Diode laser using narrow bandwidth interference filter at 852 nm and its application in Faraday anomalous dispersion optical filter

Jiang Zhaojie¹, Zhou Qi², Tao Zhiming^{1, 3}, Zhang Xiaogang¹, Zhang Shengnan¹, Zhu Chuanwen¹, Lin Pingwei⁴, Chen Jingbiao^{1, †,}

Beat signal between two identical external cavity lasers. The sweep time of spectrum analyzer is 10 ms, the resolution bandwidth is 30 kHz, and the video bandwidth is 30 kHz. The FWHM of Lorentzian fit is 40 kHz, and the Gaussian fit is 48.9 kHz. The inset shows the magnified Gaussian fits curve.