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Optically switched reflection with a distributed-feedback dye laser

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Abstract

Bragg scattering of a spatially modulated gain grating, which is the basis of a distributed-feedback dye laser (DFDL) operation,1 is used to construct a spectrally selective narrow-bandwidth mirror-type device. The experimental apparatus (Fig. 1) consists of a CuBr laser which pumps both the DFDL and a Hansch-type dye laser (HTDL). Both lasers operate with rhodamine 6G. The HTDL beam is directed into the DFDL dye cell at a small angle of several milllradians with respect to the DFDL beam. When the frequency of the HTDL beam lH is tuned in the vicinity of the DFDL frequency, a reflected beam lREFL is detected (Fig. 1). The inset in Fig. 1 depicts the ray path in the dye cell. A mirrorlike action is obtained by the Bragg scattering in conjunction with reflection from the dye-cell interface. Figure 2 shows the reflectivity as a function of HTDL detuning from the DFDL frequency. For small incident angles, the Bragg frequency is equal, within our spectrometer resolution, to DFDL frequency. The reflectivity has spectral selectivity of FWHM of 4 cm−1 (Fig. 2), which is equal to the convolution of both laser bandwidths.

© 1986 Optical Society of America

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