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Date:         Sun, 5 Jun 2011 22:55:19 +0300
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 Seminar on 12 June,
              2011 at 15:00 - Prof. Shlomo Ruschin: The Gaussian Content: an
              alternative method of evaluating the quality of coherent beams
Content-Type: multipart/mixed;


------------------------------ TEL AVIV UNIVERSITY Physical Electronics Dept. *סמינר מחלקתי*** * * *Prof. Shlomo Ruschin*, *Department of Physical Electronics, School of Electrical Engineering, * *Faculty of Engineering, Tel-Aviv University* *The Gaussian Content: an alternative method of evaluating the quality of coherent beams* The definition of a parameter that evaluates the quality of laser beams has been a controversial issue for more than two decades. Presently there is a widespread consensus that there is no single beam quality parameter suitable for all scenarios, and therefore, specific quality factors are often defined and chosen by practical considerations depending on the application. From all the proposed options the M2 factor gained recognition as the best acknowledged quality parameter for laser beams and even acquired standardization. In some instances however the M2 parameter happened to be inadequate for describing the suitability of a source for important applications one of them being Coherent Beam Combining*. *In this talk, I will briefly critically review some of the common figures of merit for evaluating laser beams, and propose a new parameter: The Gaussian Content. As defined it is suited for applications where the coherence properties of light at the target are of preference. The coherent combination of an array of laser beams and the optimal coupling between a diode laser and a single-mode fiber (SMF) will be elaborated as application examples. Experimental results on the measurement of the Gaussian Content and its conservation upon propagation will be shown. *ההרצאה תתקיים ביום ** **א', **12.6.2011**, בשעה 15:00 , חדר 206, בבניין וולפסון מכונות, *** *הפקולטה להנדסה, אוניברסיטת תל-אביב***

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