Wavelength beam combining of a laser diode array to get 20 W cw circle spot emission - Details

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Abstract：

Based　on　the　wavelength　beam　combining　technology,　we　use　the　diffraction　of　the　grating　and　the　feedback　of　the　external　cavity　to　lock　all　elements　of　a　laser　diode　array　(LDA)　on　different　wavelengths.　The　beam　quality　of　LDA　is　improved　and　a　near　parallel　output　is　produced　in　the　direction　of-1　order　diffraction　of　grating.　A　commercial　available　LDA　with　19　emitters　is　applied,　whose　size　is　about　1　cm.　The　period　of　the　LDA　is　500　μm　and　the　width　of　emitters　is　100　μm.　With　a　maximum　continuous　injection　current　of　60.6　A,　the　output　free　running　power　is　49.8　W,　and　a　steady　beam　combined　output　power　of　20.1　W　is　obtained.　The　width　of　spectrum　is　15　nm.　And　the　far-field　divergence　angle　is　reduced　from　70　mrad　to　1.66　mrad.　The　improved　bem　quality　Mx,y2is　about　32,　which　is　almost　equal　to　that　of　a　single　emitter.

Keyword：

Laser Doppler velocimeters Diodes Diffraction gratings Diffraction

Author Community：

[ 1 ] [Liu, Bo]College of Laser Engineering, Beijing University of Technology, Beijing 100022, China
[ 2 ] [Zhang, Xue]College of Laser Engineering, Beijing University of Technology, Beijing 100022, China
[ 3 ] [Hui, Yong-Ling]College of Laser Engineering, Beijing University of Technology, Beijing 100022, China
[ 4 ] [Han, Jun-Ting]College of Laser Engineering, Beijing University of Technology, Beijing 100022, China
[ 5 ] [Jiang, Meng-Hua]College of Laser Engineering, Beijing University of Technology, Beijing 100022, China
[ 6 ] [Pang, Kai]College of Laser Engineering, Beijing University of Technology, Beijing 100022, China
[ 7 ] [Li, Qiang]College of Laser Engineering, Beijing University of Technology, Beijing 100022, China