Femtosecond Laser Micromachining of Cladding Waveguides in KTiOAsO4 Crystal for Second‐Harmonic Generation. Issue 11 (24th September 2021)

• Record Type: Journal Article
• Authors: Li, Genglin; Zhang, Bin; Sun, Lifei; Ren, Yingying; Jia, Yuechen; Chen, Feng
• Is Part Of: Physica status solidi. Volume 15:Issue 11(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-09-24
• Subjects: birefringent phase matching -- cladding waveguides -- femtosecond laser micromachining -- KTA nonlinear optical crystals -- second-harmonic generation; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.202100345
• Languages: English
• ISSNs: 1862-6254

Abstract

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. Abstract : Fabrication of KTiOAsO4 (KTA) cladding waveguides by femtosecond laser direct writing (FsLDW) is reported. The experimental results indicate that the fabricated cladding waveguides possess good waveguiding performance. The original nonlinear properties in KTA crystals are considerably enhanced within the waveguide volume, resulting in second‐harmonic generation (SHG) of the green laser (1064→532 nm) with a conversion efficiency of 13.67%.