Direct-writing of cladding waveguide in PMNPT crystal by femtosecond laser micromachining

Abstract

In this work, the depressed cladding waveguide in PMN-PT crystal is fabricated by using a femtosecond laser with a central wavelength of 800 nm for the first time. The result of the confocal micro-Raman shows the change of Raman signal in each region. When coupling a laser at 980 nm into the depressed cladding waveguide in the PMN-PT sample, the output characteristics with temperatures under TM and TE polarizations are also explored, and the result shows that the insertion loss under TM polarization is only 1.33 dB at 50 °C.