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Widely tunable single-mode quantum cascade laser source for mid-infrared spectroscopy
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Schematic of the widely tunable quantum cascade laser source with a distributed feedback laser array driven by a custom microelectronic controller. The dotted line denotes the routing of the current pulse and the DC bias to a specific laser (second from top) to fire it at a specified wavelength. (b) The processed laser array chip placed on top of a dime for size comparison. Squares on the bottom portion of the chip are gold pads for wire bonding.

Image of FIG. 2.
FIG. 2.

(a) Spectra of 32 single-mode distributed feedback lasers in the array. Laser frequencies are spaced apart and span a range of . (Inset) Spectrum of a representative laser in the array on a log scale, showing side-mode suppression . (b) Plot of the voltage (left axis) and light output (right axis) characteristics of several representative lasers in the array as functions of current. (c) Temperature tuning of the emission frequency of a laser in the array by heating it from in 15° increments (traces arranged top to bottom, respectively).

Image of FIG. 3.
FIG. 3.

Absorption spectra of isopropanol (squares), methanol (triangles), and acetone (circles) obtained with the laser array and with a Bruker Vertex 80v Fourier transform infrared spectrometer (continuous lines). (Inset) Experimental setup for mid-infrared spectroscopy of liquids with the quantum cascade laser source.


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Scitation: Widely tunable single-mode quantum cascade laser source for mid-infrared spectroscopy