Abstract

We have used coherent photon seeding to reduce the noise in an actively mode-locked extended-cavity semiconductor laser. Feedback is provided by an auxiliary cavity terminated either by a wedge plate or by a phase-conjugate mirror. Both conventional and phase-conjugate feedback can reduce the low-frequency noise components (0–5  MHz) by as much as 36  dB, hence drastically reducing the pulse fluctuations. A noise reduction of as much as 18  dB is also observed in the 0.01–3.0-GHz frequency range. We obtained these results while preserving the pulse duration (26  ps) and improving the time–bandwidth product.

© 1998 Optical Society of America

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