空间光调制产生极高阶高纯高斯模
Generation of very high-order high purity Gaussian modes via spatial light modulation
摘要：
实验证明了利用市售的液晶空间光调制器（SLM）可以将1064 nm的$\text{TEM}_{00}$激光基模转换为任意阶的高阶厄米-高斯模（HG）。我们特别研究了$\text{HG}_{5,5}/\text{HG}_{10,10}/\text{HG}_{15,15}$模式。双镜平球腔在空间上滤除高阶模。利用三镜诊断腔对净化后的模式进行了分析，测得模式纯度分别为96/93/78%，转换效率分别为6.6/3.7/1.7%。所产生的高纯度厄米-高斯模可用于减轻光学钟和引力波（GW）探测器的光学腔中的镜热噪声。HG模式，然后转换成高阶LG模式，可以在冷原子物理特别感兴趣。
英文摘要：
We experimentally demonstrate the conversion of a fundamental $\text{TEM}_{00}$ laser mode at 1064\,nm to higher order Hermite-Gaussian modes (HG) of arbitrary order via a commercially available liquid crystal Spatial Light Modulator (SLM). We particularly studied the $\text{HG}_{5,5}/\text{HG}_{10,10}/\text{HG}_{15,15}$ modes. A two-mirror plano-spherical cavity filters the higher-order modes spatially. We analyze the cleaned modes via a three-mirror diagnosis cavity and measure a mode purity of 96/93/78\% and a conversion efficiency of 6.6\%/3.7\%/1.7\% respectively. The generated high-purity Hermite-Gaussian modes can be employed for the mitigation of mirror thermal noise in optical cavities for both optical clocks and gravitational wave (GW) detectors. HG modes are then converted into high order LG modes which can be of particular interest in cold atom physics.
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