Observation of noise phase locking in a single-frequency VECSEL

TL;DR

This paper reports the experimental detection of phase locking effects in the intensity noise spectrum of a single-frequency VECSEL, caused by carrier-population oscillations, which modify the noise profile near the cavity free-spectral-range.

Contribution

It demonstrates the observation of noise phase locking effects in a VECSEL, revealing new insights into noise correlations induced by coherent carrier oscillations.

Findings

Noise correlations created by carrier oscillations.

Modification of noise profile near free-spectral-range.

Phase shift variation affects noise correlations.

Abstract

We present an experimental observation of phase locking effects in the intensity noise spectrum of a semiconductor laser. These noise correlations are created in the medium by coherent carrier-population oscillations induced by the beatnote between the lasing and non-lasing modes of the laser. This phase locking leads to a modification of the intensity noise profile at around the cavity free-spectral-range value. The noise correlations are evidenced by varying the relative phase shift between the laser mode and the non-lasing adjacent side modes.