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Volume 12
Issue 4
10.3390/photonics12040293
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Communication

Precisely Tunable 780 nm External Cavity Diode Laser

by
Baoni Han
1,
Yuanlin Shi
1,
Xu Tang
1,
Jing Li
1,
Chenggang Guan
2,*,
Junzhu Ye
3,* and
Rongxu Shen
2
1
Xi’an Institute of Space Radio Technology, Xi’an 710100, China
2
Wuhan Accelink Technologies Co., Ltd., Wuhan 430074, China
3
Laboratory of Optoelectronics and Sensor (OES Lab), School of Science, Hubei University of Technology, Wuhan 430068, China
*
Authors to whom correspondence should be addressed.
Photonics 2025, 12(4), 293; https://doi.org/10.3390/photonics12040293
Submission received: 9 February 2025 / Revised: 25 February 2025 / Accepted: 18 March 2025 / Published: 21 March 2025
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Abstract

State-of-the-art research on narrow-linewidth external cavity semiconductor lasers has provided limited discussion on the capability of continuous wavelength tuning. In this study, we present a 780 nm tunable external cavity diode laser (ECDL) with narrow linewidth. An angle-adjustable interference filter (IF) is employed as the mode-selection element, enabling a wide wavelength tuning range. Precise, mode-hop-free continuous tuning is achieved through a combination of current modulation and piezoelectric ceramic transducer (PZT) control, with a tuning accuracy of 1.65 pm/mA. Experimental optimization of the interference filter external cavity diode laser (IF-ECDL) operating conditions resulted in a narrow linewidth of 55 kHz and a high output power of 51 mW. Furthermore, by integrating current and PZT tuning, continuous wavelength tuning of the IF-ECDL output is demonstrated over a specified range.
Keywords: external cavity diode laser; interference filter; mode-hop-free tuning external cavity diode laser; interference filter; mode-hop-free tuning

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MDPI and ACS Style

Han, B.; Shi, Y.; Tang, X.; Li, J.; Guan, C.; Ye, J.; Shen, R. Precisely Tunable 780 nm External Cavity Diode Laser. Photonics 2025, 12, 293. https://doi.org/10.3390/photonics12040293

AMA Style

Han B, Shi Y, Tang X, Li J, Guan C, Ye J, Shen R. Precisely Tunable 780 nm External Cavity Diode Laser. Photonics. 2025; 12(4):293. https://doi.org/10.3390/photonics12040293

Chicago/Turabian Style

Han, Baoni, Yuanlin Shi, Xu Tang, Jing Li, Chenggang Guan, Junzhu Ye, and Rongxu Shen. 2025. "Precisely Tunable 780 nm External Cavity Diode Laser" Photonics 12, no. 4: 293. https://doi.org/10.3390/photonics12040293

APA Style

Han, B., Shi, Y., Tang, X., Li, J., Guan, C., Ye, J., & Shen, R. (2025). Precisely Tunable 780 nm External Cavity Diode Laser. Photonics, 12(4), 293. https://doi.org/10.3390/photonics12040293

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