Chinese Optics Letters, Volume. 22, Issue 3, 031404(2024)
Stable ultraviolet ultrafast laser based on all-polarization-maintaining fiber femtosecond laser
Figures & Tables(9)
Fig. 1. Sketch of the all-PM fiber ultrafast laser system. SM-LD, single-mode laser diode; WDM, wavelength division multiplexer; YDF, Yb-doped fiber; OC, optical coupler; PS, phase shifter; CFBG, chirped fiber Bragg grating; ISO, isolator; MM-LD, multimode laser diode.
Fig. 2. Schematic diagram of UV pulse generation. M, mirror; HWP, half-wave plate; PBS, polarization beam splitter; BB, beam barrier; DM, dichroic mirror; BPF, bandpass filter.
Fig. 3. Performance of the figure-9 mode-locked fiber laser. (a) Optical spectrum; (b) oscilloscopic trace; (c) RF spectrum; (d) PN and RIN.
Fig. 4. Performance of the 1.0-µm high-power all-PM Yb-doped ultrafast fiber laser. (a) Optical spectrum measured at 1% port of OC; (b) output power of the main amplifier varying against launched pump power; (c) M2 measurement of the amplified laser beam; (d) power stability at 6.9 W in 1-h test.
Fig. 5. Autocorrelation trace of the 1.0-µm pulse after the compressor.
Fig. 6. Performance of the SHG. (a) Output power of the second-harmonic component and corresponding efficiency with varying input powers; (b) optical spectrum; (c) power stability of SHG within 1 h.
Fig. 7. Performance of the SFG. (a) Variation of the SFG power and efficiency with the input power of fundamental light; (b) optical spectrum; (c) power stability of SFG within 1 h.
Table 1. Key Parameters of the Experimental Setup
View tableView in ArticleTable 1. Key Parameters of the Experimental Setup
Part Parameter Value Seed CFBG’s second-order dispersion 0.25 ps/nm CFBG’s reflectivity 25% Cavity length 6.5 m Gain fiber length 50 cm Stretcher Fiber length 500 m Preamplifier Gain fiber length 1 m Main amplifier Gain fiber length 3.5 m Compressor Grating’s group density 1600 lines/mm Grating’s maximum diffraction angle 58° ± 1° Grating’s maximum diffraction efficiency ≥94% SHG Lens’s focal length 50 mm BIBO’s length 1.3 mm BIBO θ 168.5° BIBO φ 90° SFG Lens’s focal length 100 mm BIBO’s length 5.1 mm BIBO θ 142° BIBO φ 90°
Table 2. Primary Performance Metrics of the Laser System
View tableView in ArticleTable 2. Primary Performance Metrics of the Laser System
Process Parameter Value Fundamental source Output average power 6 W 3-dB spectral width 17.5 nm Center wavelength 1060 nm Repetition rate 28.9 MHz Pulse duration 244 × 1.54 fs RMSE 0.3% SHG Output average power 2.28 W Maximum efficiency 38% Center wavelength 530 nm RMSE 0.35% THG Output average power 596 mW Maximum efficiency 11% Center wavelength 352 nm RMSE 0.54%
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Hao Tian, Zhe Zhu, Wei Lin, Zihao Li, Junpeng Wen, Hao Xiu, Yiheng Fan, Chiyi Wei, Xiaoming Wei, Zhongmin Yang, "Stable ultraviolet ultrafast laser based on all-polarization-maintaining fiber femtosecond laser," Chin. Opt. Lett. 22, 031404 (2024)
Paper Information
Category: Lasers, Optical Amplifiers, and Laser Optics
Received: Aug. 6, 2023
Accepted: Nov. 29, 2023
Posted: Dec. 4, 2023
Published Online: Mar. 25, 2024
The Author Email: Xiaoming Wei (xmwei@scut.edu.cn), Zhongmin Yang (yangzm@scut.edu.cn)
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