Study on dynamic mode stability of external cavity diode lasers

GUO Haiping; WAN Chenhao; XU Chengwen; YAN Tuo; WANG Dongsheng

doi:10.7510/jgjs.issn.1001-3806.2016.05.018

In order to analyze the mode stability of an external cavity diode laser during the tuning process, its mode structure was deduced and simulated by using the original multiple-beam interference method. The optimal external-cavity length was derived under the condition of matching the grating angle tuning rate with the external cavity mode tuning rate during the grating rotation when the grating plane and pivot arm were not on the same plane. The range of mode stability, namely, mode hop during the tuning process, was also studied. The effect of the collimating lens location on the system back-coupling efficiency was analyzed by using the method of rigorous coupling theory and the ray transfer matrix. The results show that the back-coupling efficiency is up to 99%. Linewidth of diode laser with center wavelength of 780nm was narrowed extremely. Theoretical linewidth of external cavity diode cavity is 0.96% of that of diode laser without external cavity. Stable range of dynamic mode is up to 6.8nm.

Study on dynamic mode stability of external cavity diode lasers

Corresponding author: WAN Chenhao, wanchenhao@hust.edu.cn;

1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China

Received Date: 2015-06-23

Accepted Date: 2015-09-11

Available Online: 2016-09-25

Abstract: In order to analyze the mode stability of an external cavity diode laser during the tuning process, its mode structure was deduced and simulated by using the original multiple-beam interference method. The optimal external-cavity length was derived under the condition of matching the grating angle tuning rate with the external cavity mode tuning rate during the grating rotation when the grating plane and pivot arm were not on the same plane. The range of mode stability, namely, mode hop during the tuning process, was also studied. The effect of the collimating lens location on the system back-coupling efficiency was analyzed by using the method of rigorous coupling theory and the ray transfer matrix. The results show that the back-coupling efficiency is up to 99%. Linewidth of diode laser with center wavelength of 780nm was narrowed extremely. Theoretical linewidth of external cavity diode cavity is 0.96% of that of diode laser without external cavity. Stable range of dynamic mode is up to 6.8nm.

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Reference (17)

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Study on dynamic mode stability of external cavity diode lasers

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