An active fiber-optic Fabry-Perot filter with an optical bandwidth adjustable in the 1–100-kHz range for λ = 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 Nd3+-doped fiber.
© 1992 Optical Society of America
Hendrik Sabert and Reinhard Ulrich, "Gain stabilization in a narrow-band optical filter," Opt. Lett. 17, 1161-1163 (1992)