Zobrazeno 1 - 10
of 28
pro vyhledávání: '"Thomas G. Alley"'
Autor:
Thomas G. Alley, Brian Krause, Philip Gatt, Samuel T. Thurman, Andrew Bratcher, Kalle Anderson
Publikováno v:
Imaging and Applied Optics 2019 (COSI, IS, MATH, pcAOP).
Publikováno v:
SPIE Proceedings.
We report on digital holographic imaging through atmospheric turbulence. Data recorded with aberrations is corrected during post processing using an iterative sharpness-metric maximization algorithm. Assuming the correction cancels the actual wavefro
Publikováno v:
Journal of Applied Physics. 86:6634-6640
Applying a dc electric field across a fused silica sample at elevated temperatures followed by cooling the sample with the field applied (thermal poling) leads to a second-order nonlinearity that has been linked to the formation of a space-charge reg
Publikováno v:
Journal of Non-Crystalline Solids. 242:165-176
Measurements of the transient behavior of both the second-harmonic generation signal and the poling current for type-II fused silica samples under a variety of poling histories are reported. The applied voltage was switched between +5 kV, 0 V, and
Autor:
Angel Flores, Andrew Bratcher, Anthony D. Sanchez, Benjamin Pulford, Thomas G. Alley, Radoslaw Uberna
Publikováno v:
Optics express. 18(13)
Four actively phase-locked beams produced by fiber amplifiers in a master oscillator power amplifier (MOPA) configuration were coherently combined in a glass capillary re-imaging waveguide producing more than 100 W of coherent output with 80% combini
Publikováno v:
Optics express. 15(2)
We report using a Raman fiber laser (RFL) based on a multimode graded-index fiber as a novel method for beam combination of two continuous wave pump beams. Due to stimulated Raman scattering, the RFL generates a Stokes beam which can be up to 300% br
Publikováno v:
Optics express. 14(24)
We demonstrated the successful combination and cleanup of four laser beams via stimulated Raman scattering (SRS) using a multi-port fiber combiner and a large multimode fiber. Multiple Stokes orders were observed in the output, but loss at longer wav
Autor:
Steven R. J. Brueck, Thomas G. Alley
Publikováno v:
Optics letters. 23(15)
We etched thermally poled fused-silica coverslips in 49% HF for 30 s transverse to the poling direction to reveal structural details of the nonlinear region. A peaked ridge below the anode surface, corresponding to a slower etch rate than that of the
Publikováno v:
Optics letters. 32(9)
We demonstrate passive combination of multiple beams in an optical fiber via stimulated Brillouin scattering (SBS). Four off-axis beams are combined in a long multimode optical fiber using a novel all-optical mount. The combined beam has the high spa
Publikováno v:
Fiber Lasers IV: Technology, Systems, and Applications.
We report on the performance of seeded Raman fiber amplifiers based on multimode gradient index fiber. The "beam cleanup" improvement in beam quality of the Stokes beam over that of input pump beam (previously observed in unseeded fiber amplifier geo