Accurate index of refraction measurements have been performed in flux-grown KTiOPO4. These give good agreement between experiment and theory for angle phase matching Type II second harmonic generation at 1.064 μm. refractive-index data allowed us to calculate the propagation angles wavelengths interest other than μm such as 1.34 energy conversion efficiency up 59% this material has also demonstrated with higher efficiencies possible. Limits are discussed.

We report the first operation of an optical parametric oscillator in a chalcopyrite crystal, AgGaS2. Tuning from 1.4 to 4.0 μm is demonstrated for 1.06-μm Nd:yttrium aluminum garnet pumping. The potential tuning range extends 12-μm transparency limit crystal.

The first successful operation of a AgGaSe2 infrared parametric oscillator is reported. Continuous tuning ranges 1.6–1.7 μm, 6.7–6.9 and 2.65–9.02 μm were achieved using 1.34-μm neodymium 2.05-μm holmium pump lasers. Pulse energies exceeding 3 mJ, peak powers near 100 kW, conversion efficiencies 18% obtained. Operation the was possible well below 13–40 MW/cm2 surface damage threshold this nonlinear material.

A visible BaB2O4 optical parametric oscillator (OPO) pumped by a single-axial-mode 355-nm source has been demonstrated. An average output power of 140 mW with signal wave conversion efficiency 13% and an idler 11% for total 24% achieved. The continuously tuned from 412 nm to 2.55 μm limited the infrared transmission range crystal. Through injection seeding we obtained OPO operation corresponding linewidth less than 3 GHz.

Experimental results of the first BaB/sub 2/O/sub 4/ optical parametric oscillator (OPO) are presented. The pump source was second harmonic output a Q-switched TEM/sub 00/ mode Nd:YAG laser. OPO had 1 mJ energy with peak power 80 kW in tuning range from 0.94 to 1.22 mu m.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

AgGaSe2 crystals for nonlinear infrared applications are being grown reproducibly. Using high-quality, 2-cm-long crystals, 14% energy and 60% peak intensity conversion efficiency have been demonstrated second harmonic generation of the pulsed output a CO2 miniature transversely excited atmospheric laser.

This paper presents a novel approach to optimize multiple invocations of sparse matrix-vector multiplication (SpMV) kernel performed on the same matrix A and dense vector x, like Ax, <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> ⋯, xmlns:xlink="http://www.w3.org/1999/xlink">k</sup> their linear combinations such as Ax + x. Such computations are frequently used in scientific applications for solving equations multi-grid methods....

Multigrid algorithms are widely used to solve large-scale sparse linear systems, which is essential for many high-performance workloads. The symmetric Gauss-Seidel (SYMGS) method often responsible the performance bottleneck of MG. This paper presents new methods parallelize and enhance computation parallelization efficiency SYMGS MG on multi-core CPUs. Our solution employs a matrix splitting strategy revised formula decrease operations memory accesses in SYMGS. With this strategy, we can...

We have produced coherent radiation in the XUV region at 70.9 nm by frequency tripling fifth harmonic of Nd:YAG laser neon. BaB2O4 was used to generate 212.8 with an output pulse energy 20 mJ and a width 5 nsec. Subsequent neon gas generated 10 W peak power nm.

Surface-enhanced Raman scattering (SERS) detection requires dense hotspots and a uniform distribution of analytes to obtain stable signal with good repeatability. However, due the coffee-ring effect on hydrophilic substrate, difficulty droplet manipulation superhydrophobic few substrates can ensure that are evenly distributed. In this work, we develop method efficiently enrich plasmonic for SERS measurement concave dome array (SCDA). The SCDA is formed by spraying hydrophobic silica...

Multigrid preconditioned conjugate gradient (MGPCG) is commonly used in high-performance computing (HPC) workloads. However, MGPCG notoriously challenging to optimize since most of its computation kernels are memory-bounded with low arithmetic intensity and non-trivial communication patterns among parallel processes. This article presents new techniques improve the data locality reduce overhead by first merging multigrid (MG). We then develop an asynchronous neighboring algorithm...

We report the first successful operation of a AgGaSe2 infrared optical parametric oscillator (OPO). Tuning ranges 1.6–1.7 and 6.7–6.9-μm were demonstrated using 1.34-μm Nd:YAGpump laser. Continuous tuning between 3.3 5.6 μm was obtained 2.05-μm Ho;YLF pump Pump powers up to 5 times OPO threshold employed without damage crystal. Maximum output energies exceeded 0.8 mj (2 × 1016 photons)/pulse at 4.6 μm, corresponding peak power 25 kW conversion efficiency 14%. Peak 30 18 % 1.66 Nd:YAG pump....

To detect the biological reaction on vein is an important part of technique. In this paper, we present a description our work in recent years imaging detector system. Novel routes to achieving alternative high sensitive ability are presented. The classifications and characteristics system outlined firstly. Then, some optical design results presented compared detail. At last, optimization future possible research works explored. optics detection generally analyzed. first considers LED light...

The nonlinear infrared materials silver thiogallate (AgGaS2) and selenogallate (AgGaSe2) have recently been grown in large-size high-optical-quality crystals which allowed several significant demonstrations of frequency conversion. Both operated as tunable parametric oscillators.1,2 High efficiency second harmonic conversion 10.6-μm radiation has demonstrated room temperature AgGaSe2 using a low repetition rate pulsed CO2 laser pump.3 Recent preliminary results shown that bulk high average...

NASA has been deeply involved in the development of new LIDAR instruments to be used as atmospheric probes. One important application is for DIAL measurements water vapor and oxygen content at different altitudes. LaserGenics Corp. a tunable Ti:Al₂0₃ laser oscillator Langley Research Center. The primary goals our program are an with linewidth less than one picometer each three wavelengths, 724 nm , 760 940 greater 25 mJ output energy per pulse repetition rate 10 Hz. We...