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Pulsed high duty cycle operation of λ ˜ 8μm quantum cascade lasers
2007 Edition, May 1, 2007 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We report on high duty-cycle pulsed and burst-mode operation of λ ˜ 8μm quantum cascade lasers under ambient conditions for photo-acoustic spectroscopy. An optimum in average optical power and efficiency is seen around...

Pulsed High Duty Cycle Operation of λ ~ 8μm Quantum Cascade Lasers
2007 Edition, May 1, 2007 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We report on high duty-cycle pulsed and burst-mode operation of lambda ~ 8 mum quantum cascade lasers under ambient conditions for photo-acoustic spectroscopy. An optimum in average optical power and efficiency is seen around 800 kHz...

Small optical feedback-induced noise of 6.1-μm quantum cascade lasers
2011 Edition, August 1, 2011 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

Relative intensity noise of a quantum cascade laser under optical feedback was first evaluated. Noise smaller than that of a conventional laser diode was due to a small line enhancement factor and long cavity length.

Room-temperature operation of index-coupled distributed-feedback 4.75 μm quantum cascade lasers fabricated without epitaxial regrowth
2013 Edition, June 1, 2013 - Optical Society (The) (OSA)

We demonstrate single-mode distributed-feedback quantum cascade lasers at 4.75 μm with etched index-coupled surface gratings and spin-on dielectric infilling. We observe continuous wave laser emission at room temperature with 5 W of electrical power consumption.

Long-wavelength (λ ≈ 14 μm) Quantum Cascade lasers with low threshold and high characteristic temperature (∼ 300 K)
2011 Edition, May 1, 2011 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We demonstrate a high-performance Quantum Cascade laser at ∼ 14 μm wavelength. It shows a low threshold current density of 2.1 kA/cm2 at 300 K and high characteristic temperature of 309 K around room temperature.

Photothermal detection of NO molecules using a 5.2 μm quantum cascade laser and a simple fiber-based interferometer
2017 Edition, June 1, 2017 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We present a first demonstration of photo-thermal detection of NO gas particles in a configuration using a 5.2 μm QCL as an excitation source and a simple fiber interferometer for probing the induced refractive index changes. The photo-thermal approach to laser gas spectroscopy...

Design and optimization of a GaAs-based sub-7-μm quantum cascade laser based on multivalley monte carlo simulation
2007 Edition, September 1, 2007 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We present the design and optimization of a deep-well GaAs-based quantum cascade laser (QCL) emitting at 6.7 μm, the shortest wavelength in GaAs-based QCLs, using a multivalley Monte Carlo simulation. The simulation is performed self-consistently with the design process....

High-power long-wavelength (/spl lambda//spl sim/11.5 μm) quantum cascade lasers operating above room temperature
1998 Edition, Volume 10, August 1, 1998 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

High-temperature operation (T=320 K) of quantum cascade lasers has been extended to 11.5-μm wavelengths with high performances. Peak-pulsed optical power of 55 mW is obtained at 300 K with a high T0=172 K, in good agreement with...

Room temperature, CW operation of 5.2 μm quantum cascade lasers with simple ridge structures, grown by MOVPE
2008 Edition, May 1, 2008 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We demonstrate room temperature, CW operation of a 5.2 mum quantum-cascade laser with single phonon resonance-continuum depopulation structure, grown by MOVPE. The laser exhibits a simple ridge structure without high reflection coatings.

Isotopic Ratio Measurements of Atmospheric Carbon Dioxide Using a 4.3 μm Pulsed Quantum Cascade Laser
2007 Edition, May 1, 2007 - IEEE - Institute of Electrical and Electronics Engineers, Inc.

We report CO2 isotopic ratios (13C, 18O) measured in air using a pulsed quantum cascade laser at 2310 cm-1. Performance is improved by analyzing the deviations between the sample spectra and simultaneously acquired reference spectra.

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