Simultaneous phase matching of optical parametric oscillation and second-harmonic generation in aperiodically poled lithium niobate

Abstract

We report a simple ad hoc method for designing an aperiodic grating structure to quasi-phase match two arbitrary second-order nonlinear processes simultaneously within the same electric-field-poled crystal. This method also allows the relative strength of the two processes to be adjusted freely, thereby enabling maximization of the overall conversion efficiency. We also report an experiment that is based on an aperiodically poled lithium niobate crystal that was designed by use of our method. In this crystal, parametric oscillation and second-harmonic generation are simultaneously phase matched for upconversion of a femtosecond Ti:sapphire laser to 570 nm. This self-doubling optical parametric oscillator provides an experimental verification of our design method.

Nanosecond sum-frequency generating optical parametric oscillator using simultaneous phase matching

“…This technique has been demonstrated to provide efficient frequency conversion to wavelengths that cannot be reached via a single nonlinear process [7][8][9][10][11][12][13][14][15]. In particular, both femtosecond and continuous-wave Ti:sapphire laser beams were upconverted to visible wavelengths by combining sum-frequency generation (SFG) [10,11] or second-harmonic generation [11,13,14] with optical parametric oscillation.…”

Development of a new pulsed source for photoacoustic imaging based on aperiodically poled lithium niobate

“…In our case we require the domain structure to have two strong components, one at OPO k Δ and another at SFG k Δ . To design our crystals we followed a procedure similar to those described in Refs [6][7][8]. First we define a function…”

An efficient method for analyzing second harmonic generation with the consideration of pump depletion

“…Such structures provide a large degree of freedom in designing nonlinear optical devices. They possess the capability of flexibly adjusting the conversion efficiency of target wavelengths [2][3][4]. Some algorithms have been developed to find the optimal aperiodic QPM gratings with various objectives [2][3][4][5][6][7][8][9][10][11].…”