TITLE

High brightness laser source based on polarization coupling of two diode lasers with asymmetric feedback

AUTHOR(S)
Thestrup, Birgitte; Chi, Mingjun; Sass, Bjarne; Petersen, Paul Michael
PUB. DATE
February 2003
SOURCE
Applied Physics Letters;2/3/2003, Vol. 82 Issue 5, p680
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
In this letter, we show that polarization coupling and asymmetric diode-laser feedback can be used to combine two diode-laser beams with low spatial coherence into a single beam with high spatial coherence. The coupled laser source is based on two similar laser systems each consisting of a 1 µm × 200 µm broad area laser diode applied with a specially designed feedback circuit. When operating at two times threshold, 50% of the freely running system output power is obtained in a single beam with an M² beam quality factor of 1.6 ± 0.1, whereas the M² values of the two freely running diode lasers are 29 ± 1 and 34 ± 1, respectively.
ACCESSION #
8989351

 

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