Efficient 494 mW sum-frequency generation of sodium resonance radiation at 589 nm by using a periodically poled Zn:LiNbO_3 ridge waveguide

Abstract

A solid-state-laser based single-frequency 589 nm light source that can be easily used in the laboratory is needed for sodium spectroscopy studies and cold sodium atom experiments. This paper shows that by using a periodically poled Zn-doped LiNbO(3) ridge waveguide for sum-frequency generation, we can obtain a high conversion efficiency to 589 nm light from two sub-watt 1064 and 1319 nm Nd:YAG lasers via a simple single pass wavelength conversion process without employing an enhancement cavity. A 494 mW light at 589 nm is generated and achieves overall conversion efficiency from the laser power of 41%. Excellent long-term stability of output power is obtained and its standard deviation is characterized to be 0.09%.

Second harmonic generation at 399 nm resonant on the ^1S_0−^1P1 transition of ytterbium using a periodically poled LiNbO_3 waveguide

“…A PPLN waveguide is therefore attractive for developing a compact and robust laser system at 399 nm. Our previous reports regarding a single-pass PPLN waveguide include the generation of a 589-nm light with a power of 494 mW [38] and a 461-nm light with a power of 76 mW [39]. In the present work, an output power of 25 mW is generated at 399 nm when a fundamental power of 380 mW is coupled to the PPLN waveguide.…”

“…The obtained SHG light was separated from the residual fundamental light using an interference filter. The PPLN waveguide was housed in a module package, a picture of which is shown in [38]. The temperature of the metal base of the PPLN waveguide was monitored with a thermistor and controlled at < 0.01 • C with a Peltier device to meet the phase matching condition.…”

Efficient third harmonic generation of a CW-fibered 1.5 µm laser diode

“…The full width at half maximum of this curve is 160 pm. As it is often reported elsewhere, experimental data deviate from the theoretical squared sine cardinal (sinc 2 ) shape and show a strong asymmetry [20,[25][26][27]. This results from inhomogeneity of the polling period or of the geometry or the index of the guide (thermal distribution, doping concentration inhomogeneity, etc.)…”

Sodium temperature lidar based on injection seeded Nd:YAG pulse lasers using a sum-frequency generation technique

“…One of the best solutions for generating a 589 nm resonance light is a Nd:YAG laser. The sum frequency generation (SFG) of a 589 nm coherent light has been demonstrated with two Nd:YAG lasers operating at 1064 and 1319 nm [6,7]. This technique has already been applied to laser guide star adaptive optics [8], but most lasers are still continuous wave (cw) types and they are untested and require a radically different approach to obtaining altitude and spectral information.…”