Frequency conversion of Ti : sapphire-based femtosecond laser systems to the 200-nm spectral region using nonlinear optical crystals

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We review the linear and nonlinear optical properties of crystals transparent near and below 200 nm and suitable for up conversion of femtosecond Ti:sapphire laser sources. beta-BaB2O4, the crystal with the largest birefringence of all presently available materials, is investigated experimentally as a quadrupler by mixing the fundamental and the third harmonic both using a 1-kHz repetition rate Ti:sapphire regenerative amplifier and a 82-MHz mode-locked Ti:sapphire laser. Milliwatt average powers near 200 nm are achieved in both cases. The sub-200-fs pulses at the fourth harmonic are almost bandwidth limited. Sum-frequency generation as a method for upconversion of femtosecond pulses is experimentally studied by mixing the fourth harmonic generated down to 189 nm by the regenerative amplifier with a parametrically generated femtosecond pulse in the infrared. Pulse energies at the microjoule level are produced with LiB3O5 above 180 nm, Li2B4O7 shows superior performance in the 170-180-nm range, and the shortest wavelength achieved with KB5O8. H2O is 166 nm
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
1999-11
Language
English
Article Type
Article
Keywords

VACUUM-ULTRAVIOLET PULSES; HIGH-REPETITION-RATE; 2ND-HARMONIC GENERATION; HARMONIC-GENERATION; LI2B4O7 CRYSTALS; UV GENERATION; SEED PULSES; VUV REGION; NM; AMPLIFICATION

Citation

IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS, v.5, no.6, pp.1532 - 1542

ISSN
1077-260X
DOI
10.1109/2944.814995
URI
http://hdl.handle.net/10203/212798
Appears in Collection
PH-Journal Papers(저널논문)
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