Efficient and high-spatiotemporal-quality terawatt-class mid-infrared optical parametric amplifiers by spatially shaped pumping

Xin Liu; Xin Liu; Jinhui Li; Jinhui Li; Qiwen Zhen; Qiwen Zhen; Keyang Liu; Keyang Liu; Keyang Liu; Yishan Wang; Yishan Wang; Wei Zhao; Wei Zhao; Huabao Cao; Huabao Cao; Yuxi Fu; Yuxi Fu; Yuxi Fu

doi:10.1364/JOSAB.509609

Journal of the Optical Society of America B
Vol. 41,
Issue 2,
pp. 364-372
(2024)
•https://doi.org/10.1364/JOSAB.509609

Efficient and high-spatiotemporal-quality terawatt-class mid-infrared optical parametric amplifiers by spatially shaped pumping

Xin Liu, Jinhui Li, Qiwen Zhen, Keyang Liu, Yishan Wang, Wei Zhao, Huabao Cao, and Yuxi Fu

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Xin Liu, Jinhui Li, Qiwen Zhen, Keyang Liu, Yishan Wang, Wei Zhao, Huabao Cao, and Yuxi Fu, "Efficient and high-spatiotemporal-quality terawatt-class mid-infrared optical parametric amplifiers by spatially shaped pumping," J. Opt. Soc. Am. B 41, 364-372 (2024)

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- Light Sources and Amplifiers
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About this Article
History
- Original Manuscript: October 17, 2023
- Revised Manuscript: December 12, 2023
- Manuscript Accepted: December 13, 2023
- Published: January 9, 2024

Abstract

We propose a method to efficiently generate terawatt (TW)-class mid-infrared (MIR) femtosecond laser pulses with high spatiotemporal quality through optical parametric chirped-pulse amplification (OPCPA). By transforming the pump-beam profile for the OPCPA from Gaussian to flat-top using a designed field mapping optics consisting of two aspherical lenses, we obtain a TW-class femtosecond laser pulse at 2 µm with a conversion efficiency of over 36% according to our simulations. Furthermore, the spatiotemporal coupling effects are greatly suppressed in our method compared to an OPCPA system that is pumped by a widely employed Gaussian profile beam. Our work provides a simple and robust method for developing OPCPA systems with high efficiency and high pulse quality.

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Lens	$1 / c$ (mm)	$k$	$b_{1} ({m m}^{- 1})$	$b_{2} ({m m}^{- 3})$	$b_{3} ({m m}^{- 5})$	$b_{4} ({m m}^{- 7})$
1	−200	0	0	$- 1.508 \times 10^{- 5}$	$4.034 \times 10^{- 8}$	$- 4.722 \times 10^{- 11}$
2	−142.857	10	0	$- 7.618 \times 10^{- 5}$	$1.048 \times 10^{- 6}$	$- 9.536 \times 10^{- 8}$

		Temporal Shape		Spatial Shape	Beam Diameter (mm)
	Crystal Thickness (mm)	Pump	Signal	Pump	Pump	Signal
Case 1	4.5	Gaussian	Gaussian	Gaussian	14	28
Case 2	3.6	Gaussian	Gaussian	12th order super-Gaussian	11	17
Case 3	3.9	Gaussian	Conformal	12th order super-Gaussian	11	17

Lens	$1 / c$ (mm)	$k$	$b_{1} ({m m}^{- 1})$	$b_{2} ({m m}^{- 3})$	$b_{3} ({m m}^{- 5})$	$b_{4} ({m m}^{- 7})$
1	−200	0	0	$- 1.508 \times 10^{- 5}$	$4.034 \times 10^{- 8}$	$- 4.722 \times 10^{- 11}$
2	−142.857	10	0	$- 7.618 \times 10^{- 5}$	$1.048 \times 10^{- 6}$	$- 9.536 \times 10^{- 8}$

		Temporal Shape		Spatial Shape	Beam Diameter (mm)
	Crystal Thickness (mm)	Pump	Signal	Pump	Pump	Signal
Case 1	4.5	Gaussian	Gaussian	Gaussian	14	28
Case 2	3.6	Gaussian	Gaussian	12th order super-Gaussian	11	17
Case 3	3.9	Gaussian	Conformal	12th order super-Gaussian	11	17

Abstract

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Journal of the Optical Society of America B