Second-harmonic generation at 421 nm using injection-locked GaAlAs laser array and KNbO3

Abstract

Significant improvement in frequency doubling efficiency of a cw output of a GaAlAs laser diode is described. Up to 0.72 mW of 421 nm power was generated by illuminating a KNbO3 crystal with a 270 mW diffraction-limited beam generated by an externally injection-locked laser diode array, operating in a single-mode and single-far-field lobe.

Characteristics of Sr+ ions in an RF trap

“…When this is done by controlling the laser injection current and temperature, the resulting output power of the fundamental mode is 46 mW.) The theoretical SHG output power is given by [13,14].…”

“…The a-cut 3 × 3 × 10 mm KNbO 3 crystal is placed at the center of a vacuum chamber in order to prevent condensation of moisture. The nonlinear coefficients of KNbO 3 crystals are 3 times as large as those of KTP crystals [13]. In order to obtain phase matching in the crystal, we mounted it on top of a Peltier element, which was placed in a slot cut into a copper heat sink.…”

Enhanced visible and mid-IR emissions in Er/Yb-codoped K0.5Na0.5NbO3 ferroelectric ceramics

“…Up-conversion PL is a nonlinear process in which the sequential absorption of two or more (incident) photons leads to an emission of photon with a shorter wavelength [2], for example, converting near-infrared (NIR) light to visible (Vis) light. The corresponding up-conversion materials have great potential for applications in displays, optical computing, integrated photonics, information processing, medical and biological fields [3][4][5]. To achieve up-conversion PL, lanthanide ions (Ln 3+ ) are commonly used as the activator when doped in the host.…”

Potassium niobate derived from a novel chemical solution

“…Potassium niobate (KNbO 3 ) is an important functional material, with excellent properties of high electrooptic and nonlinear optical coefficients, good photorefractive properties, and is of interest for applications in optical waveguides, frequency doublers and holographic storage system [1,2]. The crystal thin films have been widely studied.…”