High-Brightness Tapered Lasers

Authored by: Ignacio Esquivias , Antonio Pérez-Serrano , José-Manuel G. Tijero

Handbook of Optoelectronic Device Modeling and Simulation

Print publication date:  October  2017
Online publication date:  October  2017

Print ISBN: 9781498749565
eBook ISBN: 9781315152318
Adobe ISBN:

10.4324/9781315152318-3

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Abstract

The brightness of an optical source is commonly defined as the emitted power per unit of emitting area and per unit of the solid angle into which the power is emitted (Walpole 1996). Therefore, a high-brightness source requires not only a high value of the emitted power but also a high “beam quality” in terms of a low product of the beam size and the beam divergence. The product of the beam radius at waist and the beam divergence half angle is called “beam parameter product” and based on it, the most widely used figure of merit for beam quality, the beam propagation ratio M 2 , is defined as the ratio of the beam parameter product of the beam of interest to the beam parameter product of a diffraction-limited, perfect Gaussian beam ( TEM 0 0 ) of the same wavelength λ (ISO 2005; Siegman et al. 1998). Therefore, a value M 2 = 1 represents an ideal diffraction-limited source, while values higher than unity indicate a degradation of the beam quality.

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