Spectral coherence of twin beams by single-shot measurements with a fiber spectrometer

Alessia Allevi; Justinas Galinis; Marco Lamperti; Radek Machulka; Jan Peřina Jr.; Ondřej Haderka; Maria Bondani

doi:10.1117/12.2178930

7 May 2015 Spectral coherence of twin beams by single-shot measurements with a fiber spectrometer

Alessia Allevi, Justinas Galinis, Marco Lamperti, Radek Machulka, Jan Peřina Jr., Ondřej Haderka, Maria Bondani

Proceedings Volume 9505, Quantum Optics and Quantum Information Transfer and Processing 2015; 95050R (2015) https://doi.org/10.1117/12.2178930
Event: SPIE Optics + Optoelectronics, 2015, Prague, Czech Republic

Abstract

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.

Citation Download Citation

Alessia Allevi, Justinas Galinis, Marco Lamperti, Radek Machulka, Jan Peřina Jr., Ondřej Haderka, and 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); https://doi.org/10.1117/12.2178930

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