Effects of pump modulation on a four-level laser amplifier

Stephen H. Chakmakjian, Karl Koch, Stephanos Papademetriou, and C. R. Stroud, Jr.

JOSA B 6, 1746 (1989).

A theory is developed to describe the way in which modulations in the pump intensity produce modulations in the gain of a four-level, homogeneously broadened laser amplifier. The theory is tested by carrying out an experiment using an alexandrite crystal pumped by a CW dye laser. A second dye laser is used to measure the gain in the inverted laser transition. The dependence of the magnitude and the bandwidth of the gain on the pumping rate is determined. Agreement between theory and experiment is good.

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