Title :
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
fDate :
6/1/1994 12:00:00 AM
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;
Journal_Title :
Lightwave Technology, Journal of
