New Cslib <sub> 6 </ Sub> O <sub> 10 </ Sub> Crystals For Optical Parametric Oscillator Studies

We studied the optical characteristic of the optical parametric oscillator(OPO) on a new crystal cesium lithium borate(CsLiB6Oio).Because all-solid-state UV laser has the advantage of little bulk, high power and easily to be carried etc. The application and exploitation of it has important value of not only in theory but also practicality. We all know that the output of UV laser mostly depends on the transform of frequency, thus a new kind of excellent nonlinear optics(NLO) crystal is very important for the output of new wavelength. The crystal CLBO provides larger angular, spectral, and temperature constants than that of 3 -BaB2O4(BBO). The efficiency nonlinear coefficient is larger, walk-off angle is smaller and permitted parametric is wider than that of BBO, Which made CLBO become an attractive NLO crystal for generating UV radiation. It can be grown to a 14 X 11 X 11cm3 crystal only in two weeks. CLBO exhibits excellent properties and simplicity in growth on UV NLO. Thus it is suited for generating new wavelength, especially in UV wavelength. We obtained the curves of the angle tuning, threshold and efficiency of CLBO both in type-I and in type-II phase matching (PM) in this paper, and compared to that of BBO.In the section 1, we introduced the development of OPO and the correlative NLO crystal, summarized the background and headway of CLBO. In the section 2, we studied the characteristic of angle tuning curves of CLBO. We have calculated the type-I and type-II angle tuning curves of CLBO according to the momentum and energy conversion laws, and the Sellmeierequations of CLBO. By comparing to that of BBO, we can see that the shortest wavelength of CLBO is shorter than that of BBO both in type-I and type-II phase-matching, especially in type-II. From it we can see CLBO is really a new kind of NLO crystal in OPO. In the section 3, we calculated the threshold and efficiency of Double Resonance Oscillator (DRO) in plane wave of CLBO; we also got the efficiency curves of CLBO in Gaussian beam. By comparing to that of BBO, we can see that the threshold of CLBO is lower than that of BBO. Thus CLBO provided another excellent crystal in DRO if the pump power is low. From the efficiency curves, we can obviously see that it has the fittest length of crystal and the power of pump if the other condition is determined. We also calculated the threshold and efficiency curves with the crystal length, pump power, wavelength of signal wave and mismatch etc on the Single Resonance Oscillator (SRO) of CLBO. The most obviously difference of DRO and SRO is that when the pump power is higher and the crystal length is longer, the efficiency curves become smooth but not descend in comparing SRO to that of DRO.