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Diffraction-Limited Infrared-Imaging of the Near-Field Intensity Emitted by Quantum-Cascade Lasers

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6 Author(s)
Kinzer, M. ; Fraunhofer Inst. for Appl. Solid State Phys., Freiburg, Germany ; Yang, Q.K. ; Hugger, S. ; Brunner, M.
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The near-field intensity distributions of quantum-cascade lasers emitting at λ = 7.7 μm were investigated with a Gaussian telescope, comprising standard optical components together with a microbolometer focal plane array. Although the technique is operated at the diffraction limit, the quality of the near-field patterns obtained allows unambiguous determination of the lateral-mode structure of the laser even for individual laser pulses. The high quality of the recorded near-field intensity distribution allows us to calculate analytically the corresponding far-field intensity distributions, leading to an excellent match with measured far-field patterns. The present experimental technique allows fast and efficient characterization of the beam propagation properties of mid-infrared semiconductor lasers.

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Quantum Electronics, IEEE Journal of  (Volume:48 ,  Issue: 5 )