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Mid-Infrared Laser Applications in Spectroscopy
The vast majority of gaseous chemical substances exhibit fundamental vibrational absorption bands in the mid-infrared spectral region (≈ 2–25 µm), and the absorption of light by these fundamental… Expand
Measurement of tissue optical properties by the use of oblique-incidence optical fiber reflectometry.
Fiber-optic-based oblique-incidence reflectometry is a simple and accurate method for measuring the absorption and reduced scattering coefficients mu(a) and mu?(s) of semi-infinite turbid media.… Expand
Applications of quartz tuning forks in spectroscopic gas sensing
A recently introduced approach to photoacoustic detection of trace gases utilizing a quartz tuning fork (TF) as a resonant acoustic transducer is described in detail. Advantages of the technique… Expand
Quartz-enhanced photoacoustic spectroscopy.
A new approach to detecting a weak photoacoustic signal in a gas medium is described. Instead of a gas-filled resonant acoustic cavity, the sound energy is accumulated in a high- Q crystal element.… Expand
Measurement of tissue optical properties by time-resolved detection of laser-induced transient stress.
We report on a technique utilizing time-resolved detection of laser-induced stress transients for the measurement of optical properties in turbid media specifically suitable for biological tissues.… Expand
QEPAS spectrophones: design, optimization, and performance
The impact of design parameters of a spectrophone for quartz-enhanced photoacoustic spectroscopy on its performance was investigated. The microresonator of spectrophone is optimized based on an… Expand
Chemical sensors based on quantum cascade lasers
There is an increasing need in many chemical sensing applications ranging from industrial process control to environmental science and medical diagnostics for fast, sensitive, and selective gas… Expand
Spectroscopic detection of biological NO with a quantum cascade laser
- L. Menzel, A. Kosterev, +8 authors W. Urban
- Physics, Medicine
- Applied physics. B, Lasers and optics
- 1 May 2001
Abstract.Two configurations of a continuous wave quantum cascade distributed feedback laser-based gas sensor for the detection of NO at a parts per billion (ppb) concentration level, typical of… Expand
Linewidth and tuning characteristics of terahertz quantum cascade lasers.
We have measured the spectral linewidths of three continuous-wave quantum cascade lasers operating at terahertz frequencies by heterodyning the free-running quantum cascade laser with two… Expand
Laser-based optoacoustic imaging in biological tissues
- A. Oraevsky, S. Jacques, R. Esenaliev, F. Tittel
- Materials Science, Engineering
- SPIE LASE
- 1 August 1994
A new technique based on time-resolved detection of laser-induced stress transients is proposed to visualize the distribution of absorbed laser fluence in turbid and layered biological tissues.