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<p>The correlation of light from two sources leads to an interference pattern if they belong to a specific time interval known as the coherence time, denoted as Δ<i>τ</i>. The relationship governing this phenomenon is Δ<i>τ</i>Δ<i>ν</i> ≈ 1, where Δ<i>ν</i> represents the bandwidth of the light. This requirement is not satisfied; hence, interference fringes are not observable in the case of ordinary (thermal) light. In the 1950s, Robert Hanbury Brown and Richard Q. Twiss explored interference phenomena using a narrow bandwidth of thermal light. This investigation led to the discovery of the Hanbury Brown and Twiss effect (or the HBT effect in short), which has since found applications in various fields, particularly stellar observations and quantum optics. This article briefly traces the history of the HBT effect and its applications in various fields, including stellar observations. More importantly, it outlines the basic theoretical framework of the HBT effect and presents the design and results of the correlation in intensity fluctuation of a pseudo-thermal light in a college laboratory setting (Michelson interferometer).</p>

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Interference with (Pseudo) Thermal Light

  • 期刊论文

  • 发表日期：

    2025年1月1日

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  • Km Nitu Rai,
  • Soumen Basak,
  • Subrata Sarangi,
  • Prasenjit Saha

摘要

The correlation of light from two sources leads to an interference pattern if they belong to a specific time interval known as the coherence time, denoted as Δτ. The relationship governing this phenomenon is ΔτΔν ≈ 1, where Δν represents the bandwidth of the light. This requirement is not satisfied; hence, interference fringes are not observable in the case of ordinary (thermal) light. In the 1950s, Robert Hanbury Brown and Richard Q. Twiss explored interference phenomena using a narrow bandwidth of thermal light. This investigation led to the discovery of the Hanbury Brown and Twiss effect (or the HBT effect in short), which has since found applications in various fields, particularly stellar observations and quantum optics. This article briefly traces the history of the HBT effect and its applications in various fields, including stellar observations. More importantly, it outlines the basic theoretical framework of the HBT effect and presents the design and results of the correlation in intensity fluctuation of a pseudo-thermal light in a college laboratory setting (Michelson interferometer).