Abstract
An ultra-broadband distributed-feedback quantum cascade laser array was fabricated, using a heterogeneous cascade based on two bound-to-continuum designs centered at 8.4 and 9.6 mum. This array emitted in a range over 220 cm-1 near a 9-mu m wavelength, operated in pulsed mode at room temperature. The output power of the array varied between 100- and 1100-mW peak intensity.
Highlights
Q UANTUM cascade lasers (QCLs) are semiconductor lasers based on resonant tunneling and optical transitions between electronic levels within the conduction band of a multiquantum-well structure
Arrays of distributed-feedback (DFB)-QCLs can be made as single-mode sources covering a wide range of mid-infrared frequencies [6], [7], with potential applications in spectroscopy
An ultra-broadband laser was first demonstrated by [9], accomplished by using a heterogeneous cascade to support lasing over a broad range of frequencies. [5] employed a heterogenous cascade of two bound-to-continuum designs to achieve a gain spectrum with a record full-width at half-maximum (FWHM) of 350 cm
Summary
Q UANTUM cascade lasers (QCLs) are semiconductor lasers based on resonant tunneling and optical transitions between electronic levels within the conduction band of a multiquantum-well structure. Arrays of distributed-feedback (DFB)-QCLs can be made as single-mode sources covering a wide range of mid-infrared frequencies [6], [7], with potential applications in spectroscopy. [5] employed a heterogenous cascade of two bound-to-continuum designs (with individual gain maxima at 8.4 and 9.6 m) to achieve a gain spectrum with a record FWHM of 350 cm. An ultra-broadband laser was first demonstrated by [9], accomplished by using a heterogeneous cascade to support lasing over a broad range of frequencies. Using this “two-stack” bound-to-continuum QCL, [10] obtained a single-mode tuning range of 292 cm in an external-cavity (EC) setup. We will employ the same two-stack active region design to achieve an ultra-broadband DFB-QCL array
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