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The influence of femtosecond laser wavelength on waveguide fabrication inside glass

机译:飞秒激光波长对玻璃内部波导制造的影响

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We have investigated the permanent refractive index changes inside fused silica glass after laser inscription of waveguides using ultrashort laser pulses at different wavelengths. To this end the laser frequency was detuned using an optical parametric amplifier (OPA) combined with a confocal arrangement (for cleaning the laser Gaussian spatial profile). The suitability for waveguiding and the refractive index changes were inspected by measuring the near- and far-field output profiles of the laser-machined lines using a continuous wave laser at 660 run. Raman spectroscopy was performed both for tracks of damage and for good optical waveguides. The structural changes were inferred from peak shifts and relative intensity fluctuations associated with representative Raman bands. In fused silica, changes in the 605 cm~(-1) peak, which is due to 3-membered Si-0 ring structures, were monitored. Since the laser photon energy rules the order, k, of the multiphoton absorption in dielectrics, the role of the laser wavelength for waveguide fabrication will be discussed in terms of different powers of the laser intensity (I(r,z)~(k(λ))) and the Keldysh formalism for strong field ionization (W_(SFI)(λ.)).
机译:我们使用不同波长的超短激光脉冲对波导进行激光刻写后,研究了熔融石英玻璃内部的永久折射率变化。为此,使用光学参数放大器(OPA)和共焦装置(用于清洁激光高斯空间轮廓)将激光频率失谐。通过使用660 nm的连续波激光器测量激光加工线的近场和远场输出曲线,检查了波导的适用性和折射率变化。拉曼光谱法既用于检测损坏轨迹,又用于检测光波导。结构变化是根据与代表性拉曼谱带相关的峰位移和相对强度起伏推断的。在熔融石英中,监测了由于3元Si-0环结构而导致的605 cm〜(-1)峰的变化。由于激光光子能量决定了介电中多光子吸收的阶数k,因此将根据不同的激光强度(I(r,z)〜(k( λ)))和强场电离的Keldysh形式主义(W_(SFI)(λ。))。

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