Journal article · Preprint article
Optical Cherenkov radiation by cascaded nonlinear interaction: an efficient source of few-cycle energetic near- to mid-IR pulses
Ultrafast Nonlinear Optics group, Department of Photonics Engineering, Technical University of Denmark1
Department of Photonics Engineering, Technical University of Denmark2
Fiber Sensors & Supercontinuum, Department of Photonics Engineering, Technical University of Denmark3
Massachusetts Institute of Technology4
Cornell University5
When ultrafast noncritical cascaded second-harmonic generation of energetic femtosecond pulses occur in a bulk lithium niobate crystal optical Cherenkov waves are formed in the near- to mid-IR. Numerical simulations show that the few-cycle solitons radiate Cherenkov (dispersive) waves in the λ = 2.2−4.5 μm range when pumping at λ1 = 1.2−1.8 μm.
The exact phase-matching point depends on the soliton wavelength, and we show that a simple longpass filter can separate the Cherenkov waves from the solitons. The Cherenkov waves are born few-cycle with an excellent Gaussian pulse shape, and the conversion efficiency is up to 25%. Thus, optical Cherenkov waves formed with cascaded nonlinearities could become an efficient source of energetic near- to mid-IR few-cycle pulses.
Language: | English |
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Year: | 2011 |
Pages: | 22557-22562 |
ISSN: | 10944087 |
Types: | Journal article and Preprint article |
DOI: | 10.1364/OE.19.022557 |
ORCIDs: | Bache, Morten , Bang, Ole and Zhou, Binbin |