Focusing characteristics of a wide-striped laser diode integrated with a microlens

Author

Shimada, Jun-ichi ; Ohguchi, Osamu ; Sawada, Renshi

Author_Institution

NTT Interdisciplinary Res. Labs., Tokyo, Japan

Volume

12

Issue

6

fYear

1994

fDate

6/1/1994 12:00:00 AM

Firstpage

936

Lastpage

942

Abstract

We developed a wide-striped laser diode integrated with a microlens that provides good focusing characteristics through a small focusing spot. We calculated and demonstrated that a 60-μm-wide core and a 1.9-μm-high ridge is the best structure for fundamental index-guiding mode oscillation of a wide-striped laser diode. We integrated a wide-striped laser diode with the developed microlens in the Fresnel diffraction held, and demonstrated that a device with a 60-μm-wide core has a minimum focusing spot width of 2.0 μm in the horizontal direction. Also, we estimated the wavefront in the Fresnel diffraction field from the working distance error of a lens designed for a collimated incident beam, and showed that the working distance error, focusing spot width, and sidelobe can be improved by this estimated wavefront

Keywords

focusing; integrated optics; laser accessories; laser beams; laser modes; lenses; semiconductor lasers; 1.9 micron; 2.0 micron; 60 micron; Fresnel diffraction; collimated incident beam; core; focusing spot width; fundamental index-guiding mode oscillation; integrated microlens; ridge; sidelobe; wavefront; wide-striped laser diode; working distance error; Collimators; Diffraction; Diode lasers; Dry etching; Focusing; Laser beams; Lenses; Microoptics; Optical design; Sputtering;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.296181

Filename

296181