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[J]. Chinese Optics Letters, 2024, 22(3): 031404
- Chinese Optics Letters
- Vol. 22, Issue 3, 031404 (2024)
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.
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Table 1. Key Parameters of the Experimental Setup
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Table 2. Primary Performance Metrics of the Laser System
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