Letter Phase-mismatching effects in the internal second-harmonic generation in InGaAs quantum-well laser diodes |
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| Authors: | R. G. Ispasoiu E. Smeu N. N. Puscas I. M. Popescu G. I. Suruceanu |
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| Affiliation: | 1. Physics Department , Polytechnic University of Bucharest , 313 Spl. Independentei, 77206, Bucharest, Romania;2. Physics Department , Polytechnic University of Bucharest , 313 Spl. Independentei, 77206, Bucharest, Romania;3. Optoelectronics Laboratory , Technical University of Moldova , 168 Stefan cel Mare, 277012, Chisinau, Moldova |
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| Abstract: | Abstract We have characterized the role of phase-mismatching in the spectral distribution of the internal second-harmonic generation (ISHG) in the CW operation of high-power InGaAs quantum-well laser diodes emitting at around 960 nm. The observed pairs of narrow blue-green peaks of ISHG have symmetrical spectral positions with respect to the central peak of the pure second harmonic at ～480 nm, suggesting that their generation in the laser waveguide is most probably mediated by a mechanism of reciprocal cancellation of the respective phase-mismatch vectors. The relatively strong emission of the ISHG radiation at the output mirror facet indicates that this second-order nonlinear optical process is enhanced by waveguiding in the laser active region. |
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