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Femtosecond laser fabrication of phase-shifted Bragg grating waveguides in fused silica

机译:飞秒激光在熔融石英中制造相移布拉格光栅波导

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摘要

Phase-shifted Bragg grating waveguides (PSBGWs) were formed in bulk fused silica glass by femtosecond laser direct writing to produce narrowband (22 +- 3) pm filters at 1550 nm. Tunable pi and other phase shifts generated narrow passbands in controlled positions of the Bragg stopband, while the accurate placement of multiple cascaded phase-shift regions yielded a rectangular-shaped bandpass filter. A waveguide birefringence of (7.5 +- 0.3) X 10~(-5) is inferred from the polarization-induced spectral shifting of the PSBGW narrowband filters.
机译:通过飞秒激光直接写入在大块熔融石英玻璃中形成相移布拉格光栅波导(PSBGW),以产生1550 nm的窄带(22 + -3)pm滤光片。可调的pi和其他相移在布拉格阻带的受控位置产生了窄通带,而多个级联相移区域的精确放置产生了矩形带通滤波器。从偏振引起的PSBGW窄带滤波器的光谱偏移推断出(7.5 +-0.3)X 10〜(-5)的波导双折射。

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