Experimental Study on Influence of Atmospheric Turbulence on Coherence of Dual-Frequency Laser

• Published in: Chinese physics letters Vol. 27; no. 8; pp. 88 - 91
• Main Author: 王升 杨苏辉 吴霞 赵长明 朱启海
• Format: Journal Article
• Language: English
• Published: IOP Publishing 01.08.2010
• Subjects: 单频激光器; 双频; 大气湍流; 实验; 干涉仪; 激光干涉条纹; 激光束; 相干性
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/27/8/084202

The influence of atmospheric turbulence on the coherence of a dual-frequency laser beam is studied experimentally. An atmospheric turbulence simulator is inserted in one arm of a Mach-Zehnder interferometer. A single frequency laser beam and a dual-frequency laser beam with a frequency difference of 100 MHz travel through the interferometer, respectively. The visibilities of the interference fringes of the single and dual-frequency laser beams under different turbulent forces are compared. When the turbulence becomes stronger, the visibilities of the interference pattern of the single frequency interferometer decrease more rapidly. This shows that the atmospheric turbulence has less influence on the coherence of the dual-frequency laser beam. The linewidths broadened by the turbulence are calculated with the Wiener-Khintchine theory.