Quasi-phase-matched second-harmonic generation by use of a total-internal-reflection phase shift in gallium arsenide and zinc selenide plates

Abstract

We fabricated a novel quasi-phase-matched frequency converter, using a zigzag optical beam path in a thin, polished parallel plate. Second-harmonic generation experiments demonstrated angle-tuned output at 4.6 to 5.3mum in GaAs and 1.7 to 2.0mum in ZnSe crystals when pulsed infrared laser sources were used.

Developments of mid-infrared optical parametric oscillators for spectroscopic sensing: a review

“…The relative phase shift experienced at total internal reflection is used to reset the relative phases between interacting waves. [46][47][48] The advances in the fabrication of structured ferroelectrics, meanwhile, have established this technique for efficient frequency-conversion applications. 49,50 QPM offers two major advantages over birefringence phase-matching.…”

Optical Parametric Generators and Amplifiers

“…The vector q has a direction along the direction of the χ (2) modulation and the length of |q| = l c /Λ, where Λ is the spatial modulation period. The modulation of the nonlinearity can be accomplished by periodically inverting the sign of the χ (2) susceptibility, utilizing a zigzag optical path in slabs of nonlinear material with total-internal reflection [11,35,36] or by modulating the amplitude of the second-order susceptibility by periodically modifying the material properties, for instance, by employing quantum-well intermixing in GaAs-AlAs waveguides [37][38][39]. The latter two QPM methods have rarely been used so far either because of the relatively high losses as in the case of the totalinternal-reflection geometry, or due to the small thickness of the modulation which mandates a waveguide geometry for the frequency conversion device.…”

Broadband second-harmonic generation in a double-tapered gallium arsenide slab using total internal reflection quasiphase matching

“…The advent of total internal reflection (TIR) QPM [5] in a plane parallel isotropic slab has indeed exaggerated the use of isotropic semiconductors like gallium arsenide (GaAs), zinc selenide (ZnSe), zinc sulphide (ZnS), etc. for newer optical frequency generation through resonant as well as nonresonant scenarios [6][7][8]. In the case of a parallel slab [6,7], the width, t, of the slab is optimized to have maximum conversion yield for secondharmonic generation (SHG) of a given input laser wavelength.…”

“…for newer optical frequency generation through resonant as well as nonresonant scenarios [6][7][8]. In the case of a parallel slab [6,7], the width, t, of the slab is optimized to have maximum conversion yield for secondharmonic generation (SHG) of a given input laser wavelength. But since a broadband SHG frequency converter converts a band of frequencies, rather than a single frequency, it is difficult to optimize the interaction length between successive bounces for each frequency available in the input broadband source using a parallel slab configuration.…”