We report on two types of Raman laser sources emitting in the near and middle ultraviolet spectral ranges by the use of a solarization-resilient gas-filled inhibited-coupling (IC) hollow-core photonic-crystal fiber (HCPCF) with record low transmission loss (minimum of 5 dB/km at 480 nm). The first source type emits a Raman comb generated in a hydrogen-filled HCPCF pumped by a 355 nm wavelength microchip nanosecond pulsed laser. The generated comb lines span from 270 nm to the near-infrared region with no less than 20 lines in the 270–400 nm wavelength range. The second type stands for the first dual-wavelength Raman source tuned to the ozone absorption band in the ultraviolet. Such dual-wavelength source emits at either 266 nm and 289 nm, or 266 nm and 299 nm. The relative power of the pair components is set to optimize the sensitivity of ozone detection in differential absorption lidar (DIAL). The source’s physical package represents more than 10-fold size-reduction relative to current DIAL lasers, thus opening new opportunities in on-field ozone monitoring and mapping. Both Raman sources exhibit a very small footprint and are solarization-free.

我们报告了两种类型的拉曼激光源在近紫外和中紫外光谱范围内发射，它们使用具有创纪录低传输损耗的日晒弹性充气抑制耦合 (IC) 空芯光子晶体光纤 (HCPCF) （在 480 nm 处最小为 5 dB/km）。第一种源类型发射由 355 nm 波长微芯片纳秒脉冲激光器泵浦的充满氢气的 HCPCF 中产生的拉曼梳。生成的梳状线跨越 270 nm 到近红外区域，在 270-400 nm 波长范围内有不少于 20 条线。第二种类型代表第一个双波长拉曼光源，调谐到紫外线中的臭氧吸收带。这种双波长光源在 266 nm 和 289 nm 或 266 nm 和 299 nm 处发射。设置成对组件的相对功率以优化差分吸收激光雷达 (DIAL) 中臭氧检测的灵敏度。与当前的 DIAL 激光器相比，光源的物理封装尺寸减小了 10 倍以上，从而为现场臭氧监测和绘图开辟了新的机会。两种拉曼光源的占地面积都非常小，并且没有日晒。