Parametric investigation of optically pumped alkali vapor laser
by Tom Cohen
at Special seminar
Tue, 24 Nov 2015, 12:00
Nano building (#51) room 015, pay attention to unusual place and time!!!!
In this research we have set up a system utilizing a Ti:Sapphire pump source providing over 850mW with spectral width of 0 04nm in order to investigate and optimize some parameters of an alkali vapor laser A 2cm long glass cell containing cesium vapor and ethane buffer gas served as the gain medium which produced over 370mW laser power under optimal conditions The slope efficiency ranged from 46 to 56 the optical to optical efficiency reached 43 and the beam quality factor M2 was in the range of 1 2 4 The data gathered in the experiments pointed out to an optimum cavity configuration that produced a laser beam with an average radius of 133 m along the gain medium and an optimal pump beam radius of 85 m At narrower pump beam radii saturation of the gain was observed corresponding an intensity of 45W mm2 The temperature of the cell was optimized in each experiment to eventually provide insight of some important considerations: higher temperature on the one hand improves absorption of the pump due to increased cesium density but on the other hand increases the losses due to spontaneous emission The optimal temperature increases with the decreasing pump beam radius from 84oC at pump radius of 202 m to 106oC at pump radius of 55 m
Created on 17-11-2015 by Bar Lev, Yevgeny (ybarlev)
Updaded on 17-11-2015 by Bar Lev, Yevgeny (ybarlev)