美国康奈尔大学电子物理研究所研制成功一种可调频率的激光发生器.这种激光器与目前只产生单一频率光束的激光器不同,它发生的波长可以在紫外线和红外线之间很宽的光学频谱范围内进行调整.它采用β～硼酸钡晶体作为激光源,激光波长由光线射入晶体的角度决定.因此,只需旋转晶体的倾斜面,就能任意改变激光的波长. The Institute of Electron Physics at Cornell University in the United States succeeded in developing a tunable frequency laser generator that, unlike lasers currently producing only a single frequency beam, takes on a wavelength that can be very wide ranging between ultraviolet and infrared It uses β-barium borate crystal as the laser source, and the laser wavelength is determined by the angle of the light incident on the crystal, so the laser wavelength can be arbitrarily changed simply by rotating the tilted surface of the crystal.