Reflective liquid crystal polarization gratings with wide angle and high diffraction efficiency

A highly diffraction efficiency reflective liquid crystal polarization grating (LCPG) was fabricated by employing two orthogonally circularly polarized beams with a 266 nm laser. The reflective LCPG sample works at the wavelength of 1064 nm. The diffraction efficiency of the reflective LCPG sample was evaluated using hand-polarized light at 1064 nm laser. It was shown that a remarkable diffraction efficiency of 97.4% was achieved when the beam was incident normally. Moreover, the diffraction efficiency remained above 90% within the incident range of ±20°. Subsequently, we conducted the laser damage test on the reflective LCPG using nanosecond pulses at 1064 nm generated by Nd:YAG laser. The test results indicated that laser induced damage threshold was 9.1 J/cm² (12 ns). This research provides valuable insights into design and fabrication of reflective LCPGs. This device has potential applications such as laser radar, beam splitting and combining, spectral analysis, displacement sensor, raster projection display and high-intensity laser systems.本研究采用266纳米激光器输出的两束正交圆偏振光束，制备了一款高衍射效率的反射式液晶偏振光栅（liquid crystal polarization grating, LCPG）。该反射式LCPG样品的工作波长为1064纳米。研究团队采用1064纳米波段的手动偏振光对该样品的衍射效率进行了表征，实验结果表明，当光束正入射时，其可实现97.4%的优异衍射效率。此外，在±20°的入射角度范围内，衍射效率始终保持在90%以上。后续，研究团队采用Nd:YAG激光器产生的1064纳米纳秒脉冲激光，对该反射式LCPG开展了激光损伤测试，测试结果显示其激光诱导损伤阈值（laser induced damage threshold）可达9.1 J/cm²（脉冲宽度12纳秒）。本研究为反射式LCPG的设计与制备提供了极具价值的参考思路，该器件在激光雷达、分束与合束、光谱分析、位移传感器、光栅投影显示以及强激光系统等领域具备潜在应用价值。

搜集汇总

背景与挑战

背景概述

该数据集聚焦于一种高衍射效率的反射式液晶偏振光栅（LCPG），通过使用266 nm激光和正交圆偏振光束制造，工作波长为1064 nm。在法向入射下，光栅的衍射效率达到97.4%，并在±20°的入射角度范围内保持90%以上，同时其激光诱导损伤阈值为9.1 J/cm²（12 ns）。该研究为反射式LCPG的设计和制造提供了重要见解，潜在应用于激光雷达、光束分合、光谱分析、位移传感器、光栅投影显示和高强度激光系统等领域。