Recent results from broadly tunable external cavity quantum cascade lasers

Caffey, David; Radunsky, Michael B.; Cook, Vince; Weida, Miles J.; Buerki, Peter R.; Crivello, Sam; Day, Timothy

doi:10.1117/12.875093

Cited by 18 publications

(10 citation statements)

References 17 publications

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“…Alternatively, a wider spectral coverage can be achieved by broadening the bandwidth of the active region and utilizing an external cavity (EC) to promote lasing at a particular wavelength [58]. The most effective means of expanding the bandwidth is to design the stack so that one or both levels in the lasing transition are replaced by a continuum of states.…”

Section: Quantum and Interband Cascade Lasersmentioning

confidence: 99%

Emerging Infrared Laser Absorption Spectroscopic Techniques for Gas Analysis

Tittel

Lewicki

Lascola

et al. 2013

Trace Analysis of Specialty and Electronic Gases

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Section: Quantum and Interband Cascade Lasersmentioning

confidence: 99%

Emerging Infrared Laser Absorption Spectroscopic Techniques for Gas Analysis

Tittel

Lewicki

Lascola

et al. 2013

Trace Analysis of Specialty and Electronic Gases

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“…The invention of quantum cascade lasers (QCLs) has particularly enabled the detection of trace materials at distances of up to one hundred meters [ 14 ], as QCLs exhibit an increased output power of up to hundreds of milliwatts. Stable operation in a large spectrum of wavelengths, mode-hop-free tuning, and a narrow line width at various operating conditions are other factors that make QCLs interesting for detection of hazardous substances [ 15 , 16 , 17 ] and gas analysis [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Setup and Analysis of a Mid-Infrared Stand-Off System to Detect Traces of Explosives on Fabrics

Dreier

Kölbl

Jeuk

et al. 2022

Sensors

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The increasing number of terrorist attacks within the last decade has demonstrated that taking preventive protective measures is highly important. In addition to existing measures, automated detection systems for fast and reliable explosive detection are required. A sensitive spectroscopic system based on mid-infrared spectroscopy has been developed and applied to explosive samples on different types of fabric under various geometric conditions. Using this system, traces of TNT, RDX, PETN and ammonium nitrate can be detected in less than a second. Various approaches for data pretreatment (wavelength calibration) and subsequent analysis (normalization, removal of atmospheric water absorption lines) are presented and the remaining challenges on the road to a fully automated system, including a robust classification algorithm, are discussed.

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“…Recently, mid infrared (MIR) light sources beyond 4µm have drawn considerable interests for applications in many industrial and scientific applications, including medical diagnosis, gas sensing, atmosphere, defence, food security, environment monitoring, etc [1][2][3][4]. This is because their wavelength region has strong absorption strength of radiations, and covers the main atmospheric windows as well as many molecular gases, soil pollutants, toxic agents, water and breath components [5]. MIR wavelength range can be generated from several light sources such as optical parametric amplifiers [6], quantum cascade laser [7], supercontinuum [8] and a fiber laser [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Designing a W-type index praseodymium-doped chalcogenide fiber for strongly-efficient MIR Laser beyond 4 μm

Khamis

QaisAlAbbasi

2022

Int. j. electr. comput. eng. syst. (Online)

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This study is to propose an efficient design based on W-type index praseodymium (Pr 3+ )-doped chalcogenide fiber to enhance the emission of mid-infrared (MIR) wavelength beyond 4 μm. The advantage of the proposed design is to enlarge the core diameter to 32 μm under single mode guidance in order to restrict any impacts of nonlinearity and enhance the applied pumping power before the damage threshold. The effective mode field areas are about 979 μm 2 and 812 μm 2 at 4.5μm emitted MIR wavelength and 2.04μm pump wavelength, respectively. In the considered laser layout within this paper, a single pair of Fiber Bragg Gratings FBGs lay is adopted in the overlapping area of the emitting cross-sections parts of Pr 3+ ions in the transitions ( 3 F 2 , 3 H 6 → 3 H 5 and 3 H 5 → 3 H 4 ). This selected laser layout avoids the difficulties in the fabrication of concatenated FBGs in Pr 3+ -doped chalcogenide glass fibers. In addition, the efficiency of the laser can be also enhanced at this laser layout by emitting two photons in MIR wavelengths from one excited ion. The simulation outcomes indicate the possibility to exceed 61% of slope efficiency at 4.5 μm for 1dB/m loss in the fiber.

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Recent results from broadly tunable external cavity quantum cascade lasers

Cited by 18 publications

References 17 publications

Emerging Infrared Laser Absorption Spectroscopic Techniques for Gas Analysis

Emerging Infrared Laser Absorption Spectroscopic Techniques for Gas Analysis

Setup and Analysis of a Mid-Infrared Stand-Off System to Detect Traces of Explosives on Fabrics

Designing a W-type index praseodymium-doped chalcogenide fiber for strongly-efficient MIR Laser beyond 4 μm

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