Beam divergence and waist measurements of laser diodes by near-field scanning optical microscopy

W. D. Herzog*, M. S. Ünlü, B. B. Goldberg, G. H. Rhodes, C. Harder

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

We demonstrate the use of near-field scanning optical microscopy (NSOM) for the measurement of the beam properties of single quantum well, graded index separate confinement heterojunction ridge laser diodes. Using NSOM, we measure the field intensity in the transverse plane at near field and as a function of distance from the facet. The divergence of the laser beam and the beam waists in vertical and lateral dimensions are directly measured and the astigmatism of the mode is determined. In the near field, we observe a nearly ideal Gaussian shape in the vertical dimension which is consistent with the beam divergence as measured in the far field. In the lateral dimension, the beam shape deviates from the ideal Gaussian since the mesa structure of the laser diode provides an effective step-index waveguide. The non-Gaussian structure of the mode is also observed in the beam divergence properties.

Original languageEnglish (US)
Pages (from-to)688-690
Number of pages3
JournalApplied Physics Letters
Volume70
Issue number6
DOIs
StatePublished - Feb 10 1997

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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