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Lin XJ, Feng QC, Zhu Y, Ji SH, Xiao B et al. Diode-pumped wavelength-switchable visible Pr3+:YLF laser and vortex laser around 670 nm. Opto-Electron Adv 4, 210006 (2021). doi: 10.29026/oea.2021.210006
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Original Article Open Access
Diode-pumped wavelength-switchable visible Pr3+:YLF laser and vortex laser around 670 nm
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Abstract
Here we developed a novel wavelength-switchable visible continuous-wave (CW) Pr3+:YLF laser around 670 nm. In single-wavelength laser operations, the maximum output powers of 2.60 W, 1.26 W, and 0.21 W, the maximum slope efficiencies of 34.7%, 27.3%, and 12.3% were achieved with good beam qualities (M2 < 1.6) at 670.4 nm, 674.2 nm, and 678.9 nm, respectively. Record-high output power (2.6 W) and record-high slope efficiency (34.7%) were achieved for the Pr3+:YLF laser operation at 670.4 nm. This is also the first demonstration of longer-wavelength peaks beyond 670 nm in the 3P1→3F3 transition of Pr3+:YLF. In multi-wavelength laser operations, the dual-wavelength lasings, including 670.1/674.8 nm, 670.1/679.1 nm, and 675.0/679.4 nm, were obtained by fine adjustment of one/two etalons within the cavity. Furthermore, the triple-wavelength lasings, e.g. 672.2/674.2/678.6 nm and 670.4/674.8/679.4 nm, were successfully demonstrated. Moreover, both the first-order vortex lasers (LG0+1 and LG0-1 modes) at 670.4 nm were obtained by off-axis pumping.-
Keywords:
- high-power laser /
- visible laser /
- switchable laser /
- deep-red laser
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References
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Lin XJ, Feng QC, Zhu Y, Ji SH, Xiao B et al. Diode-pumped wavelength-switchable visible Pr3+:YLF laser and vortex laser around 670 nm. Opto-Electron Adv 4, 210006 (2021). doi: 10.29026/oea.2021.210006
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Figure 1.
Schematic of the diode-pumped wavelength-switchable CW visible Pr3+: YLF laser around 670 nm
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Figure 2.
Experimental results of single-wavelength lasers around 670 nm. (a) Output powers and slope efficiencies with respect to absorbed pump powers. (b) Laser output spectra at 670.4 nm, 674.2 nm, and 678.9 nm, respectively. (c) Measured corresponding M2 factors of 670.4 nm, 674.2 nm, and 678.9 nm, respectively. (d) Power stabilities of lasers at 670.4 nm, 674.2 nm, and 678.9 nm
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Figure 3.
Emission cross sections of Pr3+:YLF crystal around 670 nm under room temperature.
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Figure 4.
Simulation results of the input-output power characteristics at 670 nm. BR is the waist beam radius of the laser; SE is the slope efficiency. 0.103 mm is the smallest beam radius which can be obtained by the cavity parameters.
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Figure 5.
(a) Output characteristics of dual-wavelength lasers around 670 nm, i.e., 670.1/674.8, 670.1/679.1, 675.0/679.4 nm, respectively. (b) Laser output spectra of dual-wavelength lasers measured at the maximum output powers of 2.52, 1.80, and 0.36 W, respectively. (c) Laser output spectra of triple-wavelength lasers measured at the output powers of 1.78 and 0.84 W, respectively. (d) Power stabilities of the dual-wavelength lasers. (e) Power stabilities of the triple-wavelength lasers.
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Figure 6.
(a) Output performance of the visible vortex laser at 670.4 nm (
${{\text{LG}}_{0}^{+1}}$ ${{\text{LG}}_{0}^{-1}}$
