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首页> 外文会议>Advancements in Adaptive Optics pt.1 >Sky Tests of a Laser-pumped Sodium Guidestar With and Without Beam Compensation
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Sky Tests of a Laser-pumped Sodium Guidestar With and Without Beam Compensation

机译：带有和不带有光束补偿的激光泵浦式钠导星的天空测试

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Three sets of sky tests have been conducted at the Starfire Optical Range with a continuous-wave, single-frequency, 20-W laser in preparation for a 50-W facility-class laser. Brightness measurements were made of the sodium guidestar produced with and without adaptive optics (AO) correction to the outgoing laser beam when it was either linearly or circularly polarized. Correcting for the transmission of our V filter at the sodium wavelength, a circularly polarized laser beam of 12 W out the telescope produced a guidestar of V=7.1 (1015 ph/s/cm~2 at the top of the telescope). In general, a circularly polarized beam produces a guidestar between 75 and 100% brighter than a linearly polarized beam, indicating a significant degree of optical pumping of the sodium D2-line magnetic sublevels. However, guidestars produced with beams launched with tip-tilt correction only were 11% brighter than with beams launched with full AO correction. From deconvolved images of the guidestar taken with the 3.5-m telescope, the smallest spot, produced from a beam with 8.5 W of power out the telescope, circular polarization, and launched closed loop, had a Gaussian FWHM of 0.85 arcsec, or 38 cm at an altitude of 92 km. This corresponds to a peak Gaussian intensity of 3.8 mW/cm~2.
机译：在Starfire光学靶场上，使用连续波，单频20W激光器进行了三组天空测试，以准备使用50W设施级激光器。对线性和圆偏振的出射激光束进行或不经过自适应光学（AO）校正后产生的钠导星，进行亮度测量。为了校正我们的V滤光片在钠波长下的透射率，从望远镜射出的12 W圆偏振激光束产生的导星为V = 7.1（望远镜顶部为1015 ph / s / cm〜2）。通常，圆偏振光束产生的导星比线性偏振光束亮75至100％，表明钠D2线磁性子能级的光泵浦程度很高。但是，使用倾斜修正光束发射的导星比使用完全AO校正光束发射的导星要亮11％。从使用3.5米望远镜拍摄的引导星的反卷积图像中，最小的光斑是由望远镜发出的8.5 W功率光束产生的，圆偏振并产生了闭环，其高斯FWHM为0.85 arcsec或38 cm在92公里的高度这对应于3.8 mW / cm〜2的峰值高斯强度。

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