An active fiber-optic Fabry-Perot filter with an optical bandwidth adjustable in the 1-100-kHz range for lambda = 1088 nm radiation is described. Its bandwidth and peak transmission are stabilized by clamping the loss compensating gain of the filter to the gain of a nearby laser oscillation. The filter is electronically continuously tunable. Gain is provided by a Nd(3+)-doped fiber.
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Sabert et al. (1992) studied this question.
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