Zobrazeno 1 - 10
of 194
pro vyhledávání: '"Vainio, Markku"'
Autor:
Larnimaa, Santeri, Vainio, Markku
We propose a new Fourier-transform spectroscopy technique based on the rotational Doppler effect. The technique offers an application for optical vortex frequency combs, where each frequency component carries a unique amount of orbital angular moment
Externí odkaz:
http://arxiv.org/abs/2405.09313
We demonstrate a simple system for dual-comb spectroscopy based on two inherently coherent optical frequency combs generated via seeded parametric down-conversion. The inbuilt coherence is established by making the two combs share a common comb line.
Externí odkaz:
http://arxiv.org/abs/2405.03182
We demonstrate a 13-fold speed improvement in broadband cantilever-enhanced photoacoustic spectroscopy (CEPAS) by combining it with phase-controlled Fourier-transform spectroscopy (PC-FTS) instead of traditional Fourier-transform infrared spectroscop
Externí odkaz:
http://arxiv.org/abs/2212.10084
Autor:
Roiz, Mikhail, Vainio, Markku
This study proposes and demonstrates a versatile method for near and mid-infrared optical frequency comb generation using multi-seeded femtosecond optical parametric generation. The method allows one to divide the repetition rate by an arbitrarily la
Externí odkaz:
http://arxiv.org/abs/2202.13383
We present the first report of optical absorption spectroscopy of H$^{36}\!$Cl, a radioactive isotopologue of hydrogen chloride. We used Fourier-transform infrared spectroscopy to determine the line center wavenumbers of the fundamental rovibrational
Externí odkaz:
http://arxiv.org/abs/2108.13031
Photoacoustic detection is a sensitive method for measurement of light-absorbing particles directly in the aerosol phase. In this article, we demonstrate a new sensitive technique for photoacoustic aerosol absorption measurements using a cantilever m
Externí odkaz:
http://arxiv.org/abs/2106.12389
A high-sensitivity LED based photoacoustic NO$_2$ sensor is demonstrated. Sensitive photoacoustic gas sensors based on incoherent light sources are typically limited by background noise and drifts due to a strong signal generated by light absorbed at
Externí odkaz:
http://arxiv.org/abs/2104.11328
Autor:
Rossi, Jussi, Uotila, Juho, Sharma, Sucheta, Hieta, Tuomas, Laurila, Toni, Teissier, Roland, Baranov, Alexei, Ikonen, Erkki, Vainio, Markku
Optical power measurements are needed in practically all technologies based on light. Here we report a general-purpose optical power detector based on the photoacoustic effect. Optical power incident on the detector's black absorber produces an acous
Externí odkaz:
http://arxiv.org/abs/2104.06930
We demonstrate efficient generation of mid-infrared frequency combs based on continuous-wave-seeded femtosecond optical parametric generation in nonlinear waveguides. Conversion of the near-infrared pump to signal and idler light takes place with ver
Externí odkaz:
http://arxiv.org/abs/2104.05318