R&D Institute <>, MoscowIn present research we investigated laser performance of Czochralski-grown CeSc3(B03)4 (CSB) crystals' with high levels of neodymium concentration 25 at.% and 20 at.%. For our experiments Nd:CSB bulks were fabricated 1.5x1.5 mm in pumping axes by 10 mm long. Quasi-CW laser diode 1-cm array with peak power up to 50 W manufactured by R&D Institute "Polyus" was used to pump Nd:CSB-crystal. The pump was close coupled to the polished side of the bulk (Fig. 1). Our experiments were carried with resonator consisted of a 20 cm concave high reflector and a flat output coupler separated by 12 cm, the calculated TEM00 diameter at the l/e2-intensity value was 0.13 mm. Q-switch Output mirror Ri '7 I---Array Heat Fig.1: Layout of the Q-switched Nd:CSB-laser.
PMWe measured Nd:CSB laser output versus pumping energy in 200-tsec-1ong pulses using output couplers with different transmissions 7, 12 and 24 at.% near 1 .0625 tm. Under the most effective performance conditions Nd:CSB (25 at.%) and Nd:CSB (20 at.%) lasers output of about 2 mJ per pulse with an optical efficiency of 22% was demonstrated (Fig.2,a and b). Nd:CSB (25 at.%) laser output was TEM00, because of the overlap of pump light and fundamental mode was better than for other modes case2 (Fig.3,a). But output of Nd:CSB (20 at.%) laser was more effective for beam consisted of higher transverse modes (Fig.3,b). Maximum output 1 .0625 tm pulse energy was observed when laser-diode output was at near 801 .5 nm -for Nd:CSB (25 at.%) crystal, and at near 806.5 nm -for Nd:CSB (20 at.%) crystal. Stability ofNd:CSB (25 at.%) laser output was of 10% according to environment temperature varying of 5°C (Fig.4). Comparison of fundamental mode operated diode-laser side-pumped Nd:YAG and Nd:CSB (25 at.%) lasers showed that the second is sufficiently more effective than the first one (Fig.5).In Q-switched operation of Nd:CSB (25 at.%) an output of 220 tJ in a 30 ns (FWHM) a TEM00 -mode pulse was obtained using GSGG:Cr3 saturable absorber with a small signal transmission of about 80% in a 20 cm concave-flat resonator. SPIE Vol. 3682 • 0277-786X1981$10.00 1 00%-mirror Nd: CSB-etement f-I4_I-I I 1 ;I Sink Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/22/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx Acknowledgments: This work was supported by ISTC under the project #25 1 -96.
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