WA3.1 - HIGH POWER ALL-FIBER AMPLIFIERS AT AIR FORCE RESEARCH LABORATORY
WA3.2 - Multi-kW, Uncooled Densely Packed Fiber Array for Laser Beam Combining
- L. Beresnev (US) CCDC Army Research Laboratory
- A. Flores (US) Air Force Research Laboratory
- R. Holten (US) Air Force Research Laboratory
- A. Valenzuela (US) CCDC-Army Research Lab
- A. Taliaferro (US) Air Force Research Laboratory
- A. Schweinsberg (US) CCDC Army Research Laboratory
- K. Gurton (US) CCDC Army Research Laboratory
- D. Ligon (US) CCDC Army Research Laboratory
- C. Williamson (US) CCDC Army Research Laboratory
- S. Bilyk (US) CCDC Army Research Laboratory
Abstract
Abstract
The array of seven fiber collimators with transmission about 99.9% was tested with 1.99kW per one channel. Truncated radiation, ~6%, was disposed through output collimating lenses by re-directing Gaussian beam tails with interior holey micro-lenses. No cooling was necessary. Beam quality in far-field M2 ~1.2.WA3.3 - MEGAFILAMENTATION OF TERAWATT, LONG-WAVELENGTH INFRARED LASER PULSES IN AIR
- S. Tochitsky (US) University of California, Los Angeles
- E. Welch (US) University of California, Los Angeles
- M. Polyanskiy (US) Brookhaven National Laboratory
- I. Pogorelsky (US) Brookhaven National Laboratory
- P. Panagiotopoulos (US) University of Arizona, Tucson
- M. Kolesik (US) University of Arizona
- E. Wright (US) University of Arizona, Tucson
- S. Koch (US) University of Arizona, Tucson
- J. Moloney (US) University of Arizona, Tucson
- J. Pigeon (US) Stony Brook University, Physics and Astronomy
- C. Joshi (US) University of California, Los Angeles
Abstract
Abstract
A new regime of laser filamentation is demonstrated with terawatt, picosecond CO2 laser pulses forming a single centimeter diameter channel in air. Joules of pulse energy are self-guided at a clamped intensity of ~1012 W/cm2 due to generation of free carriers via many-body Coulomb effects.
WA3.4 - SINGLE SHOT AXIALLY RESOLVED FEMTOSECOND LASER FILAMENT PROFILES
Abstract
Abstract
An array of synchronized microphones measures energy deposition along the length of laser filament in a single shot. A spread of collapse location positions due to air turbulence and laser energy fluctuations causes a pronounced difference between single shot measurements and conventional multi-shot averaging.
WA3.5 - EXPERIMENTAL STUDY OF THE RESONANT ROVIBRATIONAL NONLINEARITY OF CO2 AND CO IN THE MID-IR
Abstract
Abstract
We present time- and frequency-resolved measurements of self-focusing and self-defocusing of 4.3-4.8 µm Fe:ZnSe laser pulses tuned near rovibrational transitions of CO2 And CO. We estimate the resonant nonlinearity of the air at 4.3 µm and discuss the novel nonlinear optics of simple molecules.