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Numerical Study of the Dynamics of Laser Lineshape and Linewidth

100%
Eskef M.
Acta Physica Polonica A
|
2016
|
vol. 130
|
issue 3
710-717
EN
A rate equations model for lasers with homogeneously broadened gain is written and solved in both time and frequency domains. The model is applied to study the dynamics of laser lineshape and linewidth using the example of He-Ne laser oscillating at λ = 632.8 nm. Saturation of the frequency spectrum is found to take much longer time compared to the saturation time of the overall power. The saturated lineshape proves to be Lorentzian, whereas the unsaturated line profile is found to have a Gaussian peak and a Lorentzian tail. Above threshold, our numerical results for the linewidth are in good agreement with the Schawlow-Townes formula. Below threshold, however, the linewidth is found to have an upper limit defined by the spectral width of the pure cavity. Our model provides a unique and powerful tool for studying the dynamics of the frequency spectrum for different kinds of laser systems, and is also applicable for investigating lineshape and linewidth of pulsed lasers.
2
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Extended Rate Equations Model for Describing the Dynamics of the Laser Frequency Spectrum

100%
Eskef M.
Acta Physica Polonica A
|
2012
|
vol. 121
|
issue 3
599-605
EN
Laser rate equations are written and solved in the frequency domain for homogeneous as well as for inhomogeneous gain. The resulting laser model is capable of describing the fine structure as well as the dynamics of the laser frequency spectrum. The calculation shows that laser lines have a Lorentzian-like lineshape. The linewidth is found to be close to the spectral width of the cavity in case of inhomogeneous gain, whereas it is proved to approach the quantum limit for homogeneous gain.
3
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Analysis of Gain-Switching in Two-Section Tapered Lasers

80%
Adamiec P., Tijero J., Esquivias I.
Acta Physica Polonica A
|
2013
|
vol. 124
|
issue 5
888-890
EN
We analyze the gain-switching dynamics of two-section tapered lasers by means of a simplified three-rate-equation model. The goal is to improve the understanding of the underlying physics and to optimize the device geometry to achieve high power short duration optical pulses.
4
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Two-Frequency Lasers: from Excess Quantum Noise to RF Photonics Applications

70%
Alouini M., Bretenaker F., Brunel M., Chauvat D., Emile O., Lai N., Le Floch A., Ropars G., Vallet M.
Acta Physica Polonica A
|
2002
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vol. 101
|
issue 1
7-20
EN
We illustrate the physics of two-frequency lasers by two examples. The first example illustrates the fundamental consequences of the existence of two eigenstates on the laser line width. We indeed show experimentally that the non-orthogonality of these two eigenstates results in an increase in the laser quantum noise. We also give a physical explanation of this vectorial excess noise factor. The second example illustrates the capabilities of two-frequency lasers in terms of applications. In the domain of RF frequency generation by optical means, we show how a pulsed two-frequency source can be built for lidar-radar applications and pulsed RF frequency generation.
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