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Journal of the Optical Society of America A

Dye gain measurement technique based on spectral linewidth narrowing (A)

Thomas Efthimiopoulos, Brian K. Garside

Published Oct 1, 1977• 0 citations
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A comparison is reported of the observed spectral narrowing of amplified spontaneous emission from dye amplifiers with predictions from a dynamical model based on rate equations. This is employed to develop a generally applicable method of determining the unsaturated gain within the dye medium. Comparison is made with another technique for determining gain over the restricted pumping range for which it is applicable. The matching of theory to experiment is sufficiently sensitive that good values can also be determined for the wavelength dependence of the excited singlet state absorption cross section.
At very low temperatures, the spread in the different environments of matrix embedded dye molecules results in an inhomogeneously broadened S1 ← S0 band. Spectroscopic techniques based on the appearence of optical zero phonon lines, such as fluorescence line narrowing, spectral hole-burning, and single molecule spectroscopy provide an experimental resolution limited by the homogeneous linewidth. From the investigation of the homogeneous line width as a function of different parameters (time, temperature) information on the guest host interactions responsible for the observed linewidth is obtained. Spectrally narrow features are extremely sensitive probes for external perturbations, such as electric fields, magnetic fields, or hydrostatic pressure.