Journals >Acta Optica Sinica (Online)
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2025
Volume: 2 Issue 4
2 Article(s)
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Laser and Laser Physics
Orthogonally Polarized Dual-Frequency Er ∶ YAG Laser (Invited)
Yang Yu, Jiawen Xiao, Xianqing Zang, Yusong Jiao, and Chunqing Gao
We report an orthogonally polarized dual-frequency continuous-wave (CW) Er∶?YAG laser that can simultaneously output laser with wavelengths of 1617 nm and 1645 nm. Polarization beam splitter (PBS) prism and etalons are inserted into the cavity to generate an orthogonally polarized dual-frequency mode. The maximum outpuWe report an orthogonally polarized dual-frequency continuous-wave (CW) Er∶?YAG laser that can simultaneously output laser with wavelengths of 1617 nm and 1645 nm. Polarization beam splitter (PBS) prism and etalons are inserted into the cavity to generate an orthogonally polarized dual-frequency mode. The maximum output power of the S-polarized 1645 nm and the P-polarized 1617 nm lasers is 1.074 W and 0.242 W, respectively. We measure the longitudinal mode spectrum of the output laser using a Fabry?Perot (FP) interferometer and prove that the lasers at both wavelengths are single longitudinal mode. The M2 factors of the 1617 nm and 1645 nm lasers are 1.32 and 1.87 in the x direction and 1.38 and 2.06 in the y direction, respectively, and the frequency difference is 3.28 THz..
Acta Optica Sinica (Online)
- Publication Date: Feb. 25, 2025
- Vol. 2, Issue 4, 0406001 (2025)
Optics and Optoelectronic Materials
Ultra-Wideband Reconfigurable Intelligent Metasurface Design for Beam Reshaping and Radar Cross Section Reduction (Invited)
Yingjuan Lu, Qiang Cheng, Siran Wang, Huidong Li... and Jiang Luo|Show fewer author(s)
We propose an ultra-wideband reconfigurable intelligent surface (RIS) based on a dual-wing grooved symmetric structure. In our design, the grooves on both sides of the unit cell can effectively extend the current path and significantly improve the unit's broadband characteristics. We couple it with a high-precisionWe propose an ultra-wideband reconfigurable intelligent surface (RIS) based on a dual-wing grooved symmetric structure. In our design, the grooves on both sides of the unit cell can effectively extend the current path and significantly improve the unit's broadband characteristics. We couple it with a high-precision voltage-controlled driver circuit, and the proposed RIS can adjust the unit's electromagnetic response based on theoretical coding in real time, thus achieving precise electromagnetic wave control. Through our experiments, we find that the RIS achieves a 1 bit phase tuning range from 7.3 GHz to 13.9 GHz, with a relative bandwidth of 62.3%, covering the C, X, and Ku bands. Moreover, the RIS achieves radar cross section (RCS) reduction of more than 10 dB in the range of 7?14 GHz, and the reduction can reach up to 15 dB in most frequency bands, with the maximum reduction being 40 dB. Additionally, our experimental verification also confirms the RIS's capability to manipulate single beams, asymmetric dual beams, and multiple beams, which provides an important reference for the multi-band cooperative applications of RIS..
Acta Optica Sinica (Online)
- Publication Date: Feb. 25, 2025
- Vol. 2, Issue 4, 0401001 (2025)
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