CdSe IR crystal

Description

Laser systems with CdSe crystal have obvious advantage,such as,much broader tuning range. In the difference-mixing of the output of parametric oscillator in CdSe to obtain the phase matched 9.***4.3 μm tuning range. CdSe crystal has its band edge in the near infrared and shows transmission far into the infrared. The long wavelength limit determined by the onset of lattice absorption * *-*@********************here is also a narrow impurity absorption centered at *8.5μm which varies from one crystal to another. As a nonlinear optical material, CdSe crystal was explored for OPG, OPO and DFG in ***0’s. First of all, picoseconds pulses tunable from *0 to *0 μm were produced. Furthermore, CdSe was also used to achieve megawatt peak power in the range of ***3 and ***2 μm , based on OPG and OPO respectively.