-linear-polarization Nd:YAG microchip laser; good linearity; heterodyne interferometric displacement measurement; high resolution; interferometric displacement measurement application; low crosstalk; orthogonal-linear-polarized; photothermal beat-frequency stabilization; photothermal feedback control; photothermally induced stress; Crosstalk; Diode lasers; Feedback control; Fiber lasers; Frequency; Laser excitation; Microchip lasers; Neodymium; Pump lasers; Stress;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.661375

Filename

661375