Combined VIS-IR spectrometer with vertical probe beam

2017 ◽  
Vol 88 (12) ◽  
pp. 123111
Author(s):  
V. Protopopov
Keyword(s):  
Probe Beam ◽  
Vertical Probe

Pump-Probe Measurements Using Silicon Nanocrystal Waveguides

2003 ◽  
Vol 770 ◽  
Author(s):  
Nathanael Smith ◽  
Max J. Lederer ◽  
Marek Samoc ◽  
Barry Luther-Davies ◽  
Robert G. Elliman
Keyword(s):  
Probe Beam ◽  
Time Resolution ◽  
Pump Beam ◽  
Silicon Nanocrystals ◽  
Continuous Wave ◽  
Optical Gain ◽  
Optical Pump ◽  
Time Resolved ◽  
Pump Probe ◽  
Probe Measurements

AbstractOptical pump-probe measurements were performed on planar slab waveguides containing silicon nanocrystals in an attempt to measure optical gain from photo-excited silicon nanocrystals. Two experiments were performed, one with a continuous-wave probe beam and a pulsed pump beam, giving a time resolution of approximately 25 ns, and the other with a pulsed pump and probe beam, giving a time resolution of approximately 10 ps. In both cases the intensity of the probe beam was found to be attenuated by the pump beam, with the attenuation increasing monotonically with increasing pump power. Time-resolved measurements using the first experimental arrangement showed that the probe signal recovered its initial intensity on a time scale of 45-70 μs, a value comparable to the exciton lifetime in Si nanocrystals. These data are shown to be consistent with an induced absorption process such as confined carrier absorption. No evidence for optical gain was observed.

A Comparison of FT-IR/PA and FT-IR/PBD Spectra of Powders

1986 ◽  
Vol 40 (5) ◽  
pp. 636-641 ◽  
Author(s):  
P. G. Varlashkin ◽  
M. J. D. Low ◽  
G. A. Parodi ◽  
C. Morterra
Keyword(s):  
Probe Beam ◽  
Beam Deflection ◽  
Signal To Noise ◽  
Absorption Bands ◽  
Ir Radiation ◽  
Laser Probe ◽  
Ft Ir ◽  
Better Than

FT-IR photoacoustic (PA) and also photothermal beam deflection (PBD) spectra were recorded with the same particulate samples (graphite, charcoal, aspirin, and silica) under the same conditions in order to compare the quality of the spectra obtainable with the two techniques. A PA cell fitted with windows for the PBD laser probe beam was used, and PA and PBD spectra of each sample were recorded at 8 cm−1 resolution at each of the four different interferometer scan velocities. Although the overall aspects of FT-IR/PA and FT-IR/PBD spectra are the same, the signal-to-noise ratios of PA spectra are appreciably better than those of PBD spectra because PBD detection is more prone to disturbance by vibration than is PA detection. Absorption bands appear at the same wavenumbers in PA and PBD spectra. However, the relative intensities of bands of PBD spectra depend on the absorptive properties of the powdered solids; with weak absorbers, some bands may not be detected at all. PAS can be used with all powders. PBDS is of little or no use for the examination of weakly absorbing powders unless they scatter IR radiation extensively.

A scattered-light-based system for the probe beam monitoring of laser ablation dynamic

2004 ◽  
Author(s):  
Hanriete P. de Souza ◽  
Egberto Munin ◽  
Leandro P. Alves ◽  
Marcela L. Redigolo ◽  
Marcos Tadeu T. Pacheco
Keyword(s):  
Laser Ablation ◽  
Probe Beam ◽  
Scattered Light ◽  
Beam Monitoring

Initial performance and characteristics of the PBX-M 80 kV neutral probe beam

2003 ◽  
Author(s):  
H.W. Kugel ◽  
G. Gammel ◽  
G. Grotz ◽  
R. Kaita ◽  
T. Kozub ◽  
...  
Keyword(s):  
Probe Beam

A Probe Beam Deflection Study of Ion Exchange at Poly(vinylferrocene) Films in Aqueous and Nonaqueous Electrolytes

Langmuir ◽  
2002 ◽  
Vol 18 (7) ◽  
pp. 2756-2764 ◽  
Author(s):  
C. Barbero ◽  
M. C. Miras ◽  
E. J. Calvo ◽  
R. Kötz ◽  
O. Haas
Keyword(s):  
Ion Exchange ◽  
Probe Beam ◽  
Beam Deflection ◽  
Nonaqueous Electrolytes

The Use of Reverse Mirage Spectroscopy to Determine the Absorption Coefficient of Liquid Methanol at CO2 Laser Wavelengths

1989 ◽  
Vol 43 (1) ◽  
pp. 148-153 ◽  
Author(s):  
Dane Bićanić ◽  
Siegfried Krüger ◽  
Paul Torfs ◽  
Bruno Bein ◽  
Frans Harren
Keyword(s):  
Absorption Coefficient ◽  
Co2 Laser ◽  
Probe Beam ◽  
Laser Emission ◽  
Wavelength Region ◽  
Experimental Setup ◽  
Absorption Coefficients ◽  
Experimental Conditions ◽  
Liquid Samples

An experimental setup for performance of reverse mirage spectroscopy at CO2 laser wavelengths on liquid samples having high values of absorption coefficients is described. One and the same liquid is used as both the absorbing and deflecting medium. The Rosencwaig-Gersho theory has been applied, and the choice of experimental conditions that would enable determination of absorption coefficient β from the magnitude of photothermal signals measured at two different probe beam distances (probing locations) is discussed. The usefulness of this technique (essentially not inhibited by the requirements imposed on the sample's thickness) is tested on methanol having absorption coefficients β close to 300 cm−1 in the wavelength region covered by CO2 laser emission.

Implementation of a high energy 4ω probe beam on the Omega laser

2004 ◽  
Vol 75 (10) ◽  
pp. 3906-3908 ◽  
Author(s):  
A. J. Mackinnon ◽  
S. Shiromizu ◽  
G. Antonini ◽  
J. Auerbach ◽  
K. Haney ◽  
...  
Keyword(s):  
Probe Beam ◽  
High Energy ◽  
Omega Laser

scholarly journals Refractive Index Seen by a Probe Beam Interacting with a Laser-Plasma System

2017 ◽  
Vol 118 (1) ◽  
Author(s):  
D. Turnbull ◽  
C. Goyon ◽  
G. E. Kemp ◽  
B. B. Pollock ◽  
D. Mariscal ◽  
...  
Keyword(s):  
Refractive Index ◽  
Probe Beam ◽  
Laser Plasma ◽  
Plasma System
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