We report a widely tunable quasi-phase-matched optical parametric oscillator that uses periodically poled LiNbO(3)with a multigrating structure. The device is tuned by translation of the crystal through the resonator and pump beam, with no realignment needed. With a 1.064-microm acousto-optically Q-switched Nd:YAG pumplaser, we produced noncritically phase-matched tunable IR output from 1.36 to...

All-optical switching by using a nondegenerate cascaded second-order nonlinearity is described wherein a phase shift is induced at one frequency owing to the presence of intense light at a different frequency. A Mach-Zehnder waveguide device is proposed to take advantage of this process and has applications for all-optical switching and demultiplexing, potentially at power levels near 10 W by u...

A single-resonant low-threshold type-I β-Ba2BO4 (BBO) optical parametric oscillator (OPO) with tunable output from 410 nm to 630 at 5 kHz repetition rate is reported. By taking the noncollinear phase matching method, OPO operation could be obtained compared configuration of collinear matching, and maximum optical–optical conversion efficiency 11.8% was achieved 500 wavelength when 0.4 mJ pump p...

We report quasi-phase-matched second-harmonic generation in periodically poled lithium niobate (PPLN), where both fundamental and second-harmonic waves are ordinary waves. It provides a lower-limit value for d22 of 1.1 pm/V. The measured temperature and wavelength bandwidth of the second-harmonic signal are in good agreement with the theoretical predictions. Since the d22 = dYYY nonlinear coeff...

Herein, on the basis of expressions for refractive indices isonormal waves, possibility performing collinear phase matching optical parametric generation in arbitrary directions a biaxial KTA crystal under pumping by radiation YAG:Nd laser is analyzed. The tuning curves that determine range signal and idler type-I II-type phase-matching angles θ φ cases where carried out along angle at fixed vic...