Efficient UV output (205nm-310nm) with a SHG efficiency of over 10% at wavelength of ≥206nm was obtained in type I BBO, and 36% BBO crystals conversion efficiency was achieved for a XeC1-laser pumped Dye laser with power 150KW which is about 4-6 times higher than that in ADP. The shortest SHG wavelength of 204.97 nm with efficiency of about 1% has been generated in BBO.
More than 50% of SHG Nonlinear crystals conversion efficiency in a Ti:Sapphire laser has been obtained in BBO. High conversion efficienies have been also obtained in BBO for the THG and FHG of Ti:Sapphire lasers.
1.OPO pumped at 532 nm
An OPO output ranging from 680 nm to 2400 nm with the peak power of 1.6MW and up to 30% energy conversion efficiency was obtained in a 7.2 mm long type I BBO. The input pump energy was 40 mJ at 532nm with pulse-width 75ps. With a longer BBO crystal, higher Nonlinear crystals conversion efficiency is expected.
2.OPO and OPA pumped at 355 nm
In the case of Nd:YAG pumping,BBO’s OPOs can generate more than 100mJ,with wavelength tunable from 400nm to 2000nm. Using CASTECH’s BBO crystal, the OPO system covers a tuning range from 400nm to 3100nm which guarantees a maximum of 30% and more than 18% Nonlinear crystals conversion efficiency, over the wavelength range from 430nm to 2000nm.
Type II BBO can be used to decrease linewidth near the degenerate points. A linewidth as narrow as 0.05nm and usable conversion efficiency of 12% were obtained. However, a longer (>15mm) BBO should normally be used to decrease the oscillation threshold when employing the type II phase-matching scheme.
Pumping with a picosecond Nd:YAG at 355nm, a narrow-band(<0.3nm), high energy (>200μJ) and wide tunable (400nm to 2000nm) pulse has been produced by BBO’s OPAs. This OPA can reach as high as more than 50% conversion efficiency, and therefore is superior to common Dye lasers in many respects, including efficiency, tunable range, maintenance, and easiness in design and operation. Furthermore, coherent radiation from 205 nm to 3500 nm can be also generated by BBO’s OPO or OPA plus a BBO for SHG.
Nonlinear crystals conversion efficiency
bbo crystal conversion efficiency