Abstract
We report experiments where we use a photorefractive oscillator (PRO) to convert incoherent optical fields produced when a laser beam passes through a multimode optical fiber back into a single-mode beam. We show it is theoretically possible for >80% of the input power to be delivered in the form of a single mode beam coupled through a low reflection mirror at the output of the PRO. In our experiments where a cw-pumped Q-switched frequency-doubled Nd:YAG laser pumped a barium titanate crystal as the phase conjugated' at the input to the PRO, >25% output was achieved. This value is limited by crystal absorption (1.1 cm-1), and the available photorefractive gain. It is shown that only small improvements in both quantities are required to achieve output powers >50% of the input. Even in the current experiments, however, the brightness at the PRO output is 2-3 orders of magnitude higher than that at the multimode fiber output.
© 1992 Optical Society of America
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