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Huang H Z, Li J H, Deng J, Ge Y, Liu H G et al. Passively Q-switched Tm/Ho composite laser. Opto-Electron Adv 3, 190031 (2020). doi: 10.29026/oea.2020.190031
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Abstract
We explored Q-switching mechanism for the newly proposed Tm/Ho composite laser via developing a hybrid resonator for separating the intra-cavity Tm laser modulated by the saturable absorber (SA). With a Cr:ZnSe SA, successful passively Q-switching process with the maximum average output power of 474 mW and the shortest pulse width of 145 ns were obtained at the pulse repetition frequency of 7.14 kHz, where dual wavelength oscillation in both 2090 nm and 2097 nm was observed. This work provides an effective way for a direct laser diode (LD) pumped Q-switched Ho laser, which is compact and accessible. Furthermore, the current SA could be replaced by the 2D materials with broadband saturable absorption such as topological insulators or transition-metal dichalcogenides for seeking novel PQS lasers.-
Keywords:
- Ho laser /
- Tm laser /
- Tm/Ho composite /
- passively Q-switched /
- Cr:ZnSe
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References
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Huang H Z, Li J H, Deng J, Ge Y, Liu H G et al. Passively Q-switched Tm/Ho composite laser. Opto-Electron Adv 3, 190031 (2020). doi: 10.29026/oea.2020.190031
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Figure 1.
Layout of the PQS Tm/Ho composite laser.
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Figure 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.
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Figure 3.
Emission cross section of the Tm-doped and Ho-doped regions and transmittance of the Cr:ZnSe SA.
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Figure 4.
Comparison in pulse trains from the hybrid cavity before (a) and after (b) using the Cr2+:ZnSe.
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Figure 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).
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Figure 6.
Wavelength properties of the Tm/Ho composite laser:
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Figure 7.
Evolutions in the pule repetition frequency and pulse width with the absorbed LD power.
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Figure 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.
