Peak Doubling in SPDC Coincidence Spectra with a Short-Pulse Pump

TL;DR

This paper explains the emergence of a double-peak structure in the coincidence spectra of biphoton states generated by SPDC with short-pulse pumps, due to the symmetry of the wave functions of identical bosons.

Contribution

It reveals the origin of the double-peak structure in SPDC coincidence spectra as a consequence of wave function symmetry, providing parameters and conditions for experimental observation.

Findings

Double-peak structure arises from wave function symmetry.

Parameters for peak observation are identified.

Conditions for experimental detection are established.

Abstract

We describe a double-peak structure of the coincidence spectrum of biphoton states in the process of spontaneous parametric down-conversion with a pump having the form of short pulses. The effect is shown to arise owing to the obligatory symmetry of bihoton wave functions, as wave functions describing states of two bozons obeying the Bose-Einstein statistics. Parameters of the peaks are found and conditions necessary for experimental observation of the effect are determined.