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Abstract:A diode-side-pumped actively Q-switched Nd:YAG/SrWO4 intracavity Raman laser has been demonstrated, in which a Nd:YAG module is used as the fundamental laser source and a SrWO 4 crystal is used as the Raman active medium to generate first-Stokes laser at 1180 nm. A convexplane cavity is employed to make the laser in a stable and efficient work under high pump power. At a LD pump power of 164 W and a pulse repetition frequency of 20 kHz, an average output power of 10.5 W at 1180 nm is obtained.Typical oscilloscope traces for the fundamental and Raman pulses

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Subject classification: 42.55.Px; 78.20.Ci; S10.15Nd-doped yttrium aluminum borate, Nd x Y 1--x Al 3 (BO 3 ) 4 (NYAB), with large sizes and good optical quality has been grown by the flux method. When the Judd-Ofelt (JO) theory of parity-forbidden electric-dipole transitions of rare earth ions on non-centrosymmetric sites was applied to NYAB, it resulted in a good fit on absorption of the crystal. According to the JO theory, the fitted intensity parameters W t (t ¼ 2, 4, and 6) were calculated as 2.19 Â 10 --20 , 1.97 Â 10 --20 , and 3.10 Â 10 --20 cm 2 , respectively, with a root mean square deviation of 1.22 Â 10 --21 cm 2 . The emission properties of the excited 4 F 3/2 state have been studied, and the spectral parameters of NYAB crystal were compared with those of Nd x Gd 1--x Al 3 (BO 3 ) 4 (NGAB) crystal. A cw NYAB laser at 1.06 mm end-pumped by a high-power diode laser array has been demonstrated. A maximum output of 3.2 W at 1.06 mm has been achieved with an optical conversion efficiency of 29.1% and an average slope efficiency of 37.5%. It is found that these results approach those of Nd : YVO 4 crystal.

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