Barh Ajanta, Pedersen Christian, Tidemand-Lichtenberg Peter
Opt Lett. 2017 Apr 15;42(8):1504-1507. doi: 10.1364/OL.42.001504.
In this Letter, we demonstrate efficient room temperature detection of ultra-broadband mid-wave-infrared (MWIR) light with an almost flat response over more than 1200 nm, exploiting an efficient nonlinear upconversion technique. Black-body radiation from a hot soldering iron rod is used as the IR test source. Placing a 20 mm long periodically poled lithium niobate crystal in a compact intra-cavity setup (>20 W CW pump at 1064 nm), MWIR wavelengths ranging from 3.6 to 4.85 μm are upconverted to near-infrared (NIR) wavelengths (820-870 nm). The NIR light is detected using a standard low-noise silicon-based camera/grating spectrometer. The proposed technique allows high conversion efficiency over a wider bandwidth without any need for a shorter crystal length. Different analytical predictions and numerical simulations are performed a priori to support the experimental demonstrations.
在本信函中，我们利用一种高效的非线性上转换技术，展示了在室温下对超宽带中波红外（MWIR）光的高效探测，其响应在超过1200纳米的范围内几乎呈平坦状。来自热烙铁棒的黑体辐射用作红外测试源。将一块20毫米长的周期性极化铌酸锂晶体置于紧凑的腔内装置中（1064纳米处的连续波泵浦功率>20瓦），波长范围为3.6至4.85微米的中波红外光被上转换为近红外（NIR）波长（820 - 870纳米）。使用标准的基于硅的低噪声相机/光栅光谱仪检测近红外光。所提出的技术在更宽的带宽上实现了高转换效率，而无需使用更短的晶体长度。事先进行了不同的分析预测和数值模拟，以支持实验演示。
