High-coherent-power, Two-dimensional Grating Surface-emitting (GSE) Semiconductor Lasers PDF Download
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Author: Shuang Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 164
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Author: Shuang Li
Publisher:
ISBN:
Category :
Languages : en
Pages : 164
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Author: G. A. Evans
Publisher:
ISBN:
Category :
Languages : en
Pages : 4
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Book Description
A sketch of a grating-surface-emitting (GSE) laser is shown. The gratings between the gain sections provide feedback for laser oscillation in second order and couple out the laser radiation perpendicular to the surface in both directions in first order. With proper choice of grating parameters, a portion of the light is passed completely through each grating section and serves to injection lock additional gain sections in the longitudinal direction. GSE laser array technology has experienced steady progress over the last two years. Improvements in material quality and uniformity have made it possible to coherently couple two dimensional GSE lasers over distances larger than 1 cm. Figure 2a shows a peak output of 32 W per surface with differential quantum efficiencies of 40 % per surface during pulsed operation. The same device provides a continuous power output of 3.4 W per surface, as shown in Fig. 2b. Variations on the basic GSE laser concept have resulted in Master Oscillator Power Amplifier (MOPA) GSE arrays and continuous grating (CG)-GSE laser arrays. GSE arrays with 10 elements per gain section and 20 gain sections have obtained cw threshold current densities of under 140 A/cm2 with cw differential quantum efficiencies of 20 to 30% per surface. Linewidths in the 40 to 100 MHz range have been obtained with output powers of 100 to 250 mW/surface.
Author: Nils W. Carlson
Publisher: Springer Science & Business Media
ISBN: 3642789420
Category : Science
Languages : en
Pages : 405
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Book Description
Although semiconductor-diode lasers are the most compact, highest gain and most efficient laser sources, difficulties remain in developing structures that will produce high-quality, diffraction-limited output beams. Indeed, only a few designs have emerged with the potential for producing high-power, high-brightness monolithic sources. This book presents and analyzes the results of work performed over the past two decades in the development of such diode-laser arrays.
Author: Gary A. Evans
Publisher:
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 528
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Book Description
Reviews all the basic types of surface emitting semiconductor lasers, including vertical cavity, etched-mirror integrated beam deflectors and grating out-coupled devices. The book also addresses such topics as edge-emitting arrays, thermal management and coherence.
Author: Niklas Eriksson
Publisher:
ISBN: 9789171971975
Category :
Languages : en
Pages : 27
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Author:
Publisher:
ISBN:
Category : Electrooptics
Languages : en
Pages : 584
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Author:
Publisher:
ISBN:
Category : Electrooptics
Languages : en
Pages : 772
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Author: Optical Society of America
Publisher: Institute of Electrical & Electronics Engineers(IEEE)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 584
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Author: Yangfei Shen
Publisher:
ISBN:
Category : Diffraction gratings
Languages : en
Pages : 51
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Book Description
A distributed feedback laser (DFB) is a type of semiconductor laser where the cavity is periodically structured as a diffraction grating. This allows the same grating region to act as a resonator, out-coupler and the gain region simultaneously. While conventional DFB lasers emit light along its edges, by modifying the grating structure, it is possible to make the output appear from the top surface. This is known as the surface-emitting DFB laser. This thesis will discuss the case in which a two-dimensional grating (which consists of a 2D grid of holes or pillars) etched into the top cladding surface of the waveguide. The thesis consists of four main parts. For the first part, we give the background principles and the coupled wave equations with radiation modes. In the second part, we derive the equations for a waveguide that utilizes a grating strip for guidance. The effective index of this guide is then used in the 2D DFB crossed grating structure. The third part begins with calculations of a particular GaAs:GaAlAs waveguide geometry with a grating. We present the fundamental resonant modes by utilizing the numerical shooting method. Then, the matrix solution method is applied in the calculation of the higher order guided and radiation modes. In the last part, we solve the transcendental equations for the eigenvalues to get the threshold gain and near field radiation pattern from the DFB surface.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 924
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