The artificial laser guide star (LGS) is generated by irradiating the middle layer with a 589 nm laser at an altitude of 90 km to excite the sodium atomic layer, which is a key process for astronomical AO applications. The artificial beacons were placed near the astronomical target under study and were susceptible to similar atmospheric disturbances and provided a path based on AO image correction. As improved LGS brightness also improves AO results, researchers are using the brightness enhancement technique as a circular polarization and a Larmor-frequency pulsed laser to achieve the goal of mitigating the effect of the geomagnetic field or by a simpler This is a method called polarization switching, developed jointly by researchers at Shanghai Institute of Optics and Fine Mechanics (SIOM) and the Chinese Academy of Sciences. A commercially available photonic phase modulator was used and the laser's polarization was aligned at 45 [deg.] To the optical axis of the electro-optic crystal while a voltage was applied to the crystal to switch between left and right circular polarizations at a Larmor frequency of about 100 kHz Laser, a variable phase delay that alternates between? / 2 and +? / 2 can be generated. This "magnetic resonance pumping" method uses an optical module that can be retrofitted to any existing or future continuous wave (CW) LGS laser and minimizes most of the astronomical observation angles (about 60 ° -90 °) return flux increased by 50%, as shown in Figure 1.
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Polarization switching improves the brightness of the laser guide star