Search Results - "Karhu, Juho"

Cantilever-enhanced photoacoustic measurement of HTO in water vapor by Karhu, Juho, Nyman, Markus, Siitari-Kauppi, Marja, Hieta, Tuomas

“…A photoacoustic detection of tritiated water (HTO) is presented. The method uses cantilever-enhanced photoacoustic spectroscopy (CEPAS) to reach sub-ppb…”
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Simple method for mid-infrared optical frequency comb generation with dynamic offset frequency tuning by Roiz, Mikhail, Kumar, Krishna, Karhu, Juho, Vainio, Markku

“…We present a simple method for fully stabilized mid-infrared optical frequency comb generation based on single-pass femtosecond optical parametric generation…”
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Efficient carrier-envelope phase tunable mid-infrared frequency combs based on CW-seeded optical parametric generation by Roiz, Mikhail, Lai, Jui-Yu, Karhu, Juho, Vainio, Markku

“…We present an efficient method for generating frequency combs in the mid-infrared (MIR) spectral range in bulk lithium niobate crystals as well as in…”
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Fully stabilized mid-infrared frequency comb for high-precision molecular spectroscopy by Vainio, Markku, Karhu, Juho

“…A fully stabilized mid-infrared optical frequency comb spanning from 2.9 to 3.4 µm is described in this article. The comb is based on half-harmonic generation…”
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Enhancement of photoacoustic spectroscopy with sorption enrichment for ppt-level benzene detection by Karhu, Juho, Hieta, Tuomas

“…A real-time trace gas detector for benzene is demonstrated. The measurement system takes advantage of modest enrichment through short adsorption periods to…”
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Cantilever-enhanced photoacoustic measurement of light-absorbing aerosols by Karhu, Juho, Kuula, Joel, Virkkula, Aki, Timonen, Hilkka, Vainio, Markku, Hieta, Tuomas

“…Photoacoustic detection is a sensitive method for measurement of light-absorbing particles directly in the aerosol phase. In this article, we demonstrate a new…”
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Frequency comb assisted two-photon vibrational spectroscopy by Karhu, Juho, Vainio, Markku, Metsälä, Markus, Halonen, Lauri

“…We report a setup for high-resolution two-photon spectroscopy using a mid-infrared continuous wave optical parametric oscillator (CW-OPO) and a near-infrared…”
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Step-modulated decay cavity ring-down detection for double resonance spectroscopy by Karhu, Juho, Lehmann, Kevin, Vainio, Markku, Metsälä, Markus, Halonen, Lauri

“…A method of measuring double resonant two-photon signal and background from a single cavity ring-down decay is introduced. This is achieved by modulating the…”
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LED-Based Photoacoustic NO2 Sensor with a Sub-ppb Detection Limit by Karhu, Juho, Hieta, Tuomas, Manoocheri, Farshid, Vainio, Markku, Ikonen, Erkki

“…A high-sensitivity light-emitting diode (LED)-based photoacoustic NO2 sensor is demonstrated. Sensitive photoacoustic gas sensors based on incoherent light…”
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High-resolution analysis of the ν3 band of radiocarbon methane 14CH4 by Larnimaa, Santeri, Halonen, Lauri, Karhu, Juho, Tomberg, Teemu, Metsälä, Markus, Genoud, Guillaume, Hieta, Tuomas, Bell, Steven, Vainio, Markku

“…[Display omitted] We present the first high-resolution measurements and rotational analysis of the fundamental asymmetric stretching vibrational band ν3(F2) of…”
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LED-Based Photoacoustic NO 2 Sensor with a Sub-ppb Detection Limit by Karhu, Juho, Hieta, Tuomas, Manoocheri, Farshid, Vainio, Markku, Ikonen, Erkki

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Enhancement of photoacoustic spectroscopy with sorption enrichment for ppt-level benzene detection by Karhu, Juho, Hieta, Tuomas

“…A real time trace gas detector for benzene is demonstrated. The measurement system takes an advantage of modest enrichment through short adsorption periods to…”
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Detection Sensitivity of Dual-Comb Spectroscopy by Mikhail, Roiz, Larnimaa, Santeri, Karhu, Juho, Vainio, Markku

“…Dual-comb spectroscopy (DCS) is a powerful technique that can unleash the full potential of optical frequency combs (OFC). A lot of research is devoted to the…”
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Fully Stabilized Mid-Infrared Frequency Comb for High-Precision Molecular Spectroscopy by Vainio, Markku, Karhu, Juho

“…A fully stabilized mid-infrared optical frequency comb spanning from 2.9 to 3.4 um is described. The comb is based on half-harmonic generation in a femtosecond…”
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Fully-Stabilized Mid-Infrared Optical Frequency Comb with Dynamic Offset Frequency Tuning by Roiz, Mikhail, Kumar, Krishna, Karhu, Juho, Vainio, Markku

“…We demonstrate an approach for mid-infrared frequency comb generation based on femtosecond Optical Parametric Generation seeded by a continuous-wave laser. The…”
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LED based photoacoustic NO$_2$ sensor with sub-ppb detection limit by Karhu, Juho, Hieta, Tuomas, Manoocheri, Farshid, Vainio, Markku, Ikonen, Erkki

“…A high-sensitivity LED based photoacoustic NO$_2$ sensor is demonstrated. Sensitive photoacoustic gas sensors based on incoherent light sources are typically…”
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Simple method for mid-infrared optical frequency comb generation with dynamic offset frequency tuning by Roiz, Mikhail, Kumar, Krishna, Karhu, Juho, Vainio, Markku

“…We present a simple method for fully-stabilized mid-infrared optical frequency comb generation based on single-pass femtosecond optical parametric generation…”
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Cantilever-Enhanced Photoacoustic Detector for Black and Brown Carbon by Karhu, Juho, Kuula, Joel, Mikkonen, Tommi, Ward, Matthew, Virkkula, Aki, Ikonen, Erkki, Hieta, Tuomas, Timonen, Hilkka, Vainio, Markku

“…Black carbon (BC) is a light absorbing aerosol, with an important role in climate system as its strong light absorption contributes to warming of the…”
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Mid-infrared frequency comb with 25 pJ threshold via CW-seeded optical parametric generation in nonlinear waveguide by Roiz, Mikhail, Lai, Jui-Yu, Karhu, Juho, Vainio, Markku

“…We demonstrate efficient generation of mid-infrared frequency combs based on continuous-wave-seeded femtosecond optical parametric generation in nonlinear…”
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Cantilever-enhanced photoacoustic measurement of light-absorbing aerosols by Karhu, Juho, Kuula, Joel, Virkkula, Aki, Timonen, Hilkka, Vainio, Markku, Hieta, Tuomas

“…Photoacoustic detection is a sensitive method for measurement of light-absorbing particles directly in the aerosol phase. In this article, we demonstrate a new…”
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