Dr. Stephen A. Bradshaw Profile

Dr. Stephen A. Bradshaw

Optical Programme Manager at STMicroelectronics

SPIE Involvement:

Author

Publications (1)

This will count as one of your downloads.

You will have access to both the presentation and article (if available).

DOWNLOAD NOW

This content is available for download via your institution's subscription. To access this item, please sign in to your personal account.

Email or Username Forgot your username?

Password Forgot your password?

Show

Keep me signed in

No SPIE account? Create an account

Proceedings Article | 10 April 1995 Paper

Edge-emitting laser arrays with a well-controlled transverse mode structure

John Marsh, K. McIlvaney, Stephen Bradshaw, F. Laughton, J. Gray

Proceedings Volume 2398, (1995) https://doi.org/10.1117/12.206335

KEYWORDS: Waveguides, Refractive index, Quantum wells, Semiconductor lasers, Optical filters, Superlattices, Cladding, Zinc, Spatial filters, Laser development

Read Abstract +

Broad stripe semiconductor lasers and laser arrays are capable of generating high optical output powers, but the transverse mode structure is generally poor. Two ways of improving the transverse mode structure by integrating spatial mode filters within the semiconductor lasers are discussed. Firstly, the far-field pattern of 980 nm broad area lasers has been improved by placing passive, low-loss slab waveguides on either side of the active region. Control devices exhibited a broad far-field spectrum (10 degree(s)) containing several peaks. Lasers with passive slab waveguides on both sides of the active region exhibited a single peak in the far-field spectrum, the divergence of which decreased as the length of the passive sections was increased. Secondly, novel antiguided arrays lasers have been fabricated by processes which are free of epitaxial regrowth stages. The operation of antiguided array lasers is dependent on the creation of an effective refractive index step between the antiguide core and the interelement regions. We describe the fabrication of five-element antiguided laser arrays at 1.48 micrometers in which undoped passive waveguiding layers have been added to the standard laser design. These waveguides significantly alter the shape of the far field emission from the lasers, showing that the array elements are pulled in-phase with each other. We also describe a second technique, using zinc diffusion to disorder a superlattice cladding layer, for creating the necessary index step in a ten-element antiguided laser array operating at 0.860 micrometers . Output powers approach 400 mW per facet into a 3^(DOT) (FWHM) beam.

My Library

You currently do not have any folders to save your paper to! Create a new folder below.

Folder Name

Folder Description

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks. You are receiving this notice because your organization may not have SPIE eBooks access.*

*Shibboleth/Open Athens users─please sign in to access your institution's subscriptions.

To obtain this item, you may purchase the complete book in print or electronic format on SPIE.org.

ORGANIZATIONAL
Sign in with credentials provided by your organization.

Organizational Username

Organizational Password

Show/Hide Password

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

;

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members:

Non-members: ADD TO CART

Keywords/Phrases

Search In:

Publication Years