Broadband and Efficient Femtosecond Second-Harmonic Generation With Temperature-Dependent Group Velocity Matching

Zhang, Shuanggen; Zhai, Kaili; Ma, Xu; Hu, Minglie; Wang, Qingyue

doi:10.1109/jqe.2016.2592819

Cited by 4 publications

(1 citation statement)

References 23 publications

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“…So far, several approaches have been proposed to realize broadband QPM SHG. One of these is to use the dispersion property of QPM materials to obtain broadband QPM SHG with groupvelocity matching [1][2][3][4] (GVM) between the fundamental harmonic (FH) and second harmonic (SH) waves in periodically poled nonlinear crystals. Another method is to compensate the phase mismatch between interactive light waves through chirped nonlinear crystals, such as chirped periodically poled crystals [5,6], apodized chirped crystals [7], Bessel-chirped crystals [8] and chirped 2D nonlinear crystals [9].…”

Section: Introductionmentioning

confidence: 99%

Theoretical study on broadband second harmonic generation in periodically and aperiodically poled KTP

et al. 2018

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In this paper, the dispersion property of KTP is analyzed to calculate the group-velocity matching (GVM) wavelength at a given temperature. Then, first-order quasi-phasematching (QPM) broadband second harmonic generation (SHG) for two different types of interaction is studied at the calculated wavelength in periodically poled KTP (PPKTP). To broaden the acceptance bandwidth of QPM SHG, a structure of aperiodically poled KTP (APPKTP) is designed using a genetic algorithm with the QPM and GVM conditions satisfied simultaneously. Next, the broadband property of APPKTP is studied. Research shows that, for type-I QPM, the bandwidth at the communication band is ~1.9 nm in a 10 mm long PPKTP crystal with a set temperature of 22 °C, while a wide acceptance bandwidth of 73.9 nm can be obtained at the same waveband for type-II QPM, with the conversion efficiency decreasing to 4.64%. In addition, the maximum available acceptance bandwidths are ~9.3 nm for type-I QPM and 417.1 nm for type-II QPM, using the APPKTP designed above. The tradeoff between bandwidth and conversion efficiency is also discussed.

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Section: Introductionmentioning

confidence: 99%

Theoretical study on broadband second harmonic generation in periodically and aperiodically poled KTP

et al. 2018

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Broadband quasi-phase-matched optical parametric generation in phase reversal optical superlattice devices

Meetei

Meerasha

Madhupriya

et al. 2020

Optik

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Analytic model for the complex effective index of the leaky modes of tube-type anti-resonant hollow core fibers

Zeisberger

Schmidt

2017

Sci Rep

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Due to their promising applications, hollow-core fibers, in particular, their anti-resonant versions, have recently attracted the attention of the photonics community. Here, we introduce a model that approximates, using the reflection of a wave on a single planar film, modal guidance in tube-type anti-resonant waveguides whose core diameters are large compared to the wavelength. The model yields analytic expressions for the real and imaginary parts of the complex effective index of the leaky modes supported, and is valid in all practically relevant situations, excellently matching all the important dispersion and loss parameters. Essential principles such as the fourth power dependence of the modal loss on the core radius at all wavelengths and the geometry-independent transition refractive index, below which modal discrimination favors the fundamental mode are discussed. As application examples, we use our model for understanding higher-order mode suppression in revolver-type fibers and for uncovering the tuning capabilities associated with nonlinear pulse propagation.

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Broadband and Efficient Femtosecond Second-Harmonic Generation With Temperature-Dependent Group Velocity Matching

Cited by 4 publications

References 23 publications

Theoretical study on broadband second harmonic generation in periodically and aperiodically poled KTP

Theoretical study on broadband second harmonic generation in periodically and aperiodically poled KTP

Broadband quasi-phase-matched optical parametric generation in phase reversal optical superlattice devices

Analytic model for the complex effective index of the leaky modes of tube-type anti-resonant hollow core fibers

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