标题：Femtosecond-laser-written superficial cladding waveguides in Nd:CaF2crystal
作者：Li, Rang ;Nie, Weijie ;Lu, Qingming ;Cheng, Chen ;Shang, Zhen ;zquez de Aldana, Javier R. ;Chen, Feng
作者机构：[Li, Rang ;Nie, Weijie ;Cheng, Chen ;Shang, Zhen ;Shang, Zhen ;Chen, Feng ] School of Physics, State Key Laboratory of Crystal Materials, Shandong Uni 更多
来源：Optics and Laser Technology
摘要：We report on the superficial cladding waveguides fabricated by direct femtosecond laser writing in Nd: CaF2crystal with three different groups of parameters. The lowest propagation loss of waveguides has been determined to be 0.7 dB/cm at wavelength of 632.8 nm along TE polarization. The near fundamental modal distributions have been imaged through the end-face coupling technique. The guidance of the waveguides is found to possess low sensitivity on polarization of the probe light. By using a confocal microscope system, the micro-photoluminescence mappings and micro-fluorescence spectra are also obtained, which indicates the photoluminescence features of the Nd3+ions are well preserved in the waveguide cores after direct femtosecond laser writing.
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