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首页> 外文会议>Conference on Lidar Remote Sensing for Environmental Monitoring IV; Aug 3-4, 2003; San Diego, California, USA >Efficient all solid-state UV source for satellite-based lidar applications
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Efficient all solid-state UV source for satellite-based lidar applications

机译：适用于基于卫星的激光雷达应用的高效全固态紫外线源

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A satellite-based UV-DIAL measurement system would allow continuous global monitoring of ozone concentration in the upper atmosphere. However such systems remain difficult to implement because aerosol-scattering return signals for satellite-based lidars are very weak. A suitable system must produce high-energy UV pulses at multiple wavelengths with very high efficiency. For example, a nanosecond system operating at 10 Hz must generate approximately 1 J per pulse at 308-320 nm. An efficient space-qualified wavelength-agile system based on a single UV source that can meet this requirement is probably not available using current laser technology. As an alternative, we're pursuing a multi-source approach employing all-solid-state modules that individually generate 308-320 nm light with pulse energies in the range of 50-200 mJ, with transform-limited bandwidths and good beam quality. Pulses from the individual sources can be incoherently summed to obtain the required single-pulse energy. These sources use sum-frequency mixing of the 532 nm second harmonic of an Nd:YAG pump laser with 731-803 nm light derived from a recently-developed, state-of-the-art, nanosecond optical parametric oscillator. Two source configurations are under development, one using extra-cavity sum-frequency mixing, and the other intra-cavity sum-frequency mixing. In either configuration, we hope to obtain sum-frequency mixing efficiency approaching 60% by carefully matching the spatial and temporal properties of the laser and OPO pulses. This ideal balance of green and near-IR photons requires an injection-seeded Nd:YAG pump-laser with very high beam quality, and an OPO exhibiting unusually high conversion efficiency and exceptional signal beam quality. The OPO employs a singly-resonant high-Presnel-number image-rotating self-injection-seeded nonplanar-ring cavity that achieves pump depletion > 65% and produces signal beams with M~2 ≈ 3 at pulse energies exceeding 50 mJ. Pump beam requirements can be met in the laboratory using a commercial Nd:YAG laser system, but only after extensive modifications.
机译：基于卫星的UV-DIAL测量系统将允许对高层大气中的臭氧浓度进行连续的全球监测。但是，由于基于卫星的激光雷达的气溶胶散射返回信号非常弱，因此此类系统仍然难以实施。合适的系统必须以非常高的效率产生多个波长的高能紫外线脉冲。例如，工作在10 Hz的纳秒系统必须在308-320 nm的每个脉冲产生大约1 J的能量。使用当前的激光技术可能无法获得基于满足此要求的基于单个紫外线光源的有效空间限定波长捷变系统。作为替代方案，我们正在寻求一种采用全固态模块的多源方法，该模块可以单独产生308-320 nm的光，脉冲能量在50-200 mJ的范围内，具有有限的转换带宽和良好的光束质量。来自各个源的脉冲可以不相干地求和以获得所需的单脉冲能量。这些光源使用Nd：YAG泵浦激光器的532 nm二次谐波与731-803 nm光的总和频率混合，该光来自最近开发的最新的纳秒级光学参量振荡器。正在开发两种信号源配置，一种使用腔外和频混合，另一种使用腔内和频混合。无论采用哪种配置，我们都希望通过仔细匹配激光和OPO脉冲的时空特性，获得接近60％的和频混合效率。要实现绿色和近红外光子的理想平衡，就需要具有极高光束质量的注入种子Nd：YAG泵浦激光器，以及具有异常高转换效率和出色信号光束质量的OPO。 OPO使用单谐振高Presnel数旋转自注入种子的非平面环腔，泵浦损耗> 65％，并在脉冲能量超过50 mJ时产生M〜2≈3的信号束。泵浦光束的要求可以在实验室中使用商业化的Nd：YAG激光系统来满足，但必须经过大量修改。

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