Open AccessSpectral linewidth narrowing of two broad-area blue laser diodes (445 nm) with a common external cavity
Author(s) -
Parashu R. Nyaupane,
Patrick LiKamWa,
Yehuda Braiman
Publication year - 2021
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.425409
Subject(s) - laser linewidth , optics , laser , materials science , diode , tilt (camera) , grating , injection seeder , distributed feedback laser , laser power scaling , semiconductor laser theory , optoelectronics , beam (structure) , physics , mechanical engineering , engineering
Two watt-level broad-area laser diodes were simultaneously locked into a common external cavity made using a surface grating in a Littrow configuration. The spectral linewidth of the combined laser beam was narrowed down from over a nanometer to 10-15 pm (FWHM), and the output power was the sum of the power of the individually locked laser diodes. The spectrum of the combined laser beam can be tuned over a range of 2-3 nm by changing the tilt angle of the grating and varying the injection currents of each laser diode.