Research on the Superposition Evolution of Double Laguerre–Gaussian Modes Based on Astigmatic Mode Conversion
Lingmin Zhao,
Jingliang Liu,
Jiaxin Yuan,
Yongji Yu,
Guangyong Jin,
Xinyu Chen
Affiliations
Lingmin Zhao
Jilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, China
Jingliang Liu
Jilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, China
Jiaxin Yuan
Jilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, China
Yongji Yu
Jilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, China
Guangyong Jin
Jilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, China
Xinyu Chen
Jilin Key Laboratory of Solid Laser Technology and Application, College of Physics, Changchun University of Science and Technology, Changchun 130022, China
In this paper, the evolution of the beam from the double Hermite–Gaussian beam superposition state to the double Laguerre–Gaussian beam superposition state is realized based on the astigmatism conversion. Firstly, the tunable output of the double Hermite–Gaussian mode superposition state is realized by adjusting the off-axis pumping distance of the crystal. On this basis, an astigmatic mode converter is added to the back end of the resonant cavity output mirror. By utilizing it, the evolution from the double Hermite–Gaussian mode superposition state to the specific double Laguerre–Gaussian mode superposition state is realized. The evolution process of the double mode superposition state based on the astigmatic mode is analyzed theoretically. The light field change of the evolution process is demonstrated experimentally.
