NEW LASER WAVELENGTHS OBTAINABLE FROM A Nd:YAG LASER THROUGH NON-LINEAR OPTICAL TECHNIQUES
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Publisher:Ohio State University
The unique properties of laser radiation have led to considerable interest in the use of various types of lasers for spectroscopic investigations such as Raman, Rayleigh and Mie scattering measurements, selective photo-excitation and photo-dissociation, energy transfer mechanism, and gas breakdown studies. The utility of lasers for these investigations has been enhanced due to the development of organic dye lasers and the parameteric oscillator, both of which are capable of high intensity, short pulses of radiation at wavelengths which are tunable through extended spectral ranges. In this paper a review will be given of the variety of laser output wavelengths that are obtainable from a Nd:YAG laser when different feedback and frequency-mixing schemes are employed in the laser cavity. Due to recent advances in nonlinear optics (notably, optimum intracavity output coupling and modulation techniques) frquency-doubling and frequency-mixing can be achieved with efficiences approaching 100%. Combined with the fact that the Nd:YAG laser can be made to oscillate at different fundamental frequencies, these high efficiencies allow a choice to be made from a variety of output wavelengths which extend from the near IR, through the visible and into the near UV. Moreover, these outputs can be obtained as continuous (CW) as well as pulsed sources of monochomatic radiation. Results of analytical and experimental evaluation of the output powers at various visible wavelengths will be presented.
Author Institution: Electro-Optical Systems
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