Laser Journal, Volume. 45, Issue 1, 33(2024)
1554.8 nm frequency doubler based on MgO: PPLN crystal
To meet the light source requirement for image positioning of the lightning imager on board the Fengyun-4 meteorological satellite, a laser with a central wavelength of 777. 4 nm and a continuous output power of 1. 5 W is designed based on a two-stage master oscillation power amplifier structure (MOPA) and a periodically polarized lithium niobate crystal doped with magnesium oxide (MgO: PPLN) to double the frequency. Using 940 nm off-peak pumping technology to suppress the amplified spontaneous emission (ASE) and stimulated Brillouin scattering (SBS) in the optical amplifier, we obtain a single-frequency narrow linewidth laser with an output power of 15 W, a signal-tonoise ratio of 59. 6 dB, a linewidth of 323. 4 kHz, and a relative intensity noise of -145 dBc/ Hz. The optical-optical conversion efficiency of the amplifier is up to 37. 2%. Based on the theoretical analysis of the doubling efficiency, temperature-tuned bandwidth, and acceptable wavelength bandwidth of the MgO: PPLN crystal used, 777. 4 nm continuous light with a power of 1. 5 W is obtained using a single-pass doubling method.
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YAN Qing, SUN Libo, YAO Hongquan. 1554.8 nm frequency doubler based on MgO: PPLN crystal[J]. Laser Journal, 2024, 45(1): 33
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Received: Sep. 8, 2023
Accepted: --
Published Online: Aug. 6, 2024
The Author Email: Libo SUN (sunlibo@seu.edu.cn)