Suppression of intensity noise in a diode-pumped Tm-Ho : YAG laser

We investigate the intensity noise induced by pump-power fluctuations in a diode-pumped single-frequency codoped Tm-Ho:YAG laser and we measure, in th e frequency domain, the corresponding transfer function. Good agreement bet ween the measured transfer functions and the theoretical prediction is foun d. A relative intensity-noise level of similar to -110 dB/Hz from similar t o1 kHz to the relaxation-oscillation frequency, with complete suppression o f the relaxation-oscillation peak, is achieved by use of a suitable optoele ctronic feedback circuit. (C) 2000 Optical Society of America OCIS codes: 1 40.3480, 140.3430, 140.3590, 140.3570, 140.3070.