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Optical Materials Express

Optical Materials Express

  • Editor: David J. Hagan
  • Vol. 3, Iss. 10 — Oct. 1, 2013
  • pp: 1647–1657

Generating mid-IR octave-spanning supercontinua and few-cycle pulses with solitons in phase-mismatched quadratic nonlinear crystals

Morten Bache, Hairun Guo, and Binbin Zhou  »View Author Affiliations


Optical Materials Express, Vol. 3, Issue 10, pp. 1647-1657 (2013)
http://dx.doi.org/10.1364/OME.3.001647


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Abstract

We discuss a novel method for generating octave-spanning supercontinua and few-cycle pulses in the important mid-IR wavelength range. The technique relies on strongly phase-mismatched cascaded second-harmonic generation (SHG) in mid-IR nonlinear frequency conversion crystals. Importantly we here investigate the so-called noncritical SHG case, where no phase matching can be achieved but as a compensation the largest quadratic nonlinearities are exploited. A self-defocusing temporal soliton can be excited if the cascading nonlinearity is larger than the competing material self-focusing nonlinearity, and we define a suitable figure of merit to screen a wide range of mid-IR dielectric and semiconductor materials with large effective second-order nonlinearities deff. The best candidates have simultaneously a large bandgap and a large deff. We show selected realistic numerical examples using one of the promising crystals: in one case soliton pulse compression from 50 fs to 15 fs (1.5 cycles) at 3.0 μm is achieved, and at the same time a 3-cycle dispersive wave at 5.0 μm is formed that can be isolated using a long-pass filter. In another example we show that extremely broadband supercontinua can form spanning the near-IR to the end of the mid-IR (nearly 4 octaves).

© 2013 OSA

OCIS Codes
(190.2620) Nonlinear optics : Harmonic generation and mixing
(190.5530) Nonlinear optics : Pulse propagation and temporal solitons
(320.2250) Ultrafast optics : Femtosecond phenomena
(320.5520) Ultrafast optics : Pulse compression
(320.7110) Ultrafast optics : Ultrafast nonlinear optics

ToC Category:
Nonlinear Optical Materials

History
Original Manuscript: June 17, 2013
Revised Manuscript: August 30, 2013
Manuscript Accepted: August 30, 2013
Published: September 12, 2013

Virtual Issues
Mid-IR Photonic Materials (2013) Optical Materials Express

Citation
Morten Bache, Hairun Guo, and Binbin Zhou, "Generating mid-IR octave-spanning supercontinua and few-cycle pulses with solitons in phase-mismatched quadratic nonlinear crystals," Opt. Mater. Express 3, 1647-1657 (2013)
http://www.opticsinfobase.org/ome/abstract.cfm?URI=ome-3-10-1647


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