Ultrafast laser inscription of mid-IR directional couplers for stellar interferometry.
Ultrafast laser inscription of mid-IR directional couplers for stellar interferometry.
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DOI：
10.1364/ol.39.004820
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发表时间：
2014-08
期刊：
影响因子：
3.6
通讯作者：
A. Arriola;Sebabrata Mukherjee;D. Choudhury;L. Labadie;R. Thomson
中科院分区：
文献类型：
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作者：
A. Arriola;Sebabrata Mukherjee;D. Choudhury;L. Labadie;R. Thomson
报道了四端口倏逝场定向耦合器的超快激光加工和中红外（3.39 μm）特性。使用1030 nm光的亚皮秒激光脉冲在商业镓镧硫化物玻璃衬底中制造耦合器。采用最佳工艺参数制备的直波导的传输损耗为10.8dB·cm（-1）。一系列耦合器被刻上了不同的相互作用长度，我们证明了8%和99%之间的功率分配比的中红外光的波长为3.39 μm。这些结果清楚地表明，超快激光刻写可以用来制造高质量的倏逝场耦合器，用于未来的天文干涉测量。
We report the ultrafast laser fabrication and mid-IR characterization (3.39 μm) of four-port evanescent field directional couplers. The couplers were fabricated in a commercial gallium lanthanum sulfide glass substrate using sub-picosecond laser pulses of 1030 nm light. Straight waveguides inscribed using optimal fabrication parameters were found to exhibit propagation losses of ∼0.8 dB·cm(-1). A series of couplers were inscribed with different interaction lengths, and we demonstrate power-splitting ratios of between 8% and 99% for mid-IR light with a wavelength of 3.39 μm. These results clearly demonstrate that ultrafast laser inscription can be used to fabricate high-quality evanescent field couplers for future applications in astronomical interferometry.