39 citations · 71 across the 5 of their papers we have counts for
5 papers
High-resolution analysis of the band of radiocarbon methane
Santeri Larnimaa, Lauri Halonen, Juho Karhu +6
We present the first high-resolution measurements and rotational analysis of the fundamental asymmetric stretching vibrational band of radiocarbon methane. A spectrome…
Broadband photoacoustic spectroscopy of with a high-power mid-infrared optical frequency comb
Juho Karhu, Teemu Tomberg, Francisco Senna Vieira +7
We report a photoacoustic spectroscopy setup with a high-power mid-infrared frequency comb as the light source. The setup is used in broadband spectroscopy of radiocarbon methane.…
Sub-part-per-trillion level detection of hydrogen fluoride by cantilever-enhanced photo-acoustic spectroscopy
Teemu Tomberg, Markku Vainio, Tuomas Hieta +1
We present a highly sensitive hydrogen fluoride detector based on simple cantilever-enhanced photo-acoustic spectroscopy. A noise equivalent concentration of 5 parts-per-trillion w…
Double resonant absorption measurement of acetylene symmetric vibrational states probed with cavity ring down spectroscopy
J. Karhu, J. Nauta, M. Vainio +3
A novel mid-infrared/near-infrared double resonant absorption setup for studying infrared-inactive vibrational states is presented. A strong vibrational transition in the mid-infra…
Spectral characterization of a frequency comb based on cascaded quadratic nonlinearities inside an optical parametric oscillator
Ville Ulvila, C. R. Phillips, Lauri Halonen +1
We present an experimental study of optical frequency comb generation based on cascaded quadratic nonlinearities inside a continuous-wave-pumped optical parametric oscillator. We d…