Ultrashort-pulse second-harmonic generation with longitudinally nonuniform quasi-phase-matching gratings: pulse compression and shaping

Imeshev, G.; Arbore, M. A.; Fejer, M. M.; Galvanauskas, Almantas; Fermann, M. E.; Harter, D.

doi:10.1364/josab.17.000304

Cited by 174 publications

(125 citation statements)

References 31 publications

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“…One of the most established and successful ones is the use of aperiodically poled material (QPM engineering), which effectively broadens the spectral filter. 18 Another alternative approach is the critical phase matching scheme involving spatial walk-off with pulse-front tilt.…”

Section: Discussionmentioning

confidence: 99%

Theoretical and numerical investigations of parametric transfer via difference-frequency generation for indirect mid-infrared pulse shaping

et al. 2007

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We theoretically and numerically investigate indirect mid-infrared pulse shaping via parametric transfer, specifically difference-frequency generation. We define a quantitative measure for the fidelity of parametric transfer, and investigate the effect of material dispersion and process nonlinearity on the parametric transfer. We show that a good fidelity transfer of a broadbandwidth pulse can be efficiently achieved with a reasonable wavelength tunability, by careful design of the experimental configuration.

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Section: Discussionmentioning

confidence: 99%

Theoretical and numerical investigations of parametric transfer via difference-frequency generation for indirect mid-infrared pulse shaping

et al. 2007

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“…The broad bandwidth response is in particular importance for frequency conversion of ultrashort pulses. Chirped QPM gratings have been utilized to manipulate short pulses both in second harmonic generation (SHG) [9,10,11], difference frequency generation (DFG) [12], and in parametric amplification [10,13]. Recent application showed that by using a disordered material (random QPM), an extreme broad bandwidth was obtained, although at a price of severe reduction of the conversion efficiencies [14].…”

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confidence: 99%

Geometrical representation of sum frequency generation and adiabatic frequency conversion

et al. 2008

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We present a geometrical representation of sum frequency generation process in the undepleted pump approximation. The analogy of such dynamics with the known optical Bloch equations is discussed. We use this analogy to present a novel technique for the achievement of both high efficiency and large bandwidth in a sum frequency conversion processes using adiabatic inversion scheme, adapted from NMR and light-matter interaction. The adiabatic constraints are derived in this context. Last, this adiabatic frequency conversion scheme is realized experimentally by a proper design of adiabatic aperiodically poled KTP device, using quasi phased matched method. In the experiments we achieved high efficiency signal to idler conversion over a bandwidth of 140nm.PACS numbers: 42.65. Ky, 42.25.Fx, 42.70.Qs The generation of tunable frequency optical radiation typically relies on nonlinear frequency conversion in crystals. In this process, light of two frequencies is mixed in a nonlinear crystal, resulting in the generation of a third color with their sum or difference frequency. These three-wave mixing processes, also known as frequency up-conversion or frequency down-conversion are typically very sensitive to the incoming frequencies, owing to lack of phase matching of the propagating waves. Thus, angle, temperature or other tuning mechanisms are needed to support efficient frequency conversion. This difficulty is of particular importance when trying to efficiently convert broadband optical signals, since simultaneous phase matching of a broad frequency range is difficult.Solving the general form of the wave equations governing three wave mixing processes in nonlinear process is not an easy task. Under certain conditions these can be simplified to three nonlinear coupled equations. Further simplification can be applied when one incoming wave (termed pump) is much stronger than the other two. In the "undepleted pump" approximation, two linear coupled equation are obtained rather than three nonlinear ones [1]. In the case of sum frequency generation (SFG) process, this simplified system possesses SU(2) symmetry, sharing its dynamical behavior with other two states systems, such as nuclear magnetic resonance (NMR) or the interaction of coherent light with a two-level atom. In this letter we explore the dynamical symmetry of SFG process in analogy with the well known two level system dynamics [2]. We also apply a geometrical visualization using the approach presented by Bloch [3] and Feynman et al. [4] in NMR and light-matter interaction, respectively. The simple vector form of the coupling equation allows for new physical insight into the problem of fre- * Electronic address: Haim.suchowski@weizmann.ac.il quency conversion, enabling a more intuitive understanding of the effects of spatially varying coupling and phase mismatch. The utility of this approach is demonstrated by introducing a robust, highly efficient broadband color conversion scheme, based on an equivalent mechanism for achieving full population inversion in at...

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“…More generally there is a need to produce poled patterns that are not strictly periodic such as chirped PPLN, superstructured PPLN, transversed pattern PPLN etc [8,9,10]. In all these cases the additional structure in real space provides additional functionality (e.g.…”

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confidence: 99%

Harmonic generation in a two-dimensional nonlinear quasi-crystal

et al. 2005

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Second harmonic generation in a two dimensional nonlinear quasi-crystal is demonstrated for the first time. Temperature and wavelength tuning of the crystal reveal the uniformity of the pattern while angle tuning reveals the dense nature of the crystal's Fourier spectrum. These results compare well with theoretical predictions showing the excellent uniformity of the crystal and suggest that more complicated "nonlinear holograms" should be possible.

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Ultrashort-pulse second-harmonic generation with longitudinally nonuniform quasi-phase-matching gratings: pulse compression and shaping

Cited by 174 publications

References 31 publications

Theoretical and numerical investigations of parametric transfer via difference-frequency generation for indirect mid-infrared pulse shaping

Theoretical and numerical investigations of parametric transfer via difference-frequency generation for indirect mid-infrared pulse shaping

Geometrical representation of sum frequency generation and adiabatic frequency conversion

Harmonic generation in a two-dimensional nonlinear quasi-crystal

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