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Ring cavity induced threshold reduction in single-mode surface emitting quantum cascade lasers
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View: Figures


Image of FIG. 1.
FIG. 1.

Peak optical power and voltage vs current density characteristics of a RCSE QCL with a grating period of at different temperatures. The inset shows a scanning electron microscopy image of a waveguide section holding the DFB gratings.

Image of FIG. 2.
FIG. 2.

Emitted light and voltage vs current density curves of a RCSE and FP QCL at a temperature of 293 K. The geometry of the FP emitter is , which gives an area comparable to RCSE QCLs (with a radius of and a width of ).

Image of FIG. 3.
FIG. 3.

(a) Single-mode spectrum of a device with taken at a current density of and 293 K. (b) Surface emission single-mode spectra recorded at different temperatures for a grating period of . (c) Linear tuning of the resonance by means of five different grating periods. The inset illustrates the corresponding optical power curves.

Image of FIG. 4.
FIG. 4.

Measured (left half) and simulated (right half) surface emission far-field pattern. The far fields are concentric with respect to device axis, and are represented by one half only. The angular position is given by sin , where is the angle between the device center and the free-space wave vector, is the diffraction order, is free-space wavelength, and is the device diameter. Inset shows a three-dimensional representation of the recorded data.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ring cavity induced threshold reduction in single-mode surface emitting quantum cascade lasers