Abstract
In this paper, we report a single-mode Fabry-Pérot long wave infrared quantum cascade lasers based on the double phonon resonance active region design. For room temperature CW operation, the wafer with 35 stages was processed into buried heterostructure lasers. For a 4 mm long and 13 μm wide laser with high-reflectivity (HR) coating on the rear facet, continuous wave output power of 43 mW at 288 K and 5 mW at 303 K is obtained with threshold current densities of 2.17 and 2.7 kA/cm2. The lasing wavelength is around 10.5 μm. Single mode emission was observed for this particular device over the whole investigated current and temperature range.
Highlights
In the last 20 years, quantum cascade lasers (QCLs) have received a great deal of attention because of their potential advantages for use in a wide range of areas, including infrared countermeasures, environmental monitoring, free-space optical communications, and optical gas sensing [1] [2] [3]
We report a single-mode Fabry-Pérot long wave infrared quantum cascade lasers based on the double phonon resonance active region design
The room temperature (RT) continuous wave (CW) operation of single mode LWIR QCL can be obtained by few groups, especially when the wavelength is longer than 10 μm
Summary
In the last 20 years, quantum cascade lasers (QCLs) have received a great deal of attention because of their potential advantages for use in a wide range of areas, including infrared countermeasures, environmental monitoring, free-space optical communications, and optical gas sensing [1] [2] [3]. Watt-level outputs at wavelengths in the middle-wave infrared (MWIR, λ = 3 - 5 μm) range have been obtained [5]. The room temperature continuous wave operation of LWIR QCL can be obtained by few groups [9] [10] [11]. The first room temperature continuous wave LWIR QCLs was demonstrated using a double phonon resonance structure by Mattias Beck [12]. The room temperature (RT) continuous wave (CW) operation of single mode LWIR QCL can be obtained by few groups, especially when the wavelength is longer than 10 μm. We present a single mode LWIR QCL with a continuous wave (CW) operating temperature up to 303 K. For a 4 mm long and 13 μm wide QCL with high-reflectivity (HR) coating on the rear facet, CW output power of 43 mW at 288 K and 5 mW at 303 K is obtained, at a lasing wavelength of ~10.5 μm
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