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Opt Express. 2010 Jun 7;18(12):12681-9. doi: 10.1364/OE.18.012681.

Type-0 second order nonlinear interaction in monolithic waveguides of isotropic semiconductors.

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The Edward S Rogers Sr Department of Electrical and Computer Engineering, University of Toronto, 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.


We report the observation of type-0 phase-matching in bulk z-grown Al(x)Ga(1-x)As Bragg reflection waveguides where TM-polarized second-harmonic is generated using TM-polarized pump. For a pulsed pump with 1.8 ps temporal width and an average power of 3.3 mW, secondharmonic power of 16 microW was detected at 1567.8 nm. The normalized nonlinear conversion efficiency was obtained to be 2.84 x 10(3) %W(-1)cm(-2) in a 2.2 mm long waveguide. The highly versatile modal birefringence in Bragg reflection waveguides enabled the phase-matching of the three modalities; namely type-0 TM(omega)-->TM(2omega), type-I TE(omega)-->TM(2omega) and type-II TE(omega)+TMomega-->TE(2omega) interactions to simultaneously take place within a spectral bandwidth as small as 17 nm.

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