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Thermally induced rupture of a nonlinear crystal is the primary limiting factor to the attainment of high average power (HAP) in an optical parametric oscillator (OPO). In this paper, HAP scaling behavior in an OPO is addressed in detail by combining thermally induced phase mismatching with thermally induced rupture. Expressions for the heat generation using a multi-pass model and thermally induced stress are derived and analyzed that can give directions for a HAP-OPO design. When an OPO generates the maximum average output power, the dependence of flaw size on thermo optical material parameters of nonlinear crystals is obtained that is very useful for surface processing, material selection, property improvements of a nonlinear crystal and new HAP nonlinear crystal development.

A compact green laser of 1.3 W output at 534.7 nm is generated by intracavity frequency doubling (ICFD) of a 49 edge-emitter laser bar using a MgO-doped (PPLN) bulk crystal. The measured M(2) values of green beam are 12.1 and 2.9 along the slow and fast axes, respectively. To our knowledge, this is the first demonstration of the ICFD of multi-edge-emitters laser bar.

The growing trend for laser-based projection displays makes intra-cavity frequency doubling (ICFD) of electrically and optically surface emitting diode lasers in the near IR region become more interesting [1–3]. In this letter, we demonstrate for the first time to our knowledge ICFD of an edge emitting laser diode using a periodically poled lithium niobate (PPLN) bulk crystal, which has the potential to be scalable to high production volumes and low costs with immense implication for industrial applications.

Seven output wavelengths ranged from violet to mid-infrared have been observed simultaneously from a optical parametric oscillator with a periodically poled lithium niobate crystal. The pump laser is diode-pumped Q-Switched Nd:YVO 4 laser with the wavelengths at 1064 nm. The turning output wavelengths can be obtained by changing the periods or temperatures of PPLN. The seven output wavelengths, corresponding to the sum frequency generation of the pump and the doubling signal ( 2ω s +ω p ), the third harmonic generation of the signal ( 3ω s ), the second harmonic generation of the pump (2ω p ), the sum frequency generation of the pump and the signal (ω s +ω p ), the second harmonic generation of the signal (2ω s ), the signal (ω s ) and the idler (ω i ), measured are 433, 488, 532, 616, 731, 1463 and 3902 nm, at the period of 28.7 μm with the temperature of 333 K. These data showed good agreement with those calculated by the Sellmeier equation. This phenomenon may find novel applications in photonic devices.

Fourth-harmonic generation of a Nd:YAG laser has been achieved with a conversion efficiency of 30.6% in a KBeBO3F2 crystal of thickness 1.8 mm. The acceptance angle at wavelength 532 nm has also been measured.

We demonstrate for the first time to our knowledge intra-cavity frequency doubling (ICFD) of an edge-emitter diode laser using a 10 mm-long 5.0 microm periodically poled LiNbO(3) (PPLN) crystal. An optical output power of 33 mW second harmonic blue light at 490.5 nm is generated at 1.0 A injection current, equivalent to an overall wall-plug efficiency of 1.8%. The measured M(2) values of blue beam are 1.7 and 2.4 along the fast and slow axis.