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Temperature and external‐cavity tuning of high‐power GaAsP laser diode
Author(s) -
Bercha A.,
Trzeciakowski W.,
Opachko I. I.
Publication year - 2009
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200824199
Subject(s) - laser linewidth , materials science , laser , optoelectronics , diode , range (aeronautics) , grating , atmospheric temperature range , wavelength , power (physics) , optics , physics , quantum mechanics , meteorology , composite material
Wide‐range temperature tuning of 733 nm GaAsP laser diode has been combined with tuning by external grating. Temperature tuning (down to 87 K) yields the 40 nm range (from 733 nm to 693 nm) with reduced threshold currents and external efficiencies above 1 W/A. High power up to 2 W is achieved in the full tuning range. Fine tuning with grating allows for narrower linewidth but the tuning range decreases from 9 nm at 293 K to zero at 130 K. The wavelength range covered by temperature tuning fills the gap between GaAsP quantum‐well lasers and InGaP/AlGaInP red lasers. High power lasers operating between 690 nm and 730 nm could be useful in medical applications involving photo‐dynamic therapy. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)