We report a novel frequency tripler for efficient conversion of broadband high power laser pulses at 1 μ;m. The tripler is
composed of several segmented partially deuterated KDP with discrete values of deuteration. Deuteration level can be
used as a degree of freedom to alter the phase-matching wavelength of a partially deuterated KDP crystal. The
segmented partially deuterated KDP crystal is made by thermal bonding method. It has been shown that this new tripler
is capable of enhancing the acceptance bandwidth of frequency tripling. A two-segment design is presented, which is
applicable to the efficient frequency tripling of chirped pulses with a bandwidth of ~1.2-nm.
By third-order nonlinear coupling and tightly focusing the beams in a single crystal of BBO, high
intensity broad-bandwidth femtosecond pulses are used to generate 50μJ of light at 270nm (up to
1% THG efficiency). It is proved that the major contribution to the THG observed is the third-order
process, not the cascaded second-order process. And the primary reasons why THG efficiency is
about 1% is that 1ωlight is frequency-chirp beams and BBO crystal isn't tuned to optimized angle.
At last, the methods to improve the third harmonic conversion efficiency have been put forward.
By third-order nonlinear coupling and tightly focusing the beams in a single crystal of BBO, high intensity broad-bandwidth femtosecond pulses are used to generate 50&mgr;J of light at 270nm (up to 1% THG efficiency). And it is proved that the major contribution to the THG observed is the third-order process, not the cascaded second-order process.
The design of the Large Laser Facility incorporates a type-I-type-II third harmonic generator to convert the 1.053μm fundamental wavelength of the laser amplifier to a wavelength of 0.351μm for target irradiation. To understand the design of frequency conversion system, we have carried out a series of theory researches and experiments, including parameters optimization of the third harmonic converter, experiments on high-intensity third harmonic generation (THG), researches on Transverse Stimulated Raman Scattering (TSRS) in the converting crystal and on broad-band third harmonic generation.
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