-
[show abstract]
[hide abstract]
ABSTRACT: Lasing properties of room temperature, continuous wave operated distributed feedback (DFB) quantum cascade lasers are reported. A bound-to-continuum active region was used to generate a broad gain spectrum. As a result, first-order DFB lasers employing different periods allowed us to achieve single mode continuous wave emission at several wavelengths ranging from 7.7 to 8.3 μ m at a temperature of +30 ° C . The frequency span corresponds to 8% of the center frequency.
Applied Physics Letters 11/2006; · 3.84 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We present a room temperature operated 5.35 μm quantum cascade detector which was tested at high frequencies using an optical heterodyne experiment. Two slightly detuned continuous wave distributed feedback single mode quantum cascade lasers were used to generate a beating signal. The maximum frequency at which the resulting microwave signal could be detected was 23 GHz. The cutoff behavior of our device was modeled with a simple RLC circuit and showed excellent agreement with the experimental data.
Applied Physics Letters 08/2006; 89(6):061119-061119-3. · 3.84 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We report on power, spectral linewidth, and mode purity for a cw 5.3 microm quantum cascade laser operated on a thermo-electric cooler. A totally noncryogenic nitric oxide monitor was constructed by integrating this laser with an astigmatic multipass cell and a thermo-electrically cooled infrared detector. The resulting instrument is capable of continuous unattended monitoring of ambient, atmospheric nitric oxide for several weeks with no operator intervention. The detection method was rapid sweep, direct absorption spectroscopy. A detection sensitivity of 0.03 parts in 10(9) is achieved with 30 s averaging time with a path length of 210 m, corresponding to an absorbance path length product of 1.5 x 10(-10) cm(-1).
Optics Letters 08/2006; 31(13):2012-4. · 3.40 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We report power, line width and mode purity for a cw 5.5 mum quantum cascade laser at -26 C. We detect atmospheric NO with high sensitivity (0.5 ppb Hz<sup>-1/2</sup>) using rapid sweep, direct absorption spectroscopy.
Lasers and Electro-Optics, 2006 and 2006 Quantum Electronics and Laser Science Conference. CLEO/QELS 2006. Conference on; 06/2006
-
[show abstract]
[hide abstract]
ABSTRACT: We demonstrate room-temperature, single-mode, continuous-wave operation of a λ ≃ 5.4 μm quantum-cascade laser up to the temperature of 30 °C. Processing is done using standard lithography in a ridge waveguide mounted junction-up. The active region is based on a bound-to-continuum transition. The high performances were achieved with a low active region doping and a thick electroplated gold deposition, resulting in a characteristic temperature of T0 = 155 K in continuous-wave with a threshold current density of jth = 2.05 kA/cm2 at 300 K.
Applied Physics Letters 01/2005; 86(4):041109-041109-3. · 3.84 Impact Factor
-
[show abstract]
[hide abstract]
ABSTRACT: We demonstrate room-temperature, single-mode, continuous-wave operation of a lambda~=5.4 mum quantum-cascade laser up to the temperature of 30 °C. Processing is done using standard lithography in a ridge waveguide mounted junction-up. The active region is based on a bound-to-continuum transition. The high performances were achieved with a low active region doping and a thick electroplated gold deposition, resulting in a characteristic temperature of T0=155 K in continuous-wave with a threshold current density of jth=2.05 kA/cm2 at 300 K.
Applied Physics Letters - APPL PHYS LETT. 01/2005; 86.
-
[show abstract]
[hide abstract]
ABSTRACT: The quantum cascade laser is an unipolar semiconductor laser source emitting in the mid-infrared range between 3.5 and 25 μm. During the past ten years after their invention, this technology has
reached the level of maturity required for commercialization, and QC
lasers have thus become very attractive for a large number of
applications, including gas sensing, pollution detection, atmospheric chemistry, detection of compounds, non-invasive medical
diagnostics, free-space optical data transmission or even LIDAR. Most common requirements are single-mode operation on thermoelectric cooler, high power and/or continuous-wave. Nowadays several high-power single-mode QC lasers are available at Alpes Lasers in the range from 4.3 to 16.5 μm, with a side-mode suppression ratio larger than 30 dB. We present here a specific high-average power Fabry-Perot quantum cascade laser and a distributed-feedback quantum cascade laser operating near 8 μm.© (2004) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
01/2004;
