Femtosecond Laser Micromachining of Cladding Waveguides in KTiOAsO₄ Crystal for Second‐Harmonic Generation

Abstract

Second‐harmonic generation (SHG) of green lasers generated in KTiOAsO4 (KTA) cladding waveguides fabricated by femtosecond laser direct writing (FsLDW) is reported. The minimum propagation loss of the fabricated waveguides is determined to be 2.39 ± 0.24 dB cm−1 at 1064 nm. The SHG performance is characterized by utilizing a 1064 nm pulsed laser. The maximum SHG conversion efficiency reaches 13.67%. This work suggests potential applications of KTA crystals and FsLDW technology in definition of compact waveguide devices for integrated nonlinear optics.

Study on the Rate of the Removal of Nano-Crystalline Diamond—Coated Materials by Femtosecond Laser Etching

“…Diamond is widely used in a variety of applications, including precision cutting tools, optical devices for microelectronic devices, and biological fields, due to its excellent properties, such as high hardness, high strength, high thermal conductivity, extremely high electron mobility, excellent optical properties, stable chemical properties, and good biocompatibility. As a result, there is a growing need for diamond to be processed with extreme precision [1][2][3].…”