13.5 mJ polarized 2.09 μm fiber-bulk holmium laser and its application to a mid-infrared ZnGeP2 optical parametric oscillator

Encai Ji; Mingming Nie; Qiang Liu

doi:10.3788/COL201715.091402

Journals >Chinese Optics Letters >Volume 15 >Issue 9 >Page 091402 > Article

Chinese Optics Letters
Vol. 15, Issue 9, 091402 (2017)

13.5 mJ polarized 2.09 μm fiber-bulk holmium laser and its application to a mid-infrared

{ZnGeP}_{2}

optical parametric oscillator

Encai Ji, Mingming Nie, and Qiang Liu^*

Author Affiliations

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

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DOI: 10.3788/COL201715.091402 Cite this Article Set citation alerts

Encai Ji, Mingming Nie, Qiang Liu. 13.5 mJ polarized 2.09 μm fiber-bulk holmium laser and its application to a mid-infrared

{ZnGeP}_{2}

optical parametric oscillator[J]. Chinese Optics Letters, 2017, 15(9): 091402 Copy Citation Text

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Layout of the TDFL-pumped Ho:YAG oscillator and amplifier system. (DM1, HT at 0.79 μm and HR at 1.91 μm; DM2, HT at 1.91 μm and HR at 2.09 μm; DM3, HT at p-polarized 2.09 μm and HR at 1.91 μm.)

Fig. 1. Layout of the TDFL-pumped Ho:YAG oscillator and amplifier system. (

{DM}_{1}

, HT at 0.79 μm and HR at 1.91 μm;

{DM}_{2}

, HT at 1.91 μm and HR at 2.09 μm;

{DM}_{3}

, HT at

p

-polarized 2.09 μm and HR at 1.91 μm.)

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(Color online) Typical output spectra of TDFL1. (a) The pump current was set at 1.40, 1.60, and 1.90 A, respectively; (b) the pump current was set at 1.45, 1.65, and 1.98 A, respectively.

Fig. 2. (Color online) Typical output spectra of

{TDFL}_{1}

. (a) The pump current was set at 1.40, 1.60, and 1.90 A, respectively; (b) the pump current was set at 1.45, 1.65, and 1.98 A, respectively.

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Fig. 3. (Color online) CW output characteristics of polarized the Ho:YAG oscillator. (a) The pump absorption efficiency of the Ho:YAG crystal, the CW output power, and the transmittance of

{DM}_{3}

; (b) the beam quality measurement and spectrum of the output laser.

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Fig. 4. (Color online) Pulsed output characteristics of the polarized Ho:YAG oscillator. (a) Pulse energy and pulse duration versus PRF with pump power of 51.6 W; (b) the pulse profiles at eight different PRFs.

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Fig. 5. (Color online) Output characteristics of the polarized Ho:YAG amplifier. (a) Amplified output CW power versus pump power from

{TDFL}_{2}

; (b) amplifier pulse energy and pulse duration versus PRF with

{TDFL}_{1}

power of 51.6 W and

{TDFL}_{2}

power of 37 W.

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Fig. 6. Layout of the TDFL-pumped Ho:YAG oscillator and amplifier system. (

{DM}_{4}

T \approx 90 %

at 3–5 μm and HR at

p

-polarized 2.09 μm).

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Fig. 7. (Color online) (a) Comparison of typical pump pulse profile and parametric pulse profile; (b) the beam quality measurement of parametric light.

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Fig. 8. (Color online) (a) Total parametric output average power versus incident pump average power at a PRF of 3 kHz; (b) the beam quality measurements at three typical parametric pulse energies.

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