Potassium lithium tantalate niobate, K3Li2(TaxNb1−x)5O15, or KLTN single crystals were grown by spontaneous crystallization method, and it has been demonstrated that the KLTN crystal has high potential as a nonlinear crystal for blue second-harmonic-generation (SHG) applications. Ta substitution for Nb site in K3Li2Nb5O15 crystal improves the transparency in the blue light region and decolorizes the material. Compared with K3Li2Nb5O15, the K3Li2Ta5O15 crystal exhibits a 60 nm blueshift of the absorption edge from 376 to 316 nm, and decreases its absorption coefficient from 2.3 to 0.3 cm−1 at 400 nm. The phase-matched frequency doubling of the Ti:sapphire infrared laser for blue SHG at room temperature has been demonstrated with the KLTN bulk crystal.

A stable micro second harmonic generation (SHG) laser consisting of a diode- pumped Nd:YVO4 laser doubled by KTiOPO4 achieves 3 times higher storage density than usual on an erasable optical disk.

We report a new configuration for an intracavity frequency-doubled Cr-doped LiSrAlF6 (Cr:LiSAF) solid state laser, by inserting a nonlinear crystal of LiB3O5 (LBO) for second harmonic generation (SHG). By applying a highiy reflective coating on LBO crystal, blue light of 67.8 mW was obtained. The slope efficiency of the Cr:LiSAF laser was 39.2% and the continuously tunable wavelength range by a birefringent filter was 113 nm.

0 4 0 6 0 8 1 1 2 1 4 Fundamental Output Capacity (W) ThA2 Fig. 3. Measured UV output vs. laser capacity of fundamental output. 477 nm and d,, = -2.2 d,(KDP), respectively.It can be easily grown in large size from its congruent melting with so-called top-seeding method. A 5-mm CLBO crystal is used for Type-I critically phasematched SHG at 800 nm in our experiment. Experimental results will be described in the meeting.

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