New Optimized Band-Pass Filter To Increase Optical Temporal Coherence of Thermal Light

TL;DR

This paper introduces an optimized band-pass filter designed to enhance the optical temporal coherence of thermal light by selecting the most intense frequency interval in black-body radiation, maximizing coherence length for a given energy.

Contribution

The paper presents a novel method for designing a band-pass filter based on solving an optimization problem to maximize coherence length in thermal light.

Findings

Optimized filters increase coherence length significantly.

Analytical formulas for optimal interval selection.

Maximum coherence achieved at specific narrow frequency bands.

Abstract

A new optimized band-pass filter for wavelengths is proposed to increase the optical temporal coherence of thermal light. The choice of parameters for this filter is based on solving an optimization problem for finding the most intensely emitted frequency interval in the black-body radiation spectrum. The calculated frequency interval is also the narrowest band for the coherence filter for a given value of the total transmitted energy. As a result, the interval found can be used to achieve the highest possible coherent properties at a given level of total energy that has passed. The achieved coherence length values for such optimized band-pass filters are calculated. Analytical results are given for finding optimal intervals and calculating the coherence of optimized filters.