The calculation of the coherence time of spectral supercontinuum at the output of the fused silica with different parameters of the initial pulse

M. V. Melnik; A. N. Tsypkin

doi:10.1117/12.2061863

5 September 2014 The calculation of the coherence time of spectral supercontinuum at the output of the fused silica with different parameters of the initial pulse

M. V. Melnik, A. N. Tsypkin

Author Affiliations +

Proceedings Volume 9200, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VIII; 92000W (2014) https://doi.org/10.1117/12.2061863
Event: SPIE Optical Engineering + Applications, 2014, San Diego, California, United States

Abstract

In this paper the dependence of the coherence time of a femtosecond spectral supercontinuum from different initial pulse parameters - wavelength, peak intensity and duration is studied. The obtained dependences and ratio of the coherence time of the pulse to the duration of the pulse at the output are analyzed. It is shown that in the case of femtosecond spectral supercontinuum generation in fused silica in the areas of normal, anomalous and zero group velocity dispersion, with an increase of the central wavelength of the femtosecond laser pulse at the input, the coherence time of the radiation with ultra-wide spectrum is significantly decrease. However, in the region of zero group velocity dispersion of fused silica there is a "leap" of the coherence time. For example, for the initial pulse duration of 40 fs at 800 nm, the coherence time is 22 fs. With the increase of wavelength, the coherence time reduces to 4 fs at a wavelength of 1180 nm. In the area of zero group velocity dispersion, the coherence time increases dramatically to 20 fs, after which it decreases, reaching a minimum of 4 fs at a wavelength of 1560 nm.

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M. V. Melnik and A. N. Tsypkin "The calculation of the coherence time of spectral supercontinuum at the output of the fused silica with different parameters of the initial pulse", Proc. SPIE 9200, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VIII, 92000W (5 September 2014); https://doi.org/10.1117/12.2061863

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KEYWORDS

Dispersion

Femtosecond phenomena

Silica

Supercontinuum generation

Coherence (optics)

Nonlinear optics

Refractive index

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