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New borate crystals promise deep-UV harmonic generation
Chuangtian Chen, Laser Focus World February, 2004

The author is the inventor of BBO and LBO crystals.
"Applications in semiconductor lithography, laser micro-machining and materials processing, as well as laser spectroscopy and photochemical synthesis, all call for coherent radiation wavelengths below 200 nm...."

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High-repetition-rate, intracavity-pumped KTP OPO at 1572 nm
Zendzian W et. al. , APPLIED PHYSICS B-LASERS AND OPTICS, Vol.80, 329 (2005)

 An efficient, eye-safe, high-repetition-rate, intracavity optical parametric oscillator (IOPO) inside an acousto-optically Q-switched Nd:YVO4 laser end pumped by a 30-W fiber-coupled diode laser was demonstrated. The pumping, acousto-optically Q-switched Nd:YVO4 laser gives 3-W average output power at 1064-nm wavelength at 40-kHz repetition rate. An additional separating mirror, 'x-cut' KTP crystal and output coupler highly reflective at 1064-nm and partially transparent at 1572-nm wavelengths form a flat-flat IOPO resonator of 35-mm length. We have achieved 3-ns-duration pulses for 20-mm-long KTP and 4-ns-duration pulses for 30-mm-long KTP, respectively. More than 8-kW-peak-power pulses with an average power of 1.5 W at the signal wavelength for 40-kHz repetition rate were demonstrated. Due to the intracavity spatial cleaning effect, a near diffraction limited signal beam was achieved despite a relatively worse beam quality of the pumping beam. Conversion efficiencies of 50% with respect to Q-switched output at 1064-nm wavelength and 11 % with respect to diode pump power were achieved.

High-average-power femtosecond pulse generation in the blue by use of BiBO
M. Ghotbi et al,  OPTICS LETTERS, Vol. 29, No. 21,  2530(2004)

Efficient generation of tunable femtosecond pulses in the blue is reported in the nonlinear crystal BiBO. By use of fundamental pulses from a mode-locked Ti:sapphire laser at 76 MHz, single-pass second-harmonic average powers of as much as 830 mW have been generated at 50% conversion efficiency, and a tunable range of 375–435 nm in the blue is demonstrated. Temporal measurements result in blue pulse durations of 220 fs for 130-fs fundamental pulses. Direct experimental comparison with more widely used BBO crystal confirms the superior performance BiBO for second-harmonic generation of femtosecond pulses.

Long-term operation of CsLiB6O10 at elevated crystal temperature
Y. K. Yap et al., Optics Letters, Volume 23, Issue 1, 34-36(1998)

They resolved  the degradation problem of CLBO by means of elevated crystal temperature. CLBO crystals were continuously operated at 160C in ordinary room humidity. No degradation of performance was observed after more than 1 month.

Sub-5 fs pulse generation from a noncollinear optical parametric amplifier
T. Kobayashi et al., Meas. Sci. Technol. 13, 1671(2002)

The noncollinear optical parametric amplifier (NOPA) is one of the most useful light sources at an extremely short timescale. With a BBO crystal, transform-limited visible pulses with as short as sub-5 fs duration have been generated for the first time ...

Frequency doubling property of the low symmetric nonlinear optical crystal BIBO
Z. Wang et al.,  ACTA PHYSICA SINICA , 52 (9): 2176-2184 SEP 2003

The refractive index of BIBO was measured. A systematic research was performed on the frequency-doubling property of the BIBO crystal. The largest effective nonlinear optical coefficient was found in the Type- I phase-matching direction ( 168.9 degrees, 90 degrees).

SHG in BiBO produces 2.8W of blue @ 473nm

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Generation of femtosecond laser pulses tunable from 380 nm to 465 nm via cascaded nonlinear optical mixing in a noncollinear optical parametric amplifier with a type-I phase matched BBO crystal
C. Lee , et al,  OPTICS EXPRESS, 11 (14): 1702-1708 JUL 14 2003

Generation of tunable femtosecond pulses from 380nm to 465nm near the degenerate point of a 405-nm pumped type-I BBO noncollinearly phase-matched optical parametric amplifier (NOPA)...

High-power intracavity frequency doubling of a Ti : sapphire fs oscillator
T. Andersen, APPLIED PHYSICS, B76, 639(2003)

The cavity is extended with a pair of focusing mirrors and a 0.5-mm-thick BBO crystal. They achieve a repetition rate of 50 MHz and simultaneously generate 22 mW of 55-fs pulses at 810 nm and 200 mW of 73-fs pulses at 405 nm...

Absolute measurement of the effective nonlinearities of KTP and BBO crystals ...
D. Armstrong et al.,  APPLIED OPTICS, 35, 2032(1996)

Absolute magnitudes of the effective nonlinearity, deff, were measured for seven KTP and six BBO crystals.

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