7 May 2015 Spectral coherence of twin beams by single-shot measurements with a fiber spectrometer
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We observed the spectral coherence structure of twin beam states generated by spontaneous parametric down-conversion by using a simple fiber spectrometer synchronized with a pulsed laser source. The recorded single-shot spectra exhibit a well-defined peak structure, where the peak wavelengths change values from shot to shot. We studied the number and the width of the peaks as a function of the different parameters in the experimental setup (pump power, iris size, iris distance from the BBO crystal). Moreover, we evaluated the number of modes in the intensity distribution of the light in different portions of the spectrum. The experimental results indicate that the number of modes from statistics and the number and width of the peaks evolve differently with the parameters.
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Alessia Allevi, Alessia Allevi, Justinas Galinis, Justinas Galinis, Marco Lamperti, Marco Lamperti, Radek Machulka, Radek Machulka, Jan Peřina, Jan Peřina, Ondřej Haderka, Ondřej Haderka, Maria Bondani, Maria Bondani, "Spectral coherence of twin beams by single-shot measurements with a fiber spectrometer", Proc. SPIE 9505, Quantum Optics and Quantum Information Transfer and Processing 2015, 95050R (7 May 2015); doi: 10.1117/12.2178930; https://doi.org/10.1117/12.2178930

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