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首页> 美国卫生研究院文献>Scientific Reports >Efficient Second Harmonic Generation in 3D Nonlinear Optical-Lattice-Like Cladding Waveguide Splitters by Femtosecond Laser Inscription
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Efficient Second Harmonic Generation in 3D Nonlinear Optical-Lattice-Like Cladding Waveguide Splitters by Femtosecond Laser Inscription

机译：飞秒激光题字在3D非线性光学晶格状包层波导分束器中高效产生第二谐波

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Integrated photonic devices with beam splitting function are intriguing for a broad range of photonic applications. Through optical-lattice-like cladding waveguide structures fabricated by direct femtosecond laser writing, the light propagation can be engineered via the track-confined refractive index profiles, achieving tailored output beam distributions. In this work, we report on the fabrication of 3D laser-written optical-lattice-like structures in a nonlinear KTP crystal to implement 1 × 4 beam splitting. Second harmonic generation (SHG) of green light through these nonlinear waveguide beam splitter structures provides the capability for the compact visible laser emitting devices. With Type II phase matching of the fundamental wavelength (@ 1064 nm) to second harmonic waves (@ 532 nm), the frequency doubling has been achieved through this three-dimensional beam splitter. Under 1064-nm continuous-wave fundamental-wavelength pump beam, guided-wave SHG at 532 nm are measured with the maximum power of 0.65 mW and 0.48 mW for waveguide splitters (0.67 mW and 0.51 mW for corresponding straight channel waveguides), corresponding to a SH conversion efficiency of approximately ~14.3%/W and 13.9%/W (11.2%/W, 11.3%/W for corresponding straight channel waveguides), respectively. This work paves a way to fabricate compact integrated nonlinear photonic devices in a single chip with beam dividing functions.
机译：具有光束分离功能的集成光子器件吸引了广泛的光子应用。通过直接飞秒激光写入制造的类似于光栅的包层波导结构，可以通过轨道限制的折射率分布图设计光传播，从而实现定制的输出光束分布。在这项工作中，我们报告了在非线性KTP晶体中制造3D激光写入的类似光栅的结构，以实现1××4的分束。通过这些非线性波导分束器结构的绿光的二次谐波产生（SHG）为紧凑的可见激光发射器件提供了能力。通过将基本波长（@ 1064 nm）与二次谐波（@ 532 nm）的II型相位匹配，可以通过此三维分束器实现倍频。在1064 nm连续波基波泵浦光束下，测得的532 guidednm导波SHG的最大功率对于波导分路器为0.65 µmW和0.48 µmW（对于相应的直通道波导为0.67 µmW和0.51 µmW），对应于SH转换效率分别约为〜14.3％/ W和13.9％/ W（对于相应的直通道波导，分别为11.2％/ W，11.3％/ W）。这项工作为在具有分束功能的单芯片中制造紧凑的集成非线性光子器件铺平了道路。

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