rus
Issue #1/2026
L. V. Gavrilenko, P. A. Bushuikin, D. I. Kuritsyn, E. E. Orlova, V. I. Gavrilenko, M. A. Fadeev, R. A. Khabibullin, A. A. Yantser, S. V. Morozov
Measurement of the Spatial Emission Pattern of a Wire THz Quantum Cascade Laser Using Longitudinal Movement of the Receiving Aperture
Measurement of the Spatial Emission Pattern of a Wire THz Quantum Cascade Laser Using Longitudinal Movement of the Receiving Aperture
DOI: 10.22184/1993-7296.FRos.2026.20.1.16.28
The spatial emission pattern of a quantum cascade laser (QCL) with a double metal waveguide with the subwavelength cross-sectional dimensions and a length significantly greater than the wavelength (wire laser) was examined using a hemispherical lens and a spacer (a plate separating the laser and the lens) in the laser’s near field and without them. The integrated emission power collected by an oversized waveguide with a circular aperture in a plane perpendicular to the longitudinal laser axis was measured as a function of the distance between the QCL and the receiver. A stepwise decrease in the received QCL emission power with increasing distance to the receiver was observed, specifying the radiance beam structure as the interference rings that extend beyond the receiving aperture’s field of view as it is moved away. When using the lens, a smooth longitudinal dependence of the received power was observed, demonstrating spatial separation of the interfering radiation contributions. The observed dependencies are in good agreement with the emission calculation of a wire laser in the model of two-point sources at its ends.
Subscribe to the journal Photonics Russia to read the full article.
The spatial emission pattern of a quantum cascade laser (QCL) with a double metal waveguide with the subwavelength cross-sectional dimensions and a length significantly greater than the wavelength (wire laser) was examined using a hemispherical lens and a spacer (a plate separating the laser and the lens) in the laser’s near field and without them. The integrated emission power collected by an oversized waveguide with a circular aperture in a plane perpendicular to the longitudinal laser axis was measured as a function of the distance between the QCL and the receiver. A stepwise decrease in the received QCL emission power with increasing distance to the receiver was observed, specifying the radiance beam structure as the interference rings that extend beyond the receiving aperture’s field of view as it is moved away. When using the lens, a smooth longitudinal dependence of the received power was observed, demonstrating spatial separation of the interfering radiation contributions. The observed dependencies are in good agreement with the emission calculation of a wire laser in the model of two-point sources at its ends.
Subscribe to the journal Photonics Russia to read the full article.
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