Zobrazeno 1 - 10
of 98
pro vyhledávání: '"J. H. Jacob"'
Publikováno v:
High-Power Diode Laser Technology XVI.
In the most developed fiber amplifiers, optical pump power is introduced into the ~400μm-diameter, 0.46NA first cladding of the double-clad, Yb-doped, gain fiber, using a (6+1):1 multi-mode fiber combiner. For this configuration, the core diameter a
Autor:
Jens Wiltfang, J. H. Jacob, Stefan Bleich, Robert Meyrer, Siegfried Lehrl, K. Gerstmeyer, Andreas W. Henkel, Helge Frieling, Johannes Kornhuber
Publikováno v:
Journal of Neural Transmission. 114:457-460
A newly discovered system of photoreceptors for circadian rhythms works non-visual and responds to blue light (460 nm). We report a longitudinal study in 44 adults, showing that a significant increase in alertness and speed of information processing
Publikováno v:
High-Power Diode Laser Technology and Applications XIII.
Copper-based micro-channel coolers (Cu-MCC) are the lowest thermal-resistance heat-sinks for high-power laserdiode (LD) bars. Presently, the resistivity, pH and oxygen content of the de-ionized water coolant, must be actively controlled to minimize c
Publikováno v:
Optics Express. 25:17695
We present a fiber-coupled pump-module emitting more than 1kW of mode-stripped power at 976nm from a detachable 225µm, 0.22NA fiber. The electrical-to-optical efficiency at 1kW is ~50%. Six of these pump modules attached to a (6 + 1):1 multimode com
Publikováno v:
2012 IEEE Photonics Society Summer Topical Meeting Series.
Current dependent absorption in broad area edge emitting lasers has been measured using laser diodes with high reflectivity (HR) output facets.
Publikováno v:
SPIE Proceedings.
A record, 940W, CW output-power has been achieved for a single, 1cm-wide, 5mm cavity-length, 77% fill-factor, 940nm, laser-diode bar operated at 900A and 20°C heat-sink temperature. The slope efficiency below 400A is 1.2W/A and the peak power-conver
Autor:
J H Jacob, A. Riviere, Xavier Castellsagué, Y. Etienne, M Crespi, A.M. Mandard, G Lebigot, S L Qiu, Nubia Muñoz, J. Marnay
Publikováno v:
European Journal of Cancer Prevention. 2:53-60
The prevalence of precancerous lesions of the oesophagus and their association with alcohol drinking, tobacco smoking and some dietary factors were examined in an endoscopic survey carried out in Lower Normandy, France, a high-risk area for oesophage
Autor:
S. D. Swartz, M. T. Knapczyk, R. Petr, A. M. Flusberg, I. Smilanski, Aland K. Chin, J. H. Jacob, M. A. Jaspan
Publikováno v:
SPIE Proceedings.
Detailed reliability studies of high-power, CW, broad-area, GaAs-based laser- diodes were performed. Optical and electrical transients occurring prior to device failure by catastrophic optical-damage (COD) were observed. These transients were correla
Autor:
M. A. Jaspan, R. Petr, Aland K. Chin, M. T. Knapczyk, R. K. Bertaska, J. H. Jacob, S. D. Swartz, A. M. Flusberg, I. Smilanski
Publikováno v:
SPIE Proceedings.
The present model of formation and propagation of catastrophic optical-damage (COD), a random failure-mode in laser diodes, was formulated in 1974 and has remained substantially unchanged. We extend the model of COD phenomena, based on analytical stu
Autor:
A, Andrieux, O, Switsers, M H, Chajari, J H, Jacob, T, Delozier, R, Gervais, N, Allouache, V, Laurençon, M, Henry-Amar, S, Bardet
Publikováno v:
The quarterly journal of nuclear medicine and molecular imaging : official publication of the Italian Association of Nuclear Medicine (AIMN) [and] the International Association of Radiopharmacology (IAR), [and] Section of the Society of.... 50(1)
Positron emission tomography (PET) using fluorine-18 fluorodeoxyglucose (FDG) can be performed using a dedicated PET scanner (PET-I) or a dual-head coincidence gamma camera (CGC-I). The aim of this study was to comparatively assess the impact of PET-