放大的自发发射能为自适应光学产生强的laser引导星吗？
Can amplified spontaneous emission produce intense laser guide stars for adaptive optics?
摘要：
自适应光学（AO）是地基光学和红外天文学的关键技术之一，具有高角分辨率和灵敏度。采用激光导引星（LGS）的自适应光学系统可以获得高的天空覆盖率，但其性能受到LGS返回通量的限制。我们研究了两种可能产生高强度大气激光信标的新方法的潜力。放大的自发发射有可能提高高层大气中原子或分子物种的传统共振激发产生的信标的强度。这需要在光学厚度到受激发射的电子跃迁中产生粒子数反转。潜在的激发机制包括连续波泵浦、脉冲激发和等离子体产生。或者，高功率飞秒脉冲激光可以在大气层中产生白光超连续谱。这种光源的宽带辐射也有助于探测大气湍流的倾斜分量。
英文摘要：
Adaptive optics (AO) is a key technology for ground-based optical and infrared astronomy, providing high angular resolution and sensitivity. AO systems employing laser guide stars (LGS) can achieve high sky coverage, but their performance is limited by LGS return flux. We examine the potential of two new approaches that might produce high-intensity atmospheric laser beacons. Amplified spontaneous emission could potentially boost the intensity of beacons produced by conventional resonant excitation of atomic or molecular species in the upper atmosphere. This requires the production of a population inversion in an electronic transition that is optically-thick to stimulated emission. Potential excitation mechanisms include continuous wave pumping, pulsed excitation and plasma generation. Alternatively, a high-power femtosecond pulsed laser could produce a white-light supercontinuum high in the atmosphere. The broad-band emission from such a source could also facilitate the sensing of the tilt component of atmospheric turbulence.
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