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We report in the present paper the Yb3+-doped Y2Ca3B4O12 diode-pumped laser operation in both continuous-wave (cw) and passively Q-switched modes. The differential slopes of the cw output power are in the 22%–40% range under different experimental conditions. Continuous tuning of the laser wavelength is obtained in the 1020–1057 nm range, in agreement with the broad emission spectra. In pulsed regime the repetition rate occurs up to 1.6 kHz and pulse energies of 30–75 μJ with about 40 ns duration are obtained. [ABSTRACT FROM AUTHOR]

We have demonstrated two self-frequency conversions from the bifunctional laser and optical nonlinear GdAl3(BO3)4:Nd3+ crystal. For the first one, the laser operated in a dual-wavelength mode in the 4F3/2→4I11/2 (at 1062 nm) and 4F3/2→4I13/2 (at 1338 nm) channels, under a fixed wavelength pumping (at 747.7 nm) and with a fixed crystal orientation (28.5°). Then the self-sum frequency mixing 1/1062+1/1338→1/592 process occurred, leading to a weak yellow beam at 592 nm. In the second self-frequency conversion, the Nd3+:GdAl3(BO3)4 laser operated in a single wavelength mode at 1062 nm. Then the self-difference frequency mixing process 1/λP-1/1062=1/λI occurred at a 29.9° phase matching angle. The idler wavelength λI was tunable in the 2450–2600 nm range, due to the tunability of the λP pump wavelength. The highest yield was 0.12%. New Sellmeier formulas valid at least up to 2600 nm have been established. [ABSTRACT FROM AUTHOR]

We have demonstrated two self-frequency conversions from the bifunctional laser and optical nonlinear GdAl3(BO3)4:Nd3+ crystal. For the first one, the laser operated in a dual-wavelength mode in the 4F3/2→4I11/2 (at 1062 nm) and 4F3/2→4I13/2 (at 1338 nm) channels, under a fixed wavelength pumping (at 747.7 nm) and with a fixed crystal orientation (28.5°). Then the self-sum frequency mixing 1/1062+1/1338→1/592 process occurred, leading to a weak yellow beam at 592 nm. In the second self-frequency conversion, the Nd3+:GdAl3(BO3)4 laser operated in a single wavelength mode at 1062 nm. Then the self-difference frequency mixing process 1/λP-1/1062=1/λI occurred at a 29.9° phase matching angle. The idler wavelength λI was tunable in the 2450–2600 nm range, due to the tunability of the λP pump wavelength. The highest yield was 0.12%. New Sellmeier formulas valid at least up to 2600 nm have been established. [ABSTRACT FROM AUTHOR]

The authors report the passive Q switching of a diode pumped Yb:GdAl3(BO3)4 (Yb:GAB) laser. The slopes of the average output power are 25% and 39.5% under different experimental conditions. The repetition rates occur in the 1–4.5 kHz range and pulse energies of 125 and 165 μJ with about 30 ns duration are obtained. An experimental comparison with passively Q-switched Nd:GAB laser is provided. A theoretical analysis is performed. It is in reasonable agreement with the experimental data and it is shown to be a useful tool for predicting the optimization of the cavity parameters. [ABSTRACT FROM AUTHOR]

We demonstrate the simultaneous generation of the three basal red–green–blue colors from a lone GdAl[sub 3](BO[sub 3])[sub 4]:Nd[sup 3+] bi-functional laser and optical nonlinear crystal. The laser works in a dual-wavelength operation in the two [sup 4]F[sub 3/2]→[sup 4]I[sub 11/2] (near 1062 nm) and [sup 4]F[sub 3/2]→[sup 4]I[sub 13/2] (near 1338 nm) channels, under a fixed wavelength pumping (at 744.7 nm) and with a fixed crystal orientation. Red and green results from self-frequency doubling of the two laser channels, blue results of self-sum frequency mixing of the pump and the 1338 nm laser. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]

We combine inside a single noncentrosymmetric laser crystal, GdAl[sub 3](BO[sub 3])[sub 4]:Nd[sup 3+], a stimulated emission and two second-order nonlinearities in cascade. The first one self-doubles the 1062.8 nm Nd[sup 3+] laser emission corresponding to the [sup 4]F[sub 3/2]→[sup 4]I[sub 11/2] channel, despite the fact that it is not phase-matched. The second one can be phase-matched or not and mixes the laser wave and its second harmonic (SH) in order to produce the third harmonic (TH) at 354.3 nm. © 2004 American Institute of Physics. [ABSTRACT FROM AUTHOR]