Journals Information
Universal Journal of Physics and Application Vol. 18(2), pp. 7 - 12
DOI: 10.13189/ujpa.2024.180201
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An Estimate of Laser Power Rate from a Simple Lasing Model based on Maxwell Equations
Sujit K. Bose *
S.N. Bose National Center for Basic Sciences, Salt Laka City, Kolkata 700106, West Bengal, India
ABSTRACT
A semi-conductor laser essentially consists of thin layers of p and n materials in perfect contact across which a bias current can be applied that triggers flow of electrons into the holes of the junction diode, spontaneously emitting nearly monochromatic light. The junction of the diode is thus the actual active region of the device. Commonly a laser comes in a rectangular shape termed edge-emitting laser and sometimes in a surface-emitting cylindrical shape. Here in this paper, an edge-emitting type laser is studied using a simple model of diffusion of the randomly moving electrons and consequent emission of quasi-monochromatic beam of light. The shape of the beam is assumed to be of elliptic conical shape because of the width of the strip. The actual process however is complex for which other approaches ranging from simple balance to quantum mechanical, have been adopted by others. The theories in fine, express the rate of the power of the spontaneously emitted light. Likewise, estimate of the power rate is obtained here adopting the simple diffusive model of the charged carriers. The lasing field and that of the emergent light beam are both assumed to be governed by Maxwell equations of electromagnetism as both of the fields are electromagnetic in nature. The estimate of power rate of the photon density function of the emergent light is obtained from that of the rate of the spontaneously generated power of lasing. An approximation to the power rate of the beam is also given. Consideration of stimulated emission by multiple reflections within the device is also provided.
KEYWORDS
Edge Emitting Laser, Diffusion of Charge Carriers, Spontaneous Photon Emission, Resonant Cavity, Maxwell Equations, Elliptic Beam
Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Sujit K. Bose , "An Estimate of Laser Power Rate from a Simple Lasing Model based on Maxwell Equations," Universal Journal of Physics and Application, Vol. 18, No. 2, pp. 7 - 12, 2024. DOI: 10.13189/ujpa.2024.180201.
(b). APA Format:
Sujit K. Bose (2024). An Estimate of Laser Power Rate from a Simple Lasing Model based on Maxwell Equations. Universal Journal of Physics and Application, 18(2), 7 - 12. DOI: 10.13189/ujpa.2024.180201.