TITLE

Piezoacoustic modulation of gain and distributed feedback for quantum cascade lasers with widely tunable emission wavelength

AUTHOR(S)
Kisin, Mikhail V.; Luryi, Serge
PUB. DATE
February 2003
SOURCE
Applied Physics Letters;2/10/2003, Vol. 82 Issue 6, p847
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Due to the piezoelectric properties of III-V materials, an acoustic wave propagating along the optical axis of a unipolar laser produces a periodic modulation of the carrier density and the optical gain, sufficient for providing distributed feedback (DFB) with a mode suppression ratio exceeding 30 dB. In contrast to bipolar lasers, the piezoelectric modulation of unipolar carrier density is not accompanied by a degradation of the average gain. Inasmuch as the acoustic frequency can be easily changed, the wavelength of the main DFB mode can be tuned in a wide range. This property should be very attractive for spectroscopic applications of the quantum cascade laser.
ACCESSION #
9036520

 

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