Abstract
Amplification of Single Longitudinal Mode (SLM) dye laser was carried out in a transversely pumped rhodamine 6G dye amplifier pumped by 9 kHz Copper Vapor Laser. A spectral mismatch between the tuning range of rhodamine 6G grazing incidence grating SLM oscillator and the rhodamine 6G amplifier efficiency as a function of wavelength was experimentally observed. Amplified Spontaneous Emission (ASE) of the amplifier output with respect to wavelength monotonically decreased from 78.5 % to 1 % as the signal wavelength varied from 553.5 nm to 564 nm. This did not follow the variation of ASE of the SLM oscillator as a function of wavelength. A high amplifier efficiency (7–8 %) and low value of ASE (3–5 %) through out the tuning range of rhodamine 6G SLM oscillator was obtained using pyrromethene 567 (PM567) in the dye amplifier. Performance studies of PM567 dye amplifier as a function of wavelength were carried out. Gain of the rhodamine 6G dye amplifier and rhodamine 6G Littman type single mode dye oscillator was theoretically simulated and explained the observed behavior of amplifier performance of rhodamine 6G dye amplifier in terms of efficiency and ASE.
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