期刊
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
卷 38, 期 8, 页码 2252-2260出版社
OPTICAL SOC AMER
DOI: 10.1364/JOSAB.427086
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资金
- National Science Foundation [1708743]
- Air Force Office of Scientific Research [FA9550-16-1-0016, FA9550-16-1-0164, FA9550-201-0259]
- Defense Advanced Research Projects Agency SCOUT program
- National Institute of Standards and Technology NIST on a Chip
- U.S. Department of Education GAANN program
- Division Of Chemistry
- Direct For Mathematical & Physical Scien [1708743] Funding Source: National Science Foundation
Efficient, phase-coherent harmonic generation up to the ninth order has been observed in chirped periodically poled lithium niobate waveguides. The conversion efficiency from mid-infrared to ultraviolet-visible is as high as 10%, with an overall conversion of 23% of the fundamental to all harmonics. By comparing theory with experiment, a dimensionless parameter governing cascaded HHG physics has been identified.
High-harmonic generation (HHG) provides short-wavelength light that is useful for precision spectroscopy and probing ultrafast dynamics. We report efficient, phase-coherent harmonic generation up to the ninth order (333 nm) in chirped periodically poled lithium niobate waveguides driven by phase-stable <= 12 nJ, 100 fs pulses at 3 mu m with 100 MHz repetition rate. A mid-infrared to ultraviolet-visible conversion efficiency as high as 10% is observed, among an overall 23% conversion of the fundamental to all harmonics. We verify the coherence of the harmonic frequency combs despite the complex highly nonlinear process. Accommodating the extreme spectral bandwidth, numerical simulations based on a single broadband envelope equation with only quadratic nonlinearity give estimates for the conversion efficiency within approximately 1 order of magnitude over a wide range of experimental parameters. From this comparison between theory and experiment, we identify a dimensionless parameter capturing the competition between three-wave mixing and group-velocity walk-off of the harmonics that governs the cascaded HHG physics. We also gain insights into spectral optimization via tuning the wave-guide poling profile and pump pulse parameters. These results can inform cascaded HHG in a range of different platforms. (C) 2021 Optical Society of America
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