Kale Beckwitt
Cornell University
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Publication
Featured researches published by Kale Beckwitt.
Physical Review Letters | 2003
Peer Fischer; A.D. Buckingham; Kale Beckwitt; Diederik S. Wiersma; Frank W. Wise
We report the observation of sum-frequency signals that depend linearly on an applied electrostatic field and that change sign with the handedness of an optically active solute. This recently predicted chiral electro-optic effect exists in the electric-dipole approximation. The static electric field gives rise to an electric-field-induced sum-frequency signal (an achiral third-order process) that interferes with the chirality-specific sum-frequency at second order. The cross-terms linear in the electrostatic field constitute the effect and may be used to determine the absolute sign of second- and third-order nonlinear-optical susceptibilities in isotropic media.
Chemical Physics Letters | 2002
Peer Fischer; Kale Beckwitt; Frank W. Wise; A.C. Albrecht
Sum-frequency generation in isotropic media is in the electric-dipole approximation the only symmetry allowed for chiral systems. We demonstrate that the sum-frequency intensity from an optically active liquid depends quadratically on the difference in concentration of the two enantiomers. The dominant contribution to the signal is found to be due to the chirality specific electric-dipolar three-wave mixing nonlinearity. Selecting the polarization of all fields allows the chiral electric-dipolar contributions to the bulk sum-frequency signal to be discerned from any achiral magnetic-dipolar and electric-quadrupolar contributions.
Optics Letters | 2001
Kale Beckwitt; Frank W. Wise; Liejia Qian; Larry A. Walker; Edesly Canto-Said
We demonstrate theoretically and experimentally compensation for positive Kerr phase shifts with negative phases generated by cascade quadratic processes. Experiments show correction of small-scale self-focusing and whole-beam self-focusing in the spatial domain and self-phase modulation in the temporal domain.
Physical Review E | 2004
Yi-Fan Chen; Kale Beckwitt; Frank W. Wise; Boris A. Malomed
Criteria for experimental observation of multidimensional optical solitons in media with saturable refractive nonlinearities are developed. The criteria are applied to actual material parameters (characterizing the cubic self-focusing and quintic self-defocusing nonlinearities, two-photon loss, and optical-damage threshold) for various glasses. This way, we identify operation windows for soliton formation in these glasses. It is found that two-photon absorption sets stringent limits on the windows. We conclude that, while a well-defined window of parameters exists for two-dimensional solitons (spatial or spatiotemporal), for their three-dimensional spatiotemporal counterparts such a window does not exist, due to the nonlinear loss in glasses.
Journal of The Optical Society of America B-optical Physics | 2006
Wenhua Su; Liejia Qian; Hang Luo; Xiquan Fu; Heyuan Zhu; Tao Wang; Kale Beckwitt; Yi-Fan Chen; Frank W. Wise
We show theoretically and experimentally that, in phase-mismatched second-harmonic generation, an effective group-velocity dispersion is induced at the second-harmonic frequency. Experimental results agree quite well with the theoretical predictions. Although large phase mismatch is required to induce appreciable group-velocity dispersion in birefringent nonlinear crystals, similar effects can be observed in quasi-phase-matched structures at much lower phase mismatch. Some implications of the induced dispersion for pulse propagation in quadratic media are discussed.
Journal of the History of Ideas | 1971
Kale Beckwitt; Jeffrey Moses; F. Ö. Ilday; Frank W. Wise; John A. Nees; Erik Power; Keung H. Hong; Bixue Hou; Gerard A. Mourou
Theoretically, Raman-like soliton compression of mJ, 30-fs pulses is predicted. Initial experiments demonstrate 2 times compression of 1.3 TW/cm2 pulses under non-optimal conditions. The results agree closely with numerical simulations.
Optics Letters | 2004
Kale Beckwitt; F. Ö. Ilday; Frank W. Wise
The frequency shifts resulting from cascaded processes with strong group-velocity mismatch can be controlled and enhanced with nonlinearity management in quasi-phase matched structures. We demonstrate theoretically tailored, efficient frequency shifting of infrared pulses.
Optics Letters | 2000
Xianghong Liu; F. Ö. Ilday; Kale Beckwitt; Frank W. Wise
We experimentally demonstrate that one can exploit nonlinear phase shifts produced in type I phase-mismatched second-harmonic generation to produce intensity-dependent polarization evolution with 100-fs pulses. An amplitude modulator based on nonlinear polarization rotation provides passive amplitude-modulation depth of up to ~50%. Applications of the amplitude and phase modulations to mode locking of femtosecond bulk and fiber lasers are promising and are discussed.
quantum electronics and laser science conference | 2003
F. Ö. Ilday; Kale Beckwitt; Hyungsik Lim; Frank W. Wise
We theoretically and experimentally demonstrate the controllable frequency shift of femtosecond pulses in quadratic media in the presence of group velocity mismatch. Applications of this new capability to the compensation of Raman scattering and high-energy pulse compression are discussed.
International Conference on Ultrafast Phenomena | 2000
Frank W. Wise; Xianghong Liu; F. Ö. Ilday; Kale Beckwitt; F.W. Wise
We experimentally demonstrate strong amplitude modulation of 100 fs pulses with nonlinear polarization evolution based on type-I second-harmonic generation. Applications of this process to mode-locking of bulk and fiber lasers is promising and will be discussed.