SPATIAL FIELD CONTROL OF BROAD AREA SEMICONDUCTOR LASERS WITH INTEGRATED GRATING COUPLERS

Search for this publication on Google Scholar
Smolski, V. (2012). SPATIAL FIELD CONTROL OF BROAD AREA SEMICONDUCTOR LASERS WITH INTEGRATED GRATING COUPLERS. Unc Charlotte Electronic Theses And Dissertations.
Download PDF

Analytics

60 views ◎
33 downloads ⇓


Abstract

In this research, a method of designing a grating outcoupler to obtain the desired 2D-intensity profile and improved field distribution of the optical beam emitted by a grating coupled surface emitting laser is presented. The method is based on variation of the periodicity, duty cycle, and the groove tilt angle of the grating. Grating design involves numerical analysis of the optical field propagated through the grating, by applying the Rigorous Coupled Wave Approach method. Experimental evaluation of the designed grating components was done by fabrication and testing the broad area semiconductor lasers with the monolithically integrated grating outcouplers. Another grating design is presented that provides the spreading of a single optical output into multi-beams at different outcoupling angles in the emitting plane. Using field distribution presentation, an approach to provide uniform optical intensity profile from the grating outcoupler based on varying duty cycle is described.Furthermore, this work presents experimental evaluation of 1D, and 2D (8x8) square, arrays of phase-locked surface-emitters including semiconductor optical amplifiers spaced by grating outcouplers. The phase-locked multi-emitter design was based on the master oscillator power amplifier (MOPA) array approach. As the MO for the 1D array we used a monolithically integrated grating coupled laser with wavelength stabilization and a fiber coupled external laser source was used for the 2D array. Mutual coherence was experimentally evaluated by interference investigation and the obtained results were compared to numerical modeling.

Details
Author

Smolski, Viktor

Title

SPATIAL FIELD CONTROL OF BROAD AREA SEMICONDUCTOR LASERS WITH INTEGRATED GRATING COUPLERS

Physical Description

1 online resource (130 pages) : PDF

Date

2012

Degree Granting Institution

University of North Carolina at Charlotte

Abstract

In this research, a method of designing a grating outcoupler to obtain the desired 2D-intensity profile and improved field distribution of the optical beam emitted by a grating coupled surface emitting laser is presented. The method is based on variation of the periodicity, duty cycle, and the groove tilt angle of the grating. Grating design involves numerical analysis of the optical field propagated through the grating, by applying the Rigorous Coupled Wave Approach method. Experimental evaluation of the designed grating components was done by fabrication and testing the broad area semiconductor lasers with the monolithically integrated grating outcouplers. Another grating design is presented that provides the spreading of a single optical output into multi-beams at different outcoupling angles in the emitting plane. Using field distribution presentation, an approach to provide uniform optical intensity profile from the grating outcoupler based on varying duty cycle is described.Furthermore, this work presents experimental evaluation of 1D, and 2D (8x8) square, arrays of phase-locked surface-emitters including semiconductor optical amplifiers spaced by grating outcouplers. The phase-locked multi-emitter design was based on the master oscillator power amplifier (MOPA) array approach. As the MO for the 1D array we used a monolithically integrated grating coupled laser with wavelength stabilization and a fiber coupled external laser source was used for the 2D array. Mutual coherence was experimentally evaluated by interference investigation and the obtained results were compared to numerical modeling.

Genre

doctoral dissertations

Subjects--Topics

Electrical engineering
Optics

Degree

Ph.D.

Keywords

Beam Shaping
Coherent Beam Combining
Grating Coupler
Grating Coupling Surface Emitter
Laser Diode Array
Semiconductor Laser Diodes

Subject Area

Electrical Engineering

Advisor(s)

Johnson, Eric

Committee Members

Stokes, Edward
Fiddy, Michael
Boreman, Glenn
Ferguson, Ian
Noras, Maciej

Degree Note

Thesis (Ph.D.)--University of North Carolina at Charlotte, 2012.

Rights Statement

This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s). For additional information, see http://rightsstatements.org/page/InC/1.0/.

Rights Holder Information

Copyright is held by the author unless otherwise indicated.

Identifier

Smolski_uncc_0694D_10345

Permalink

http://hdl.handle.net/20.500.13093/etd:1427