Results 71 to 80 of about 7,683 (202)

Fiber MOPA based tunable source for terahertz spectroscopy [PDF]

Laser Physics Letters, 2011
We have developed a terahertz spectrometer based on difference frequency generation of beams from a fiber MOPA. We present some demonstration data on water vapor absorption lines.
Malinowski, A., Lin, Dejiao, Alam, S.U., Zhang, Z., Ibsen, M., Young, J., Wright, P., Ozanyan, K., Stringer, M., Miles, R.E., Richardson, D.J.   +10 more
openaire   +3 more sources

Two-dimensional multi-beam steering for parallel free-space optical communication based on a silicon nitride optical phase array

APL Photonics
We propose and demonstrate a broadband two-dimensional multi-beam optical phased array (MOPA) with four beams based on a Butler matrix on a silicon nitride (Si3N4) platform. A beamforming network utilizing cascaded Butler matrix splitting arrays has been
Wenke Jiao, Jingye Chen, Daixin Lian, Hongxuan Liu, Mingyu Zhu, Shi Zhao, Daoxin Dai, Yaocheng Shi   +7 more
doaj   +1 more source

Green-pumped, picosecond MgO:PPLN optical parametric oscillator

, 2011
We investigate the performance of a magnesium-oxide-doped periodically poled lithium niobate crystal (MgO:PPLN) in an optical parametric oscillator (OPO) synchronously-pumped by 530nm, 20ps, 230MHz pulses with an average power of up to 2W from a ...
Alam, Shaif-ul, Gawith, Corin B.E., Hung, Hazel, Kienle, Florian, Lin, Dejiao, Major, Huw, Richardson, David J., Shepherd, David P.   +7 more
core   +1 more source

Range Shift and Climatic Refugia for Alpine Lichens Under Climate Change

Diversity and Distributions, Volume 31, Issue 9, September 2025.
ABSTRACT Aim The mountain biodiversity is highly threatened by climate change, with many species facing habitat reduction and/or local extinction. Poikilohydric organisms like lichens are extremely sensitive to environmental conditions and changes. A comprehensive overview of the impact of climate change on the future distribution of lichens is still ...
Luana Francesconi, Michele Di Musciano, Matteo Conti, Luca Di Nuzzo, Gabriele Gheza, Martin Grube, Helmut Mayrhofer, Stefano Martellos, Pier Luigi Nimis, Chiara Pistocchi, Chiara Vallese, Juri Nascimbene   +11 more
wiley   +1 more source

High-energy, diode-pumped, nanosecond Yb:YAG MOPA system

Optics Express, 2008
Diode-pumped nanosecond multi-pass laser amplification to the joule level using an Yb:YAG slab crystal has been demonstrated. A maximum output pulse energy of 2.9 J at an optical-to-optical efficiency of 10% has been achieved. The seed pulses with a pulse duration of 6.4 ns were generated in a Q-switched Yb:YAG laser and amplified up to a pulse energy ...
Siebold, M., Hein, J., Wandt, C., Klingebiel, S., Krausz, F., Karsch, S.   +5 more
openaire   +3 more sources

Estimation and Removal of Residual Motion Artifact in Retrospectively Motion-Corrected fMRI Data: A Comparison of Intervolume and Intravolume Motion Using Gold Standard Simulated Motion Data

Aperture Neuro
Residual head motion artifact in motion-corrected resting-state (rs-) functional MRI (fMRI) and fMRI datasets reduces the temporal signal-to-noise ratio and leaves non-neuronal signal components in the data, which can induce false findings in these ...
Wanyong Shin, Paul Taylor, Mark J. Lowe
doaj   +1 more source

Ultrafast development of blue pigment for in situ laser digital coloration in the ceramic industry

Journal of the American Ceramic Society, Volume 108, Issue 9, September 2025.
Integrated digital ceramic printing system with coupled laser. Abstract This study presents a fast and simple method for digital ceramic coloration using inkjet printing, eliminating the need for traditional precalcined pigments. This innovative approach represents a breakthrough in ceramic decoration technology, and introduces a previously unexplored ...
Abderrahim Lahlahi‐Attalhaoui, Jaime González Cuadra, Samuel Porcar García, Santiago Luis Toca Valero, Diego Fraga Chiva, Germán F. de la Fuente, Juan Bautista Carda   +6 more
wiley   +1 more source

Acousto-optical coherence tomography with a digital holographic detection scheme [PDF]

, 2012
Acousto-optical coherence tomography (AOCT) consists in using random phase jumps on ultrasound and light to achieve a millimeter resolution when imaging thick scattering media. We combined this technique with heterodyne off-axis digital holography.
Benoit, Emilie, Bossy, Emmanuel, Farahi, Salma, Gross, Michel, Ramaz, François   +4 more
core   +5 more sources

ModE Regulates Alternative Nitrogenase Expression in the Methanogen Methanosarcina acetivorans

Molecular Microbiology, Volume 124, Issue 2, Page 105-114, August 2025.
During nitrogen fixation, the methanogen Methanosarcina acetivorans produces the alternative vanadium‐nitrogenase and iron‐nitrogenase only when molybdenum is unavailable to support the activity of molybdenum‐nitrogenase. Our work demonstrates that the expression of the alternative nitrogenases in M.
Melissa Chanderban, Daniel J. Lessner
wiley   +1 more source

The mission operations planning assistant [PDF]

The Mission Operations Planning Assistant (MOPA) is a knowledge-based system developed to support the planning and scheduling of instrument activities on the Upper Atmospheric Research Satellite (UARS). The MOPA system represents and maintains instrument
Schuetzle, James G.
core   +1 more source