Characterization of an AlGaAs rib waveguide using a grating in a Fabry–Perot étalon configuration

Vasey, F.; Stauffer, J. M.; Oppliger, Y.; Reinhart, F. K.

doi:10.1364/ao.30.003897

Cited by 3 publications

(1 citation statement)

References 13 publications

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“…One motivation for placing a thick grating within a cavity has been to characterize the grating, for example an AlGaAs rib waveguide [9]. However, most of the work on gratings within cavities has been motivated by the desire to increase the diffraction efficiency.…”

Section: Introductionmentioning

confidence: 99%

Enhanced diffraction of light in GaAs microcavities

1995

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We analyze theoretically the diffraction of light by gratings that are photogenerated in Fabry-Pérot microcavities. The coupled wave theory of volume gratings is combined with appropriate boundary conditions to yield expressions for the diffraction efficiency. Multiple round trips within the cavity are seen to increase the effective grating thickness, and therefore the efficiency. Numerical calculations specific to GaAs microcavities show that the diffraction efficiency can be enhanced by more than two orders of magnitude at the resonant wavelengths.

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Section: Introductionmentioning

confidence: 99%

Enhanced diffraction of light in GaAs microcavities

1995

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The refractive index of AlxGa1−xAs below the band gap: Accurate determination and empirical modeling

Gehrsitz

Reinhart

Gourgon

et al. 2000

Journal of Applied Physics

291

161

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The refractive indices of AlxGa1−xAs epitaxial layers (0.176⩽x⩽1) are accurately determined below the band gap to wavelengths, λ<3 μm. The layers are grown on GaAs substrates by molecular beam epitaxy metal organic and chemical vapor deposition with thicknesses ranging from 4 to 10 μm. They form improper waveguide structures with the GaAs substrate. The measurements are based on the excitation of the improper waveguide modes with grating couplers at 23 °C. The refractive indices of the layers are derived from the modal propagation constants in the range of 730 nm<λ<830 nm with an estimated uncertainty of Δn=5×10−4. The temperature coefficient of the refractive index is investigated in the same spectral range. From the effective indices of the TE and TM modes, we derive the strain-induced birefringence and the elasto-optic coefficients. High-resolution x-ray diffraction is used to determine the strain of the layers. The layer compositions are obtained with inductively coupled plasma atomic emission spectroscopy. The measurement range of the refractive index is extended from the direct gap to λ<3 μm by observing the Fabry-Pérot interference fringes of the transmission spectra of isolated layers. The measured values of the refractive index and the elasto-optic coefficient are compared to calculated data based on semiempirical models described in the literature. Published data of the index of refraction on GaAs, AlAs and GaP are analyzed to permit the development of a modified Sellmeier approximation. The experimental data on AlxGa1−xAs can be fitted over the entire composition range 0⩽x⩽1 to provide an accurate analytical description as a function of composition, wavelength, and temperature.

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Surface-grating distributed Bragg reflector quantum-well lasers fabricated in AlGaAs–GaAs asymmetric epitaxial waveguides

1999

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Ridge waveguide lasers, integrated with single deep-surface distributed Bragg reflectors (DBR's) in the passive section, were fabricated with a GaAs-AlGaAs double-quantum-well structure in an asymmetric waveguide. Third-order gratings, with a period of 389 nm and defined by holographic lithography, were formed by low-damage reactive ion etching processes. The grating losses and optical coupling coefficients were estimated, in particular, by use of the relationship between the real and the effective grating lengths that were computed and reexamined by measurements of grating periodicity and mode spacing. By use of two different geometries, we produced guide lines for obtaining high-performance lasing properties for these surface-grating DBR lasers. Additionally, a detailed analysis of lasing wavelength shifts was carried out for this study. It was found that injected-carrier-induced effects shift the lasing wavelength much more than gain-loss competition within an extended DBR laser cavity.

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Characterization of an AlGaAs rib waveguide using a grating in a Fabry–Perot étalon configuration

Cited by 3 publications

References 13 publications

Enhanced diffraction of light in GaAs microcavities

Enhanced diffraction of light in GaAs microcavities

The refractive index of AlxGa1−xAs below the band gap: Accurate determination and empirical modeling

Surface-grating distributed Bragg reflector quantum-well lasers fabricated in AlGaAs–GaAs asymmetric epitaxial waveguides

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