Laser Journal, Volume. 45, Issue 7, 42(2024)

PPLN green frequency doubling light source pumped by tunable DFB laser

BAI Sisi1, QUE Tianxing1, LI Jingru2, LIAN Shuang1, and JIANG Peipei1、*
Author Affiliations
  • 1School of Ophthalmology & Optometry, Wenzhou Medical University, Wenzhou Zhejiang 325035, China
  • 2Equipment Department, Li Huili Hospital of Ningbo Medical Center, Ningbo Zhejiang 315046, China
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    To develop a high repetition rate nanosecond narrow-pulse light source with with pulse width, repetition frequency and output power tunable to the single-photon level for the visible wavelength with high repetition frequency, a green frequency-doubling light source design based on a gain-modulated DFB laser and a PPLN crystal is proposed. The DFB laser is driven by a homemade nanosecond high-speed driver circuit in a pulsed mode to generate a fixed-wavelength pump source; using a fiber optic semiconductor attenuator to adjust the attenuation amount and modulate the intensity of pump light; using PPLN crystal as a nonlinear crystal material, a quasi phase matched green frequency doubling laser output was obtained through its tunable properties. The experimental results show that the pump power and center wavelength of the gain modulated DFB laser are stable, with a pulse width of 1.02~10.25 ns and an operating frequency of 1 Hz~10 MHz that can be continuously and independently adjusted. When the power of pump light decays to -44.61 dB, the average photon number of the green frequency doubling light output pulse is about 384N, and the conversion efficiency of the frequency doubling light to light is 9.3%.

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    BAI Sisi, QUE Tianxing, LI Jingru, LIAN Shuang, JIANG Peipei. PPLN green frequency doubling light source pumped by tunable DFB laser[J]. Laser Journal, 2024, 45(7): 42

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    Paper Information

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    Received: Dec. 14, 2023

    Accepted: Dec. 20, 2024

    Published Online: Dec. 20, 2024

    The Author Email: Peipei JIANG (jiangpp@wmu.edu.cn)

    DOI:10.14016/j.cnki.jgzz.2024.07.042

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