Temperature-tuned noncritically phase-matched frequency conversion in LiB3O5 crystal

The new nonlinear crystal of lithium triborate, LiB3O5 (LBO), was investigated for frequency doubling and mixing of 1064 nm, 1135 nm and 1908 nm operated at the noncritically phase-matched (NCPM) temperatures of 149°C (for doubling 1064 nm), 77.4°C (for doubling 1135 nm), 112°C (mixing 1064 and 1135 nm) and 81°C (mixing 1064 and 1908 nm). The temperature tuning curves (from 0°C to 150°C), angular and temperature bandwidths are measured and compared with the calculated values.