Abstract

The principle of pumped noise suppression has been successfully applied to semiconductor diode lasers, in order to obtain intensity squeezed light [1]. In these devices the noise suppression in the pump current is achieved by the coupling of the high impedance in series with the laser. In this work, we have investigated the effect of pump noise on a Nd:YVO₄ laser optically pumped by a squeezed diode laser. The pump laser is a diode laser (SDL 5422-H1) with a feedback of an external grating. The pump wavelength is around 808 nm, optimised for the best pump efficiency. The noise of the pump laser is 1dB below shot noise in the frequency range between 1-30 MHz. Technical noise keeps the pump laser noise 2 dB above shot noise in the frequency range below 1 MHz.

© 1998 IEEE