Resonant optothermoacoustic detection: technique for measuring weak optical absorption by gases and micro-objects

Kosterev, Anatoliy A.; Doty, James H.

doi:10.1364/ol.35.003571

Cited by 23 publications

(25 citation statements)

References 9 publications

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“…Other QEPAS spectrophone confi gurations, such as off-beam QEPAS, are also possible (Liu et al ., 2009(Liu et al ., , 2010. Furthermore, two novel modifi cations of the QEPAS sensor architecture based on interferometric photoacoustic spectroscopy (K ö hring et al ., 2011) and resonant optothermoacoustic detection (Kosterev and Doty, 2010 ) were reported recently.…”

Section: Conventional and Quartz-enhanced Photoacoustic Spectroscopymentioning

confidence: 94%

Tunable mid-infrared laser absorption spectroscopy

Tittel

Lewicki

2013

Semiconductor Lasers

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Section: Conventional and Quartz-enhanced Photoacoustic Spectroscopymentioning

confidence: 94%

Tunable mid-infrared laser absorption spectroscopy

Tittel

Lewicki

2013

Semiconductor Lasers

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“…8 Radiation from a near-IR diode laser is coupled to a single mode fiber, and then focused between the prongs of the QTF with a waist size of ≈ 15μm. The position of the beam was controlled by moving the focusing optics with a computer controlled 3D translation stage (Newport ESP300 Motion Controller w/3D stage).…”

Section: Methodsmentioning

confidence: 99%

“…Recently it was shown that the same transducer that was used in QEPAS could be used as a mechanically resonant optothermal detector. 8 Resonant optothermoacoustic detection (ROTADE) occurs when the optically excited gas molecules impact the wall of the QTF and cause localized heating. The QTF deforms due to the localized heating and the piezo-electric quartz converts the deformation into an electrical signal.…”

Section: Introductionmentioning

confidence: 99%

Recent advances in resonant optothermalacoustic detection

Doty

Kosterev

Tittel

2011

Quantum Sensing and Nanophotonic Devices VIII

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Optothermal detection is a spectroscopic technique where the energy input into a gas or other media caused by absorption of optical radiation is measured directly by means of a thermal detector. 1-3 A fraction of the absorbed energy is transported to the thermal detector by heat conduction or molecular diffusion. In this work a conventional thermal sensor was replaced by a quartz tuning fork (QTF), and the optical power input into the gas was modulated at the QTF resonant frequency. We call this approach "resonant optothermoacoustic detection", or ROTADE. The same experimental setup can be used to conduct a closely related technique, quartz enhanced photoacoustic spectroscopy (QEPAS). 4 QEPAS relies on energy transfer from the initially excited molecular vibrational state to the translational degrees of freedom. In some cases this process is too slow to follow the modulation required for QEPAS. In other cases, the resonant energy transfer can result in vibrational excitation of nitrogen, which relaxes very slowly. ROTADE, on the other hand, detects the energy delivered by molecules even if this energy is still in the form of vibrational excitation. The molecules will then release their energy to the QTF upon collision with its surface. Experimental investigations of ROTADE and its comparison with QEPAS were performed in pure CO2 and 0.5% acetylene in N 2 using near-infrared diode lasers. A fiber collimator and a refocusing lens were used to focus the laser to a ≈15 μm diameter waist. Its position was scanned in the QTF plane using a 3D translation stage with computer-controlled actuators. Different QTFs were used to compare the effect of modulation frequency on the ROTADE signal.

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“…The resulting temperature variations are detected indirectly via the pyroelectric effect and the result is thermal expansion in the tuning fork [12]. Clearly, this mechanism depends on the surrounding air pressure.…”

Section: Principlementioning

confidence: 99%

Resonant optothermal detector for use as an optical power meter

Walker

2011

2011 IEEE International Conference on Signal Processing, Communications and Computing (ICSPCC)

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We present a method of optical power measurement which can be used to measure optical radiation over a large part of the optical spectrum without switching between different sensor types. Based on resonant optothermal detection using a miniature quartz tuning fork, we find that the use of this method has superior dynamic range in the measurement of optical power. With use of the pyroelectric effect, sensitivities are comparable to standard pyroelectric detectors and measurement of quasi-CW modulated optical signals is a simple task. An optical power meter which uses this method can be put to use as a compact and low cost device in a wide variety of applications.

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Resonant optothermoacoustic detection: technique for measuring weak optical absorption by gases and micro-objects

Cited by 23 publications

References 9 publications

Tunable mid-infrared laser absorption spectroscopy

Tunable mid-infrared laser absorption spectroscopy

Recent advances in resonant optothermalacoustic detection

Resonant optothermal detector for use as an optical power meter

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