High-power, high-energy Ho:YAG oscillator pumped by a Tm-doped fiber laser

Encai Ji; Qiang Liu; Zhenyue Hu; Ping Yan; Mali Gong

doi:10.3788/COL201513.121402

Journals >Chinese Optics Letters >Volume 13 >Issue 12 >Page 121402 > Article

Chinese Optics Letters
Vol. 13, Issue 12, 121402 (2015)

High-power, high-energy Ho:YAG oscillator pumped by a Tm-doped fiber laser

Encai Ji, Qiang Liu^*, Zhenyue Hu, Ping Yan, and Mali Gong

Author Affiliations

Department of Precision Instrument, State Key Laboratory of Precision Measurement Technology and Instruments, Center for Photonics and Electronics, Tsinghua University, Beijing 100084, China

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DOI: 10.3788/COL201513.121402 Cite this Article Set citation alerts

Encai Ji, Qiang Liu, Zhenyue Hu, Ping Yan, Mali Gong. High-power, high-energy Ho:YAG oscillator pumped by a Tm-doped fiber laser[J]. Chinese Optics Letters, 2015, 13(12): 121402 Copy Citation Text

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Abstract

A high-power, high-energy Ho:YAG oscillator resonantly pumped by a Tm-doped fiber laser is presented. A maximum continuous output power of 38 W with a slope efficiency of 51.9% is achieved at the wavelength of 2.09 μm, and

M^{2} \approx 1.48

. In the

Q

-switching regime, the maximum pulse energy of 12.8 mJ, corresponding to a 514.5 kW peak power, is obtained at the pulse repetition frequency of 1 kHz. Furthermore, the thermal lens effect of the system is studied theoretically, and the radius of the transverse electromagnetic (

{TEM}_{00}

) mode of the laser crystal under different pump powers is given.

\frac{\partial^{2} T (r, z)}{\partial r^{2}} + \frac{1}{r} \frac{\partial T (r, z)}{\partial r} = - \frac{Q (r, z)}{K_{c}},

(1)

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Q (r, z) = \frac{2 α P_{in} η_{h}}{π ω_{p}^{2} (z)} \exp (- \frac{2 r^{2}}{ω_{p}^{2} (z)} - α z) .

(2)

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{\begin{cases} Δ T (r, z) = T (r, z) - T (r_{0}, z) = \frac{α P_{in} η_{h} \exp (- α z)}{2 π K_{c}} \\ \times [1 - \frac{r^{2}}{ω_{p}^{2} (z)} + \ln (\frac{r_{0}^{2}}{ω_{p}^{2} (z)}) + \ln (\frac{r_{0}^{2}}{r^{2}})] \\ ω_{p} (z) = ω_{p 0} \sqrt{1 + \frac{λ_{p} | z - z_{0} |}{π n ω_{p 0}^{2}}} \end{cases},

(3)

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OPD (r) = 2 [\frac{d n}{d T} + (n - 1) (1 + ν) α_{T}] \times \int_{0}^{L} Δ T (r, z) d z,

(4)

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OPD (r) = {OPD}_{0} - \frac{r^{2}}{f_{th}},

(5)

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Encai Ji, Qiang Liu, Zhenyue Hu, Ping Yan, Mali Gong. High-power, high-energy Ho:YAG oscillator pumped by a Tm-doped fiber laser[J]. Chinese Optics Letters, 2015, 13(12): 121402

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