A very compact explosive vapor sensor is demonstrated based on a distributed feedback polymer laser pumped by a commercial InGaN light‐emitting diode. The laser shows a two‐stage turn on of the laser emission, for pulsed drive currents above 15.7 A. The ‘double‐threshold’ phenomenon is attributed to the slow rise of the ∼30 ns duration LED pump pulses. The laser emits a 533 nm pulsed output beam of ∼10 ns duration perpendicular to the polymer film. When exposed to nitroaromatic model explosive vapors at ∼8 ppb concentration, the laser shows a 46% change in the surface‐emitted output under optimized LED excitation.

中文翻译：

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用于炸药的 LED 泵浦聚合物激光传感器。


基于商用 InGaN 发光二极管泵浦的分布式反馈聚合物激光器，展示了一种非常紧凑的爆炸性蒸汽传感器。对于高于 15.7 A 的脉冲驱动电流，激光器显示出激光发射的两级开启。“双阈值”现象归因于约 30 ns 持续时间的 LED 泵浦脉冲的缓慢上升。激光器发射垂直于聚合物薄膜、持续时间约 10 ns 的 533 nm 脉冲输出光束。当暴露于浓度约为 8 ppb 的硝基芳香族模型爆炸性蒸气时，在优化的 LED 激发下，激光器的表面发射输出发生了 46% 的变化。