Evaluation of distributed Bragg reflector lasers for high-sensitivity near-infrared gas analysis

Larson, Anders P.; Sandstroem, Lars G.; Höjer, Svante; Ahlberg, Henrik; Broberg, B.

doi:10.1117/1.601132

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…Injection current tuning over 100 nm around 1.5 µm has been demonstrated (Rigole et al 1995). Devices have been recently applied to high-sensitivity NH 3 detection (Larson et al 1997) and in-situ measurements of CO, OH, and H 2 O in combustion gases . These tuning ranges are equivalent to external cavity devices and approach that of a conventional dye laser, thereby simplifying present multilaser sensor concepts by allowing comparable wavelength coverage with a single device.…”

Section: Emerging Diode Laser Sourcesmentioning

confidence: 99%

“…Here, the periodic index modulation is applied to sections at the rear (usually) of the laser and electrically isolated from the gain medium. High-power, fixed-wavelength lasers used for optical pumping are typically DBR structures, although multi-electrode lasers with separate gain and wavelength control are beginning to be applied to gas sensing (Larson et al 1997 and are expected to have a broad impact on diode laser sensors. Because the wavelength tuning range is no longer restricted by the threshold/damage limits of the gain medium, wide current tuning ranges are possible (Yamaguchi et al 1985).…”

Section: Room-temperature Diode Laser Sourcesmentioning

confidence: 99%

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Diode laser absorption sensors for gas-dynamic and combustion flows

Allen

1998

Meas. Sci. Technol.

498

194

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Recent advances in room-temperature, near-IR and visible diode laser sources for tele-communication, high-speed computer networks, and optical data storage applications are enabling a new generation of gas-dynamic and combustion-flow sensors based on laser absorption spectroscopy. In addition to conventional species concentration and density measurements, spectroscopic techniques for temperature, velocity, pressure and mass flux have been demonstrated in laboratory, industrial and technical flows. Combined with fibreoptic distribution networks and ultrasensitive detection strategies, compact and portable sensors are now appearing for a variety of applications. In many cases, the superior spectroscopic quality of the new laser sources compared with earlier cryogenic, mid-IR devices is allowing increased sensitivity of trace species measurements, high-precision spectroscopy of major gas constituents, and stable, autonomous measurement systems. The purpose of this article is to review recent progress in this field and suggest likely directions for future research and development. The various laser-source technologies are briefly reviewed as they relate to sensor applications. Basic theory for laser absorption measurements of gas-dynamic properties is reviewed and special detection strategies for the weak near-IR and visible absorption spectra are described. Typical sensor configurations are described and compared for various application scenarios, ranging from laboratory research to automated field and airborne packages. Recent applications of gas-dynamic sensors for air flows and fluxes of trace atmospheric species are presented. Applications of gas-dynamic and combustion sensors to research and development of high-speed flows aeropropulsion engines, and combustion emissions monitoring are presented in detail, along with emerging flow control systems based on these new sensors. Finally, technology in nonlinear frequency conversion, UV laser materials, room-temperature mid-IR materials and broadly tunable multisection devices is reviewed to suggest new sensor possibilities.

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Section: Emerging Diode Laser Sourcesmentioning

confidence: 99%

Section: Room-temperature Diode Laser Sourcesmentioning

confidence: 99%

Diode laser absorption sensors for gas-dynamic and combustion flows

Allen

1998

Meas. Sci. Technol.

498

194

View full text Add to dashboard Cite

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“…In a conventional DFB or DBR laser, a single-period Bragg grating provides wavelength feedback (or reflectivity) at a single frequency peak. The periodically-modulated Bragggrating produces a comb of reflectance peaks 13,14 . The coupler section consists of single-period Bragg-grating with a broad spectral transmission peak.…”

Section: Multi-section Diode Lasersmentioning

confidence: 99%

“…Recently published work using three or four section lasers suggests the mode hops can be eliminated with the proper simultaneous sweeping of the reflector and phase injection currents. 13,14 It is important to eliminate these mode hops and we are investigating alternative current control schemes to develop continuous tuning techniques. The mode hops generate large spikes at the BRD log output.…”

Section: Room-temperature Measurementsmentioning

confidence: 99%

In-situ, multi-species combustion sensor using a multi-section diode laser

Upschulte

Sonnenfroh

Allen

et al. 1998

36th AIAA Aerospace Sciences Meeting and Exhibit

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Preliminary results of a near-IR diode laser sensor for in-situ monitoring of combustor and engine exhaust species have been demonstrated. A new laser technology which achieved nearly 100 nm quasi-continuous tuning using only injection current control in a foursection Grating-Coupler, Sampled-Reflector (GCSR) laser was used to simultaneously detect CO and CO 2 in room-temperature gas mixtures. The GCSR laser was used to perform in-situ measurements of CO, H 2 O, and OH in the exhaust gases of a methane/air flame. An initial demonstration of two-line absorption thermometry based on vibrational transitions in OH was also completed.

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