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Papers by Martin Fejer

Research paper thumbnail of Growth of alternating 〈100〉/〈111〉-oriented II-VI regions for quasi-phase-matched nonlinear optical devices on GaAs substrates

Applied Physics Letters, 1994

We present a technique for fabricating laterally patterned 〈111〉 and 〈100〉-oriented regions of Cd... more We present a technique for fabricating laterally patterned 〈111〉 and 〈100〉-oriented regions of CdTe on GaAs by metalorganic chemical vapor deposition. Patterning of the crystal orientation is important for quasi-phase-matched nonlinear optical frequency conversion in semiconductor waveguides. Scanning electron micrographs and x-ray diffraction analysis are used to confirm the presence of 〈111〉/〈100〉 grating structures. The CdTe layer is shown to be a suitable template to pattern the orientation of subsequently grown wide-band-gap films of ZnSe and ZnTe.

Research paper thumbnail of Efficient continuous wave second harmonic generation pumped at 1.55 µm in quasi-phase-matched AlGaAs waveguides

Optics Express, 2005

We have fabricated quasi-phase-matched AlGaAs waveguides for continuous-wave second-harmonic gene... more We have fabricated quasi-phase-matched AlGaAs waveguides for continuous-wave second-harmonic generation (SHG) pumped around 1.55 μm. We find that the losses, which limit the conversion efficiency of this type of waveguide, are resulted from two corrugations--the initial template corrugation and the regrowth-induced domain-boundary corrugations. We are able to reduce the waveguide loss by improving the growth conditions. The waveguide loss is 6-7 dB/cm at 1.55 μm, measured using the Fabry-Perot method. A record internal SHG conversion efficiency of 23 %W -1 for AlGaAs waveguides is achieved using a 5-mm-long waveguide with a pump wavelength of 1.568 μm.

Research paper thumbnail of Growth of alternating 〈100〉/〈111〉-oriented II-VI regions for quasi-phase-matched nonlinear optical devices on GaAs substrates

Applied Physics Letters, 1994

We present a technique for fabricating laterally patterned 〈111〉 and 〈100〉-oriented regions of Cd... more We present a technique for fabricating laterally patterned 〈111〉 and 〈100〉-oriented regions of CdTe on GaAs by metalorganic chemical vapor deposition. Patterning of the crystal orientation is important for quasi-phase-matched nonlinear optical frequency conversion in semiconductor waveguides. Scanning electron micrographs and x-ray diffraction analysis are used to confirm the presence of 〈111〉/〈100〉 grating structures. The CdTe layer is shown to be a suitable template to pattern the orientation of subsequently grown wide-band-gap films of ZnSe and ZnTe.

Research paper thumbnail of Efficient continuous wave second harmonic generation pumped at 1.55 µm in quasi-phase-matched AlGaAs waveguides

Optics Express, 2005

We have fabricated quasi-phase-matched AlGaAs waveguides for continuous-wave second-harmonic gene... more We have fabricated quasi-phase-matched AlGaAs waveguides for continuous-wave second-harmonic generation (SHG) pumped around 1.55 μm. We find that the losses, which limit the conversion efficiency of this type of waveguide, are resulted from two corrugations--the initial template corrugation and the regrowth-induced domain-boundary corrugations. We are able to reduce the waveguide loss by improving the growth conditions. The waveguide loss is 6-7 dB/cm at 1.55 μm, measured using the Fabry-Perot method. A record internal SHG conversion efficiency of 23 %W -1 for AlGaAs waveguides is achieved using a 5-mm-long waveguide with a pump wavelength of 1.568 μm.

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