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Highly coherent modeless broadband semiconductor laser

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Abstract

We report on the highly coherent modeless broadband continuous wave operation of a semiconductor vertical-external-cavity-surface-emitting laser. The laser design is based on a frequency-shifted-feedback scheme provided by an acousto-optic frequency shifter inserted in a linear or a ring traveling wave cavity. The gain mirror is a GaAs-based multiple quantum well structure providing large gain at 1.07 μm. This laser exhibits a coherent optical spectrum over 1.27 nm (330 GHz) bandwidth, with 70 mW output power and a high beam quality. The light polarization is linear (>30dB extinction ratio). The laser dynamics exhibits a low intensity noise close to class A regime, with a 1.5MHz cutoff frequency. The frequency noise spectral density shows a first-order low-pass like shape (130 kHz cutoff) leading to a Gaussian shape for homodyne interferometric signals. The measured beat width is 54kHz and the coherence time of 19μs. No nonlinear effects are observed, showing dynamics very close to theory.

© 2015 Optical Society of America

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