Silent White Light

TL;DR

This paper models how quantum dot gain media can manipulate broadband light statistics from thermal to Poissonian, enabling silent white light with reduced intensity noise for advanced optical applications.

Contribution

It introduces a theoretical model showing how temperature-tuned quantum dot dynamics can control photon statistics, achieving noise reduction in broadband light.

Findings

Demonstrates transition from thermal to Poissonian statistics

Shows intensity noise reduction via quantum dot saturation effects

Proposes applications in optical coherence and communication

Abstract

We investigate the intra-waveguide statistics manipulation of broadband light by combining semiconductor quantum dot physics with quantum optics. By cooling a quantum dot superluminescent diode to liquid nitrogen temperature of $77K$, Blazek et al. [Phys. Rev. A 84, 63840 (2011)] have demonstrated a temperature-dependent reduction of the second-order intensity correlation coefficient from two for thermal amplified spontaneous emission light to $g^{(2)}(T=190 K)\approx 1.33$. Here, we model the broadband photon statistics assuming amplified spontaneous emission radiation in a pumped, saturable quantum dot gain medium. We demonstrate that, by an intensity increase due to the quantum dot occupation dynamics via the temperature-tuned quasi Fermi levels, together with the saturation nonlinearity, a statistics manipulation from thermal Bose-Einstein statistics towards Poissonian statistics can be realized, thus producing "silent white light". Such intensity-noise reduced broadband radiation is relevant for many applications like optical coherence tomography, optical communication or optical tweezers.