A tunable OPO with signal wavelengths between 422nm and 477nm has been generated by angle tuning in a type ⅠBBO crystal pumped with a XeCl excimer laser at 308 nm. And a BBO’s OPO pumped by the fourth harmonic of a Nd:YAG laser (at 266 nm) has been observed to cover the whole range of output wavelengths 330 nm – 1370 nm.
When pumped by a 1mJ, 80 fs Dye laser at 615 nm, the OPA with two BBO crystals yields more than 50μJ (maximum 130 μJ), < 200 fs ultrashort pulse, over 800 nm – 2000 nm.
BBO’s E-O Applications ：
BBO can also be used for E-O applications. It has wide transmission range from UV to about 3500nm. And it has much higher damage threshold than KD*P or LiNbO3. More than 80W output power and 50KHz repitition rate have been reached by using CASTECH’s E-O BBO crystals and Nd:YVO4 crystals as gain media. At 5KHz, its pulse has width as short as 6.4ns, and energy of 5.7 mJ or peak power of 900 KW. It has advantages over the commercial A-O Q-switched one, including a very short pulse, high beam quality and size compact as well. Although it has a relative small electro-optic coefficient, and its half-wave voltage is high(7KV at 1064nm, 3x3x20mm3), long and thin BBO can reduce the voltage requirements. CASTECH now can supply 25mm long and 1mm thin high optical quality of BBO crystal with Z-cut, AR-coated and Gold/Chrome plated on the side faces.
This article comes from castech edit released