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Date:         Tue, 25 Nov 2008 00:02:28 +0200
Reply-To:     Joe van Zwaren <[log in to unmask]>
Sender:       Optics Newsletter <[log in to unmask]>
From:         Joe van Zwaren <[log in to unmask]>
Subject:      Optics-L: TAU EE Dept. Seminar by Dr. Michael G. Noppe,
              Thursday December 1, 2008 at 15:00, Room 011,
              Wolfson Eng. Classroom Bldg
Content-Type: multipart/mixed;

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From: Esther Zilka <[log in to unmask]> Shalom, Please find attached a seminar from the Dept. of Physical Electronics for your information and distribution (if relevant). Thank you, Esther*.* *The seminar will take place on **Monday** December 1,at 15:00,* * Room 011** at the Faculty of Engineering,Wolfson Classroom Bldg.* * * ** * * * * SEMINAR * * * * **** *NONLINEAR LASER THEORY AND NATURAL* * LINEWIDTH IN SEMICONDUCTOR LASERS abst2* * * *Dr. Michael G. Noppe* Novosibirsk State Technical University, Novosibirsk, Russia * * *Contents*** 1. Introduction 2. Some experimental measurements of natural linewidth 3. Short review of theoretical approaches to the description of natural linewidth 4. Approach to the problem being developed 5. Formula for the laser line form 6. Formula for the effective natural linewidth 6.1. On determination and some properties of effective natural linewidth 6.2. Exact formula for the effective natural linewidth 6.3. Linear approximation of effective natural linewidth for universal function F0(q) 7. Primary and secondary spontaneous fluctuations 8. Deriving gain for low- and high-power laser radiation 8.1. Gain for low-power laser radiation 8.2. Gain for high-power laser radiation 9. Nonlinear laser theory and effective natural linewidth formula for output laser radiation *10. Some results of calculations of effective natural linewidth* 11. Conclusions Laser semiconductor laser theory is developed, adopting an approach which is based on the following basic concepts: applying a spatially-distributed laser model; applying an experimental formula for laser frequency depending on the laser amplitude. The derived formula for the laser line form differs from the Lorentz profile. Effective natural linewidth is defined and its properties are considered. The exact formula and linear approximation formula for the effective natural linewidth are derived. Physical representations of secondary spontaneous fluctuations are formulated. Formulas for gain for low- and high-power laser are derived and they demonstrate the main nonlinear effect dependence of gain upon energy density. Effective natural linewidth is calculated after solving the nonlinear system of equations, basing on the generalized Poynting theorem. Thus, the theory of natural linewidth is an integral part of the nonlinear theory on the basis of which the output power, linewidth, and threshold current for Fabry-Perot semiconductor lasers are calculated. Thecalculations made allow explaining some experimental measurements of natural linewidth for the Fabry-Perot semiconductor lasers. The talk might be of interest to researchers, specialists, postgraduate and undergraduate students.
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