Yongguang Zhao, Li Wang, Weidong Chen, Jianlei Wang, Qingsong Song, Xiaodong Xu, Ying Liu, Deyuan Shen, Jun Xu, Xavier Mateos, Pavel Loiko, Zhengping Wang, Xinguang Xu, Uwe Griebner, Valentin Petrov, "35 W continuous-wave Ho:YAG single-crystal fiber laser," High Power Laser Sci. Eng. 8, 02000e25 (2020)
- High Power Laser Science and Engineering
- Vol. 8, Issue 2, 02000e25 (2020)
Fig. 1. (a) Photograph of the end facet of the Ho:YAG SCF. (b) Schematic of the Ho:YAG SCF laser: L1–L3, lenses with 
, 100 and 150 mm, respectively; M1, M2, bending mirrors; M3, dichroic mirror; PM, pump mirror; OC, output coupler.
, 100 and 150 mm, respectively; M1, M2, bending mirrors; M3, dichroic mirror; PM, pump mirror; OC, output coupler. ![(a) Laser performance of the Ho:YAG SCF laser with different OCs and (b) the corresponding optical spectra. The gray curves are the calculated gain spectra of Ho:YAG[17] with different population inversion parameters .](/richHtml/hpl/2020/8/2/02000e25/img_2.png)
Fig. 2. (a) Laser performance of the Ho:YAG SCF laser with different OCs and (b) the corresponding optical spectra. The gray curves are the calculated gain spectra of Ho:YAG[17] with different population inversion parameters 
.
. 
Fig. 3. Caird plot for the high-power Ho:YAG SCF laser: inverse slope efficiency with respect to the inverse output-coupling loss, i.e., 
.
. Fig. 4. Beam intensity profiles recorded at different output powers with 
; 
is the calculated beam ellipticity from each image.
; is the calculated beam ellipticity from each image. Fig. 5. (a) The measured 
-factor of the Ho:YAG SCF laser (
) at different absorbed pump powers and (b) a typical 
measurement at 7 W output laser power.
-factor of the Ho:YAG SCF laser () at different absorbed pump powers and (b) a typical measurement at 7 W output laser power. 
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