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[Editor's Pick] Current Optics and Photonics Vol. 9 no. 3 (2025 Jun)_2nd

사무국 hit 114 date 2025-06-25

10 W 15 ns 300 kHz Red-emission of 650 nm Based on Third-harmonic Generation

from Thulium-doped Fiber Laser at 1950 nm

Jinju Kim*, Yong-Ho Cha, Woo-Sang Yu, and Kwang-Hoon Ko

 

Current Optics and Photonics  Vol. 9 No. 3 (2025 June), pp. 202-208
DOI: https://doi.org/10.3807/COPP.2025.9.3.202 

 

Transverse cross section of the proposed photonic crystal fiber (PCF) design, and the extended view of the slotted porous core.

 
Fig. 1  The experimental setup of the 650 nm red laser system includes the following components: Laser diode (LD), isolator (ISO), bandpass filter (BPF), fiber amplifier (FA), electro-optic modulator (EOM), acousto-optic modulator (AOM), circulator, secondharmonic generator (SHG), and third-harmonic generator (THG).

 

Keywords: Fiber laser, Frequency tripling, PPLN, Thulium laser
OCIS codes: (140.3280) Laser amplifiers; (140.3460) Lasers; (140.3510) Laser, fiber


Abstract
A 10 W, 15 ns, 300 kHz pulsed laser emitting at 650 nm was developed through second- and thirdharmonic generation based on a 20 W pulsed thulium-doped all-fiber laser operating at 1950 nm. The 1950 nm all-fiber laser, which was constructed using a master oscillator power amplifier configuration, comprised one continuous-wave amplifier, two pulsed pre-amplifiers, and a final main amplifier. The amplified output power at the fundamental wavelength was 20 W and it was frequency-tripled to 650 nm using two MgO-doped periodically poled lithium niobate crystals. The maximum emission power achieved at 650 nm was 10 W and the conversion efficiency from 1950 nm to 650 nm was around 50%. To the best of our knowledge, this represents the first development of a nanosecond-pulsed 650 nm emitting source that attains an output power of 10 W through the frequency-tripling of a thulium-doped fiber laser.

 

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