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Chemical Physics Letters

Thermal recovery of spectral holes of dye molecules in polymer films. Site distribution in two-level systems

Ta‐Chau Chang, Chien-Chih Chiang, Gerald J. Small, Shiow-Hwa Chou

Published Jun 1, 1994• 12 citations
Publisher
DOI
10.1016/0009-2614(94)00436-6

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We have developed a new integrated narrowband spectral filter, which consists of a planar waveguide covered with a thin polymer film containing molecules, which undergo persistent spectral hole burning at liquid helium temperature. We show that such a device performs as a miniature programmable narrowband spectral filter, with a transmission bandwidth less than 1 GHz. In such a filter the frequency resolution is limited by the width of the homogeneous zero-phonon lines of the chromophore molecules, and not by the geometrical dimensions of the device. Experimental measurements in the time domain using a picosecond dye laser, and in the frequency domain using a single-mode diode laser, are presented.