Abstract
Distributed feedback (DFB) solid state dye laser with optically induced periodic gain modulation is a compact laser capable of tunable lasing from the UV to the near JR. Using E377 dye-doped sol-gel silica as gain medium, pumped by a Q-switched laser at 308nm, DFB laser emission in the near UV has been successfully demonstrated. Wavelength tuning from 367nm to 383nm with an emission spectrum linewidth of 8Opm has been realized by varying the pump beams intersection angle, and a slope efficiency of 4.4% has been obtained. Similarly, DFB laser emission tuning has also been realized by varying the refractive index of the gain material. Wavelength tuning has been first achieved by temperature variation of the R6G doped poly(methyl methacrylate) and sol-gel silica bulk in the DFB structure. Tunable output from 573nm to 556nm has been demonstrated. The thermal coefficients of the refractive index of sol-gel silica have been measured for the temperature ranges of 21°C to 43°C and 43°C to 58°C.
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