• Opto-Electronic Advances
  • Vol. 3, Issue 4, 190031-1 (2020)
Haizhou Huang1, Jinhui Li1, Jing Deng1,2, Yan Ge1..., Huagang Liu3, Jianhong Huang1, Wen Weng1,2 and Wenxiong Lin1,*|Show fewer author(s)
Author Affiliations
  • 1Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
  • 2University of Chinese Academy of Sciences, Beijing 100049, China
  • 3Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, 117576, Singapore
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    DOI: 10.29026/oea.2020.190031 Cite this Article
    Haizhou Huang, Jinhui Li, Jing Deng, Yan Ge, Huagang Liu, Jianhong Huang, Wen Weng, Wenxiong Lin. Passively Q-switched Tm/Ho composite laser[J]. Opto-Electronic Advances, 2020, 3(4): 190031-1 Copy Citation Text show less
    Layout of the PQS Tm/Ho composite laser.
    Fig. 1. Layout of the PQS Tm/Ho composite laser.
    (a, b) Evolutions in cavity mode sizes ωc and ωs with the absorbed LD power Pabs at different M1 curvature radii (R1=75 mm, 100 mm and 200 mm); (c) Evolution in key parameter α with Pabs, where the colorful areas denote corresponding unstable regions (green for R1=75 mm, blue for R1=100 mm), αth is (ni/nth)/(ni/nth-1) in Equation (1). Values of the parameters for the above calculation are summarized in Table 1.
    Fig. 2. (a, b) Evolutions in cavity mode sizes ωc and ωs with the absorbed LD power Pabs at different M1 curvature radii (R1=75 mm, 100 mm and 200 mm); (c) Evolution in key parameter α with Pabs, where the colorful areas denote corresponding unstable regions (green for R1=75 mm, blue for R1=100 mm), αth is (ni/nth)/(ni/nth-1) in Equation (1). Values of the parameters for the above calculation are summarized in Table 1.
    Emission cross section of the Tm-doped and Ho-doped regions and transmittance of the Cr:ZnSe SA.
    Fig. 3. Emission cross section of the Tm-doped and Ho-doped regions and transmittance of the Cr:ZnSe SA.
    Comparison in pulse trains from the hybrid cavity before (a) and after (b) using the Cr2+:ZnSe.
    Fig. 4. Comparison in pulse trains from the hybrid cavity before (a) and after (b) using the Cr2+:ZnSe.
    (a) Average output powers of the free-running Ho laser and PQS Ho laser versus absorbed pump power. (b) Beam profile of the PQS composite Ho laser at the maximum output power of 474 mW (Inset: 3D beam profile at the beam waist).
    Fig. 5. (a) Average output powers of the free-running Ho laser and PQS Ho laser versus absorbed pump power. (b) Beam profile of the PQS composite Ho laser at the maximum output power of 474 mW (Inset: 3D beam profile at the beam waist).
    Wavelength properties of the Tm/Ho composite laser:(a) at the maximum free-running (CW) laser power; (b) at the threshold PQS laser power of 20 mW; (c) at the maximum PQS laser power; (d) the measured peak wavelengths at different average output power.
    Fig. 6. Wavelength properties of the Tm/Ho composite laser: (a) at the maximum free-running (CW) laser power; (b) at the threshold PQS laser power of 20 mW; (c) at the maximum PQS laser power; (d) the measured peak wavelengths at different average output power.
    Evolutions in the pule repetition frequency and pulse width with the absorbed LD power.
    Fig. 7. Evolutions in the pule repetition frequency and pulse width with the absorbed LD power.
    (a) Typical pules train with PRF of 7.14 kHz at the maximum PQS output power. (b) Detail view of the shortest pulse with a width of 145 ns at the maximum output power.
    Fig. 8. (a) Typical pules train with PRF of 7.14 kHz at the maximum PQS output power. (b) Detail view of the shortest pulse with a width of 145 ns at the maximum output power.
    ParameterValue
    σgs1.3×10-19 cm2, Ref.29
    σ1.4×10-20 cm2
    σes0.9×10-19 cm2, Ref.29
    C8.2893 mm/W, Ref.25
    T092%
    λ2122 nm
    L0.03
    ωp213 μm
    TOC10%
    R2Infinity
    R175 mm, 100 mm, 200 mm
    l18 mm
    l238 mm
    n1.82
    Table 1. Values of the parameters in Equations (1)–(5).
    Haizhou Huang, Jinhui Li, Jing Deng, Yan Ge, Huagang Liu, Jianhong Huang, Wen Weng, Wenxiong Lin. Passively Q-switched Tm/Ho composite laser[J]. Opto-Electronic Advances, 2020, 3(4): 190031-1
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