DocumentCode :
1101093
Title :
Nonlinear analysis of Y-junction laser arrays
Author :
Streifer, William ; Welch, David F. ; Berger, Josef ; Scifres, Donald R.
Author_Institution :
Spectre Diode Lab., San Jose, CA, USA
Volume :
25
Issue :
7
fYear :
1989
fDate :
7/1/1989 12:00:00 AM
Firstpage :
1617
Lastpage :
1624
Abstract :
An analysis of Y-junction arrays above threshold is presented. The analysis incorporates nonlinear gain saturation and shows that the gain becomes nonuniform above threshold even if the array is otherwise ideal. The nonuniform, nonlinear gain saturation causes the near field and the radiation patterns to deteriorate with increasing output power. Although the far-field lobe width does not necessarily increase greatly above threshold, the Strehl ratio may decrease significantly depending on the device design. Empirically, it is found that, when the Strehl ratio decreases to approximately 0.7, the second-order array mode attains threshold and both the first and second array modes lase simultaneously. An improved design, whose far-field Strehl ratio remains 0.85 even well in excess of 1 W output power and in which the second-order array mode never attains threshold, is discussed
Keywords :
laser modes; optical saturation; optical waveguide theory; semiconductor junction lasers; Strehl ratio; Y-junction laser arrays; far-field lobe width; first-order array mode; near field; nonlinear gain saturation; radiation patterns; second-order array mode; Laser modes; Laser noise; Optical arrays; Optical waveguides; Power generation; Power lasers; Semiconductor diodes; Semiconductor laser arrays; Waveguide junctions; Waveguide lasers;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/3.29303
Filename :
29303
Link To Document :
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