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Improved performance of quantum cascade laser with porous waveguide structure
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10.1063/1.4733696
/content/aip/journal/jap/112/1/10.1063/1.4733696
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/1/10.1063/1.4733696
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(a) The scheme of QCL with porous structure. The 3D model and simplified device structure cross section are both represented. (b) Scanning electron microscope image of the cross-section profile of the porous structure taken from the position A in (a), the passivation layer and straight-hole area are marked.

Image of FIG. 2.
FIG. 2.

The scheme of the electrochemical etching facility by a simple three-electrode cell. ① is Pt negative electrode, ② is reference SCE, and ③ is gold positive electrode.

Image of FIG. 3.
FIG. 3.

(a) Simulated and measured far fields of 60 μm-ridge-width QCL with porous structure under different injected current: 3500 mA, 4000 mA, and 4400 mA, pulsed operation at room temperature. The inset shows the far field of F–P cavity QCL with the same ridge width. (b) Simulated and measured far fields of 50 μm-ridge-width QCL with porous structure under different injected current: 3500 mA, 4000 mA, and 4500 mA, pulsed operation at room temperature. The inset shows the far field of F–P cavity QCL with the same ridge width.

Image of FIG. 4.
FIG. 4.

The figure of merit of 60 μm-ridge-width QCL with and without porous structure.

Image of FIG. 5.
FIG. 5.

(a) Pulsed operation P-I characteristics of 60 μm-ridge-width F–P cavity QCL (black line) and QCL with porous structure (red line) at room temperature. (b) Pulsed operation P-I characteristics of 50 μm-ridge-width F–P cavity QCL (black line) and QCL with porous structure (red line) at room temperature.

Image of FIG. 6.
FIG. 6.

(a) The normalized lasing spectra of QCL with porous structure in pulsed mode at 1.05Ith for different heat-sink temperatures from 20 °C to 40 °C. The inset shows the central wavelength shift as a function of temperature. The black solid squares are measurement results and the green line is the fitting result. (b) The normalized lasing spectrum of F–P QCL in pulsed mode at 1.05Ith current at 30 °C.

Image of FIG. 7.
FIG. 7.

Current density vector distribution on the cross section of 60 μm-ridge-width QCL with porous structure.

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/content/aip/journal/jap/112/1/10.1063/1.4733696
2012-07-11
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Improved performance of quantum cascade laser with porous waveguide structure
http://aip.metastore.ingenta.com/content/aip/journal/jap/112/1/10.1063/1.4733696
10.1063/1.4733696
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