Photocurrent spectroscopy of Bragg mirrors in vertical cavity surface emitting lasers

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Abstract
We describe a simple technique to precisely measure the reflectivity spectra of the Bragg mirrors in individual vertical cavity surface emitting lasers. Detailed reflectivity spectra are obtained by measuring the response of the active layer junction to light impinging upon the output mirror, corrected by the active layer response spectrum. Precise measurements of the emission spectrum of the laser with respect to the Fabry–Perot notch are then possible. In the temperature range of 20–100 °C we measure the rates of 0.56 and 0.62Å/°C for the mirror stack and the lasing wavelength, respectively.