Abstract
We present studies of the optical properties of the new nonlinear material BiB3O6 for second harmonic generation from the visible to infrared. We have determined the phase-matching conditions and effective nonlinear coefficients in the three principal optical planes, acceptance bandwidths, spatial and temporal walkoff, group velocity dispersion and double phase-matching behaviour. We also report on experimental studies in this material, where efficient, high-average-power second harmonic generation of femtosecond pulses into the blue is demonstrated. Using 130-fs fundamental pulses at 76 MHz, single-pass second harmonic average powers as much as 830 mW at greater than 50% conversion efficiency have been generated over a tunable range of 375-435 nm. Using cross-correlation measurements in a 100-mum beta-BaB2O4 crystal second harmonic pulse durations of 220 fs are obtained. Our theoretical findings are verified by experimental data, where excellent agreement between the calculations and measurements is obtained. Direct comparison of BiB3O6 with beta-BaB2O4 also confirms improved performance of this new material for second harmonic generation of femtosecond pulses.
Highlights
In the field of nonlinear frequency conversion there remains a continued need for new materials with improved linear and nonlinear optical characteristics, including higher nonlinear coefficients, wider transmission range, more flexible phase-matching properties, enhanced optical damage tolerance, chemical, thermal, and mechanical stability.For the visible and ultraviolet (UV) spectral range, the nonlinear crystals of β-BaB2O4 (BBO) and LiB3O5 (LBO) have been established as materials of choice for a range of frequency conversion applications
BiB3O6 (BIBO), is a newly developed nonlinear material [1,2] with unique optical properties for frequency conversion in the visible and UV. It combines the advantages of UV transparency and high optical damage threshold, as in BBO and LBO, with enhanced optical nonlinearity, as in KTP
We present full characterisation of our experiments on single-pass second harmonic generation (SHG) of tunable femtosecond pulses into the blue in BIBO, where average powers of as much as 830 mW at conversion efficiencies exceeding 50% have been generated
Summary
In the field of nonlinear frequency conversion there remains a continued need for new materials with improved linear and nonlinear optical characteristics, including higher nonlinear coefficients, wider transmission range, more flexible phase-matching properties, enhanced optical damage tolerance, chemical, thermal, and mechanical stability. For the visible and ultraviolet (UV) spectral range, the nonlinear crystals of β-BaB2O4 (BBO) and LiB3O5 (LBO) have been established as materials of choice for a range of frequency conversion applications They offer wide transmission range well into the UV and high optical damage threshold. The effective nonlinear coefficient of BIBO has been reported as 3.2 pm/V at 1079 nm [2], which is larger than those of BBO and LBO, and comparable to that in KTP Such a combination of properties makes BIBO an attractive nonlinear material for a wide range of frequency conversion applications in the visible and UV spectral regions. We present full characterisation of our experiments on single-pass SHG of tunable femtosecond pulses into the blue in BIBO, where average powers of as much as 830 mW at conversion efficiencies exceeding 50% have been generated
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