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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- Opto-Electronic Advances
- Vol. 3, Issue 4, 190031-1 (2020)

Fig. 1. Layout of the PQS Tm/Ho composite laser.

Fig. 2. (a , b ) Evolutions in cavity mode sizes ω c and ω s with the absorbed LD power P abs at different M1 curvature radii (R 1=75 mm, 100 mm and 200 mm); (c ) Evolution in key parameter α with P abs, where the colorful areas denote corresponding unstable regions (green for R 1=75 mm, blue for R 1=100 mm), α th is (ni /n th)/(ni /n th-1) in Equation (1). Values of the parameters for the above calculation are summarized in Table 1 .

Fig. 3. Emission cross section of the Tm-doped and Ho-doped regions and transmittance of the Cr:ZnSe SA.

Fig. 4. Comparison in pulse trains from the hybrid cavity before (a) and after (b) using the Cr2+:ZnSe.

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).

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.

Fig. 7. Evolutions in the pule repetition frequency and pulse width with the absorbed LD 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.
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Table 1. Values of the parameters in Equations (1)–(5).

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