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Time evolution of pulsed far-field patterns of a GaAlAs phase-locked laser-diode array

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Abstract

The optical behavior of phase-locked GaAlAs laser diode arrays has been the subject of many recent studies. Typically laterally coupled arrays operate in multiple spectral and spatial supermodes.1,2 The higher-order spatial supermodes are favored by phase locking of the array elements out of phase, resulting in approximately double-lobed far-field patterns with intensity maxima 7–10° apart.1–3 The stability of these far-field patterns under cw and pulsed operation has been measured previously, where the measured far-field patterns were time-averaged.3 However, little has been reported on the time evolution of pulsed phase array far-field patterns. Recent work measured the fast pulse response of phase-locked arrays by using a streak camera,4 and the time delay to phase-locking was inferred to be 100 ps. This paper describes an independent measurement of the time evolution of the far field of a similar phase-locked array by using a different method. An independent determination of the delay time to phase locking was also obtained.

© 1986 Optical Society of America

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