Thesis

Theory of lasing, photon number squeezing and thermal emission in quantum dot nanolasers

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Awarding institution
  • University of Strathclyde
Date of award
  • 2025
Thesis identifier
  • T17292
Person Identifier (Local)
  • 201873864
Qualification Level
Qualification Name
Department, School or Faculty
Abstract
  • We develop quantum models capable of describing laser action from the fundamental limit β = 1 to the thermodynamic limit β → 0. By including the variables that describe incoherent and coherent emission we are able to fully characterise the laser threshold as a function of the pump power independent of system size. The case of the so-called “thresholdless” laser where β = 1 is examined and through bifurcation analysis the true laser threshold is found. The model equations are solved analytically as is the equation for the second-order intensity correlation. We show cases where antibunching is predicted and observe that there is a distinct path of emission for lasing devices as the pump is increased: from thermal to antibunching to coherent. We exploit antibunching regime that preceding the lasing regime by proposing a simple experimental setup capable of producing up to 3 dB photon number noise reduction in comparison with coherent emission. There is moderate output power in the range of pW and we show that effects due to pump fluctuations are negligible. We also show that in the thermodynamic limit our model is capable of recovering the classical laser threshold for macroscopic lasers.
Advisor / supervisor
  • Oppo, G.-L. (Gian-Luca)
  • Papoff, Francesco
Resource Type
DOI
Date Created
  • 2021

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