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-polarized ESA- (solid line) and GSA- (dotted line) spectrum of an crystal near under excitation. and are the cross sections of stimulated emission and excited state absorption, is the population density of level , and is the total excitation density summed over all excited levels (see Ref. 7). The OPS center pump wavelengths used in the different laser experiments are indicated with dashed lines.
Energy level scheme of . The two-step upconversion pump mechansim for the laser transition at 552 nm is indicated.
Experimental setup for fourfold pass pumping.
OPS spectra at the center pumping wavelengths used in different experiments.
Input-output characteristics for an OPS pumped crystal lasing at 552 nm under cw (dots) and 50% duty cycle pumping (squares).
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