Abstract
The diagnostic of ozone in troposphere is one of important problems in ecology. The most efficient tool for studying the altitude distribution of ozone is the different absorption lidar (DIAL). In the DIAL measurements, the radiation wavelengths belonging to and off the ozone absorption band (absorbed and reference lines, respectively) are used. The wavelength below 300 nm is needed for this purpose. Traditionally large size eximer lasers with a Raman conversion in gases are used as sources of this radiation. There is also an approach based on Raman conversion of a second harmonic of Nd:YAG laser in a barium nitrate crystal and frequency doubling of first Stokes radiation at the wavelength of 563 nm [1], The advantage of this approach is the possibility of creation of simple all-solid-state sources. To obtain the second harmonic radiation with enough energy it is necessary to generate efficiently first Stokes pulses with high energy. Efficient operation of barium nitrate Raman lasers pumped by a second harmonic of Nd:YAG laser was successfully demonstrated but only for relatively low pump and output energies. The use of high pump energy leads to the parasitic generation of a second order Stokes component. This limits the energy of first Stokes pulses. The second order Stokes generation can be partially suppressed by the use of selective cavity mirrors, but practically mirrors have a finite reflection at second Stokes wavelengths and that results in the second Stokes generation in linear cavity. In this report, we demonstrate that the use of folded cavity for Raman laser allows to obtain the efficient high-energy first Stokes generation.
© 2007 IEEE
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