Chinese Journal of Lasers, Volume. 48, Issue 4, 0401009(2021)
Research Progress and Prospect of Fiber Gas Laser Sources (II): Based on Population Inversion
Figures & Tables(17)
![Comparison of laser wavebands generated by typical fiber gas laser and fiber laser[1]](/Images/icon/loading.gif){kind=icon}
Fig. 1. Comparison of laser wavebands generated by typical fiber gas laser and fiber laser[1]
Fig. 2. Diagrams of energy level transition. (a) Diagram of energy level transition of C2H2 molecules pumped with P branch absorption lines; (b) diagram of energy level transition of CO2 molecules pumped with R branch absorption lines
Fig. 4. 3 μm laser generation from acetylene-filled Kagome HCF pumped by OPO[2]. (a) Experimental setup; (b) output 3 μm laser spectrum
Fig. 5. Single-pass configuration experiment using acetylene-filled anti-resonant HCF pumped by tunable diode laser [4]. (a) Diagram of experimental setup; (b) laser pulse energy varying with absorbed pump pulse energy at different pressure
Fig. 6. Ring-cavity configuration experiment using acetylene-filled anti-resonant HCF pumped by diode laser[6].(a) Diagram of experimental setup; (b) output spectra for different pump wavelengths
Fig. 7. Single-pass configuration experiment of fiber acetylene gas CW laser output[7]. (a) Diagram of experimental setup; (b) output laser power as a function of absorbed pump power at different pressure
Fig. 8. Experiment for measuring output beam quality of fiber acetylene gas laser[8]. (a) Experimental setup; (b) M2 value corresponding to different output pulse energy
Fig. 9. Experiment of OPO pumping CO2-filled silver plating capillary[1]. (a) Diagram of experimental setup; (b) output spectrum and energy level transition principle
Fig. 10. Experimental setup and results of CO2 laser based on anti-resonant HCFs[13]. (a) Diagram of experimental setup; (b) schematic diagram of energy level transition; (c) output spectrum; (d) output power at 4 μm varying with absorbed pump power
Fig. 11. Experiment of thulium-doped fiber amplifier pumping HBr-filled anti-resonant HCF[14]. (a) Diagram of experimental setup; (b) output spectrum and energy level transition principle
Fig. 12. Experimental setup and output spectrum of CW light pumped I2 vapor fiber gas laser[5]. (a) Experimental setup;(b) output laser spectrum
Fig. 13. Experiments of 3 μm laser radiation from electrically excited He-Xe gas based on anti-resonant HCF[41]. (a) Diagram of experimental setup and output signals for different fiber lengths; (b) output laser spectrum
Fig. 15. Coupling efficiency of tapered fiber and anti-resonant HCF varying with waist diameter[48]. (a) Coupling efficiency of tapered fiber HI-1060 and ice-cream anti-resonant HCF at 1064 nm varying with waist diameter. Inset is output near field from HCF; (b) coupling efficiency of tapered SMF-28 and node-less anti-resonant HCF at 1568 nm varying with waist diameter
Table 1. Common gas media and related parameters in mid-infrared fiber gas laser
View tableTable 1. Common gas media and related parameters in mid-infrared fiber gas laser
Gas gain medium Pumping band Lasing band λ /μm Vibrational state transition Spectral line intensity / (cm·molecule-1) λ /μm Vibrational state transition Spectral line intensity / (cm·molecule-1) C2H2 1.51--1.55 v0→v1+v3 1.34×10-20 3.09--3.21 v1+v3→v1 - CO 1.56--1.65 v=0→v=3 2.17×10-23 2.32--2.51 v=3→v=1 3.17×10-25 CO 2.29--2.52 v=0→v=2 3.47×10-21 4.43--5.26 v=2→v=1 2.70×10-23 CO2 1.99--2.06 v0→2v1+v3 1.32×10-21 4.25--4.53 2v1+v3→2v1 7.55×10-24 N2O 1.98--2.02 v0→3v1+2v2 5.00×10-23 2.65--2.71 3v1+2v2→v1 5.97×10-24 HI 1.53--1.95 v=0→v=3 3.22×10-22 4.45--7.49 v=3→v=2 5.00×10-30 HBr 1.94--2.72 v=0→v=2 8.30×10-22 3.69--6.59 v=2→v=1 5.63×10-25
Table 2. Research progress of fiber gas lasers based on population inversion
View tableTable 2. Research progress of fiber gas lasers based on population inversion
Pump source Pump wavelength /nm Gas gain medium Laser wavelength /μm Maximum laser energy or power Efficiency /% Ref. No. OPO 1521 C2H2 3.12, 3.16 6 nJ 1 [2] OPA 1532.8 C2H2 3.11, 3.17 550 nJ 20 [3] OPA 1541.3 HCN 3.09, 3.15 56 nJ 0.02 [3] OPO 2002.5 CO2 4.30, 4.37 100 μJ 20 [3] OPO 1521 C2H2 3.12, 3.16 600 nJ 27 [1] Diode laser 1530 C2H2 3.12, 3.16 0.8 μJ 30 [4] Nd∶Vanadate 532 I2 1.31, 1.33 8 mW 4 [5] Diode laser 1530 C2H2 3.08--3.18 2.5 mW 6.7 [6] Diode laser 1530 C2H2 3.12, 3.16 1.12 W 33.2 [7] OPA 1530 C2H2 3.11, 3.17 1.41 μJ 20 [8] Diode laser 1530--1535 C2H2 3.09--3.21 0.6 μJ 0.77 W (CW) 16 13 [10] TDFA 2000.6 CO2 4.30, 4.39 80 mW 19.3 [13] OPO 1517 N2O 4.59, 4.66 150 nJ 9 [12] Electrodes He∶Xe (5∶1) 3.11, 3.37, 3.51 [41]
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Zefeng Wang, Zhiyue Zhou, Yulong Cui, Wei Huang, Zhixian Li, Hao Li. Research Progress and Prospect of Fiber Gas Laser Sources (II): Based on Population Inversion[J]. Chinese Journal of Lasers, 2021, 48(4): 0401009
Paper Information
Special Issue: SPECIAL ISSUE FOR "NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY"
Received: Nov. 16, 2020
Accepted: Dec. 21, 2020
Published Online: Feb. 4, 2021
The Author Email: Zefeng Wang (zefengwang_nudt@163.com)
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