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With a non-critically phase-matched high gray-trace resistance KTP (GTR-KTP) crystal, a high-power intracavity optical parametric oscillator (IOPO) emitting at the wavelength of 1.5 μm and pumped by a diode-side-pumped acousto-optically Q-switched Nd:YAG laser is experimentally demonstrated. At the frequency repetition rate of 6 kHz, the maximum average power of 6.36 W at signal wavelength 1570 nm with a pulse width of 9.94 ns is obtained from IOPO based on GTR-KTP, corresponding to a peak power of 107 kW and a single-pulse energy of 1.06 mJ, respectively. We have compared the GTR-KTP IOPO with common KTP IOPO using the same scheme. At the same cavity design, frequency repetition rate and pump condition, only 5.42 W average output power with pulse width 13.82 ns is obtained from IOPO based on common KTP. Besides the higher output power, the output stability of GTR-KTP IOPO is much better than that of common KTP OPO. The output instability of GTR-KTP IOPO is 0.83% versus 6.7% of the common KTP IOPO. [ABSTRACT FROM AUTHOR]

The intermittent oscillation of 1064 nm and 1342 nm was demonstrated in a diode-pumped doubly passively Q-switched Nd:YVO4/Cr4+:YAG/V3+:YAG laser for the first time to our best knowledge. By exploiting a three-mirror configuration and choosing appropriate reflectivity values for the two wavelengths on the output couplers, the dual-wavelength pulsed operation was obtained. The maximum dual-wavelength average output power was 428 mW, corresponding to an optical-to-optical conversion efficiency of 8.5%. The corresponding physical explanations for the intermittent oscillation as well as the related phenomena are also given in this paper. [ABSTRACT FROM AUTHOR]

In this paper, the output performances at 1331 nm in continuous-wave (CW) operation and the passive Q-switching regime of a Nd:Gd3Ga5O12(Nd:GGG) laser crystal have been investigated under pumping with diode lasers. A maximum CW output power of 1.5 W was reached at an incident pump power of 7.5 W; the overall optical-to-optical efficiency and the slope efficiency with respect to the pump power were 21.5% and 19.4%, respectively. The passive Q-switching regime was achieved with Co2+:LaMgAl11O19 (Co2+:LMA) saturable absorber (SA) crystals. A maximum average output power of 183 mW was recorded with a Co2+:LMA SA with initial transmission Ti of 90%. The pulse energy was 18.7 μJ and the pulse duration was 26.1 ns, which correspond to a pulse peak power of 0.7 kW. With a Co2+:LMA SA with Ti=81%, the average power decreased to 131 mW. However, the pulse energy increased to 21.4 μJ, the pulse duration was 16.4 ns and the pulse peak power increased to 1.3 kW. [ABSTRACT FROM AUTHOR]

An eye-safe, high-repetition-rate, single-resonant nanosecond intracavity optical parametric oscillator (IOPO), based on a non-critically phase-matched KTA crystal driven by a diode-end-pumped acousto-optically Q-switchedNd:YVO4 laser, was demonstrated for the first time to our knowledge. With an absorbed pump power of 11.3 W, 1.1 W average power and 2.5 ns pulse width at the signal (1534 nm) wavelength for 30-kHz repetition rate are synchronously achieved with the 25 mm long KTA crystal. The corresponding peak power and single pulse energy are estimated to be up to 14.7 kW and 36.7 μJ. The conversion efficiency from diode laser power to OPO signal output power was 9.8% and the corresponding slope efficiency was 15.4%. [ABSTRACT FROM AUTHOR]

We have demonstrated an efficient diode-pumped passively Q-switched Nd:YVO4 laser at 1342 nm by using an uncoated Co2+:LaMgAl11O19 (Co2+:LMA) crystal as the saturable absorber. With the absorbed pump power of 11.7 W, the pulse width could be as low as 42 ns, with a corresponding average output power of 580 mW. At around 40 kHz repetition rate, the energy of a single Q-switched pulse was estimated to be about 14.5 μJ and the peak power was 346 W. The passive Q switching operation for the Co2+:LMA in different polarization states was also investigated. [ABSTRACT FROM AUTHOR]