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Quantification of Different Water Species in Acetone using a NIR-Triple-Wavelength Fiber Laser
(2016-02-25)
A fiber laser using a thulium-doped ZBLAN gain medium was used to generate laser radiation simultaneously at 1461, 1505 and 1874 nm, with > 5 mW output power at each of the wavelengths. The laser was used to quantify the ...
Fluorescence Excitation–Emission Matrix (EEM) Spectroscopy and Cavity Ring-Down (CRD) Absorption Spectroscopy of Oil-Contaminated Jet Fuel Using Fiber-Optic Probes
(2016-03-11)
Excitation emission matrix (EEM) and cavity ring-down (CRD) spectral signatures have been used to detect and quantitatively assess contamination of jet fuels with aero-turbine lubricating oil. The EEM spectrometer has been ...
Photoelectron Imaging Following 2 þ 1 Multiphoton Excitation of HBr
(2016-03-29)
The photodissociation and photoionization dynamics of HBr via low-n Rydberg and ion-pair states was studied by using 2 + 1 REMPI spectroscopy and velocity map imaging of photoelectrons. Two-photon excitation at about 9.4–10 ...
Instantaneous photoinduced patterning of an azopolymer colloidal nanosphere assembly
(OSA, 2016-09-01)
Colloidal azopolymer nanospheres assembled on a glass substrate were exposed to a single collimated laser beam. The combination of photo-fluidic elongation of the spherical colloids and light induced self-organization of ...
Measurements of Energy Partitioning in H2 Formation by Photolysis of Amorphous Water Ice
(2016-03-21)
We demonstrate experimentally that photodissociation of amorphous solid water at 100 K results in formation of H2 molecules with an ortho/para ratio of gOPR = 3. Two distinct mechanisms can be identified: endothermic ...
Visual Observation of Redistribution and Dissolution of Palladium During the Suzuki–Miyaura Reaction
(2016-03-21)
Now you see it, now you don't: A specially designed reactor that heats only a small area of Pd foil during a Suzuki-Miyaura coupling permits observation of the surface changes during the reaction. Dissolution of Pd occurs ...
Refractive Index Sensor Based On An Abrupt Taper Michelson Interferometer In a Single-Mode Fiber
(2016-03-21)
A simple refractive index sensor based on a Michelson interferometer in a single-mode fiber is constructed and demonstrated. The sensor consists of a single symmetrically abrupt taper region in a short piece of single-mode ...
Direct Sensing in Liquids Using Whispering-Gallery-Mode Droplet Resonators
(2016-03-03)
Liquid droplets suspended by the tip of a thin wire, a glass capillary, or a needle form high-Q optical resonators, thanks to surface tension. Under gravity equilibrium conditions, the maximum drop diameter is approximately ...
Fiber-Optic Ring-Down Spectroscopy Using a Tunable Picosecond Gain-Switched Diode Laser
(2016-03-23)
Visible and near-infrared laser light pulses were
coupled into two different types of optical fiber cavities. One
cavity consisted of a short strand of fiber waveguide that contained
two identical fiber Bragg gratings. ...
State-Selective Photodissociation Dynamics of Formaldehyde: Near Threshold Studies of the H+HCO Product Channel
(2016-03-22)
The laser-induced photodissociation of formaldehyde in the wavelength range 309<λ<330nm
309<λ<330nm
has been investigated using H (Rydberg) atom photofragment translational spectroscopy. Photolysis wavelengths corresponding ...