We will develop high-temperature high-power mid-infrared (2-5 micron) diodes based on InAs/InGaSb/InAlSb type-II quantum wells. In pulse mode operation, we will investigate the pulse-to-pulse reproducibility with repetition rates > 50 KHz. Recently, we have demonstrated room-temperature optically… More

We propose to develop multi-color mid-infrared (IR) sources at 2.5 to 5 um based on InAs/InGaSb type-II quantum cascade (QC) structures. A compact mid-IR dual wavelength source could be extremely useful for the environmental gas and pollutant sensing, such as differential absorption lidar, where the… More

We propose to develop single-mode DFB lasers at 1.8 to 2.2 um based on InGaAsP materails at room temperature with a linewidth of 0.1 to 0l.2 MHz. MBE regrowth technology will be used for the grating. We will also study the device reliability. A compact mid-IR single mode laser could be extremely… More

Infrared photodetectors operating in the wavelength range of 3-20 mm and beyond are of great importance to a wide variety of ongoing and future NASA missions, as well as many commercial and military applications in infrared (IR) imaging and sensing. Hence, there is a constant pursuit of advances in… More

This proposal concerns the fabrication and delivery of the Quantum Cascade (QC) semiconductor laser as a coherent light source operating in the mid-infrared region of the optical spectrum. This laser is unique as a semiconductor laser in that it utilizes only one carrier type, electrons, from… More

70560 New mid-infrared laser sources, such as the Quantum Cascade (QC) laser, are necessary to develop advanced and inexpensive gas sensing systems to monitor industrial-related chemical processes, including combustion and pollution effluent. This project will develop QC lasers with… More

70559 New mid-infrared laser sources, such as the Quantum Cascade (QC) laser, are necessary to develop advanced and inexpensive gas sensing systems to monitor chemical processes, including combustion and pollution effluent, for national security applications. This project will develop… More

InAs/InGaSb type-II superlattices have advantages over HgCdTe for photodetectors requiring higher temperature and longer wavelength operation. The type-II QW photodiodes have comparable quantum efficiency, smaller dark current due to a larger effectivemass, much slower Auger recombination rates,… More

InAs/InGaSb type-II superlattices have advantages over HgCdTe for photodetectors requiring higher temperature and longer wavelength operation. The type-II QW photodiodes have comparable quantum efficiency, smaller dark current due to a larger effectivemass, much slower Auger recombination rates,… More

A compact mid-IR dual wavelength laser is highly' desirable for the environmental gas and pollutant sensing, such as differential absorption lidar, where the light scattering has to be evaluated and compared at two different wavelengths. In the phase-Iproject, we have demonstrated the first… More

A compact mid-IR dual wavelength laser is highly' desirable for the environmental gas and pollutant sensing, such as differential absorption lidar, where the light scattering has to be evaluated and compared at two different wavelengths. In the phase-Iproject, we have demonstrated the first… More