Dr. Douglas S. Baer Profile

Dr. Douglas S. Baer

President, Global Product Line Manager at ABB-Los Gatos Research Inc

SPIE Involvement:

Author

Publications (7)

Proceedings Article | 23 September 2002 Paper

Sensitive absorption measurements in the near-infrared region using off-axis integrated cavity output spectroscopy

Douglas Baer, Joshua Paul, Manish Gupta, Anthony O'Keefe

Proceedings Volume 4817, (2002) https://doi.org/10.1117/12.451461

KEYWORDS: Absorption, Carbon monoxide, Semiconductor lasers, Mirrors, Gas lasers, Spectroscopy, Temperature metrology, Optical resonators, Absorption spectroscopy, Near infrared spectroscopy

Read Abstract +

Proceedings Article | 30 November 1999 Paper

New room temperature CW InGaAsSb/AlGaAsSb QW ridge diode lasers and their application to CO measurements near 2.3 um

Mikhail Maiorov, Jian Wang, Douglas Baer, Hao Lee, Gregory Belenky, Ronald Hanson, John Connolly, Dmitri Garbuzov

Proceedings Volume 3855, (1999) https://doi.org/10.1117/12.371275

KEYWORDS: Quantum wells, Semiconductor lasers, Carbon monoxide, Gas lasers, Continuous wave operation, Absorption, Indium gallium arsenide antimonide, Temperature metrology, Combustion, Switching

Read Abstract +

In this work the spectral characteristics of a new type of mid-infrared diode laser are discussed and an application for CO trace gas detection is demonstrated. The InGaAsSb/AlGaAsSb QW diode lasers operating in the spectral range of 2.0 - 2.7 micrometer in continuous wave (CW) regime at room temperature (RT) were developed last year. Earlier, the spectral range of RT CW operation for diode lasers was limited by 2.0 - 2.1 micrometer. The extension of wavelength to 2.7 micrometer was achieved for InGaAsSb/AlGaAsSb quantum well (QW) lasers by employing for QWs new quasi-ternary InGaSb(As) compositions that are out of the miscibility gap for InGaAsSb materials. Single spatial mode ridge lasers emitting at 2.2 - 2.7 micrometer have parameters similar to those of the infrared lasers with (lambda) less than 2 micrometer widely used for spectroscopic application. At operating currents about 80 - 200 mA and temperatures up to +50 degrees Celsius, these lasers emit CW output power of several milliwatts. Investigation of the laser spectra has revealed the current and temperature ranges where a single longitudinal mode dominates with side mode suppression of 22 - 25 dB. The dominant mode can be tuned in wavelength by varying current or temperature. The lasers were used to record high-resolution CO absorption lineshapes (2v band near 2.3 micrometer) in a static cell (14.9-cm path). Probed CO transitions were selected for applications to in situ measurements in high- temperature combustion flows. In general, the measured CO absorption lineshapes agreed with theoretical Voigt profiles calculated using the HITRAN database to within 2%. For a minimum detectable absorbance of 0.01% and a 1-meter long path, the CO measurement sensitivity for the probed R30 transition near 2.302 micrometer was 5 - 10 ppm at 1000 K. This value is about two orders of magnitude better than the sensitivity reported for CO detection with conventional diode lasers that probe transitions in the 3v band near 1.56 micrometer.

Proceedings Article | 22 January 1999 Paper

Advanced diode-laser absorption sensors for combusion monitoring and control

Douglas Baer, Edward Furlong, Radu Mihalcea, Michael Webber, Ronald Hanson

Proceedings Volume 3535, (1999) https://doi.org/10.1117/12.337462

KEYWORDS: Temperature metrology, Combustion, Absorption, Sensors, Carbon monoxide, Control systems, Semiconductor lasers, Multiplexing, Gas lasers, Adaptive control

Read Abstract +

Proceedings Article | 21 November 1997 Paper

Diode laser sensor system for closed-loop control of a 50-kw incinerator

Edward Furlong, Radu Mihalcea, Michael Webber, Douglas Baer, Ronald Hanson, T. Parr

Proceedings Volume 3172, (1997) https://doi.org/10.1117/12.293398

KEYWORDS: Carbon monoxide, Temperature metrology, Absorption, Control systems, Semiconductor lasers, Sensors, Combustion, Multiplexing, Carbon dioxide, Gases

Read Abstract +

Proceedings Article | 21 November 1997 Paper

Diode laser absorption sensor system for measurements of combustion pollutants

Radu Mihalcea, Douglas Baer, Ronald Hanson

Proceedings Volume 3172, (1997) https://doi.org/10.1117/12.293387

KEYWORDS: Absorption, Carbon monoxide, Carbon dioxide, Combustion, Sensors, Temperature metrology, Gases, Semiconductor lasers, Spectroscopy, Absorption spectroscopy

Read Abstract +

Proceedings Article | 21 October 1996 Paper

Real-time process control using diode laser absorption sensors

Douglas Baer, E. Furlong, Ronald Hanson

Proceedings Volume 2834, (1996) https://doi.org/10.1117/12.255327

KEYWORDS: Temperature metrology, Control systems, Actuators, Semiconductor lasers, Sensors, Absorption, Multiplexing, Process control, Gases, Modulation

Read Abstract +

Proceedings Article | 8 April 1996 Paper

Combustion control using a multiplexed diode-laser sensor system

Douglas Baer, E. Furlong, Ronald Hanson

Proceedings Volume 2703, (1996) https://doi.org/10.1117/12.237729

KEYWORDS: Temperature metrology, Sensors, Control systems, Multiplexing, Semiconductor lasers, Absorption, Combustion, Absorbance, Fiber optics sensors, Gases

Read Abstract +

Showing 5 of 7 publications

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years