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Proceedings of the Adaptive Optics for Extremely Large Telescopes 5
The use of laser guide star (LGS) in daytime expands the operational time of telescope for AO instruments, especially for thermal infrared wavelengths, because the sky brightness is not so different from night to daytime. However, the daytime sky background at 589nm is about 10 6 times brighter than a bright night. However, as the bandwidth of sodium D2 line is a few GHz, an extremely narrow bandpass filter at this wavelength makes it possible to use LGSs during the day. Begin with developingdoi:10.26698/ao4elt5.0155 fatcat:kerabbvnrzev7asq4etipzhmdy