We demonstrate non-contact remote photoacoustic spectroscopy in the mid-infrared region. A room-temperature-operated pulsed external-cavity quantum cascade laser is used to excite photoacoustic waves within a semitransparent sample. The ultrasonic waves are detected remotely on the opposite side of the sample using a fiber-optic Mach-Zehnder interferometer, thereby avoiding problems associated ...

We present a study on THz generation in lithium niobate pumped by a powerful and versatile Yb:CaF(2) laser. The unique laser system delivers transform-limited pulses of variable duration (0.38-0.65 ps) with pulse energies up to 15 mJ and center wavelength of 1030 nm. From previous theoretical investigations, it is expected that such laser parameters are ideally suited for efficient THz generati...

Materials and methods Over 2000 students at random in four major universities in Minsk, Belarus were explained the study objectives. Approximately 75% of students in these universities are females. Only those who agreed to participate were considered for the study. A total of 465 males (mean age 21 yrs) and 1030 females (mean age 20.5 yrs) were administered anonymous AUDIT questionnaire and oth...

We report on a high-power narrow-linewidth pulsed laser source emitting at a wavelength of 257 nm. The system is based on a master oscillator power amplifier architecture, with Yb-doped fiber preamplifiers, a Yb:YAG single crystal fiber power amplifier used to overcome the Brillouin limitation in glass fiber and nonlinear frequency conversion stages. This particularly versatile architecture all...

31 Jackman S, Brereton RJ, Wright VM. Results of surgical treatment of neonatal necrotizing enterocolitis. BrJ Surg 1990, 77: 146-8. 32 Smith SD, Tagge EP, Miller J, Cheu H, Sukarochana K, Rowe MI. The hidden mortality in surgically treated necrotizing enterocolitis: fungal sepsis. J Pediatr Surg 1990; 25: 1030-3. 33 Cikrit D, Mastandrea J, West KW, Schreiner RL, Grosfeld JL. Necrotizing entero...

We demonstrate that nonlinear fiber compression is possible at unprecedented average power levels by use of a large-mode-area holey (microstructured) fiber and a passively mode-locked thin disk Yb:YAG laser operating at 1030 nm. We broaden the optical spectrum of the 810-fs pump pulses by nonlinear propagation in the fiber and remove the resultant chirp with a dispersive prism pair to achieve 1...

A ytterbium-doped, glass, channel waveguide laser, fabricated by ion exchange, is reported. The 2.2-cm long device, using broad-band 4% output couplers, lased in the vicinity from 1020 to 1030 nm when pumped by a Ti : sapphire laser operating at 910 nm. A lasing threshold of 50 mW (launched pump) and a slope efficiency of 5% were measured. Device parameters, including fluorescence lifetimes, em...

Cytoskeleton Dynamics Group, Signalling and Motility Group, Helmholtz Centre for Infection Research, Inhoffen Straße 7, D-38124 Braunschweig, Germany; IFOM Foundation, The FIRC Institute for Molecular Oncology, Via Adamello 16, 20139 Milan, Italy; Institute of Molecular Biotechnology, Austrian Academy of Sciences, Dr. Bohr Gasse 3, A-1030 Vienna, Austria; Institute for Biophysical Chemistry, Ha...

31 Jackman S, Brereton RJ, Wright VM. Results of surgical treatment of neonatal necrotizing enterocolitis. BrJ Surg 1990, 77: 146-8. 32 Smith SD, Tagge EP, Miller J, Cheu H, Sukarochana K, Rowe MI. The hidden mortality in surgically treated necrotizing enterocolitis: fungal sepsis. J Pediatr Surg 1990; 25: 1030-3. 33 Cikrit D, Mastandrea J, West KW, Schreiner RL, Grosfeld JL. Necrotizing entero...

Mode locking based on an epitaxial composite of the monoclinic double tungstate crystal Yb:KLu(WO4)2 is realized. A 100 microm thin Yb:KLu(WO4)2 layer grown on a KLu(WO4)2 substrate is used as an active medium in a laser passively mode locked by a semiconductor saturable absorber. Pulse durations of 114 fs have been achieved for an average power of 31 mW at 1030 nm. Results in the femtosecond a...