-
Quantitative carbon measurement in anthracite using laser-induced breakdown spectroscopy with binder
Tingbi Yuan, Zhe Wang, Lizhi Li, Zongyu Hou, Zheng Li, Weidou Ni
Quantitative carbon measurement in anthracites remains difficult with laser-induced breakdown spectroscopy (LIBS) due to its relatively high measurement uncertainty. To improve the measurement repeatability, binders to bind the anthracite powder together were utilized for LIBS measurement. Results ... [Appl. Opt. 51, B22-B29 (2012)]
-
Simultaneous wavenumber measurement and coherence detection using temporal phase unwrapping
A. Davila, J. M. Huntley, C. Pallikarakis, P. D. Ruiz, J. M. Coupland
Wavelength scanning interferometry and swept-source optical coherence tomography require accurate measurement of time-varying laser wavenumber changes. We describe here a method based on recording interferograms of multiple wedges to provide simultaneously high wavenumber resolution and immunity to ... [Appl. Opt. 51, 558-567 (2012)]
-
High peak-power single-frequency pulses using multiple stage, large core phosphate fibers and preshaped pulses
Eliot Petersen, Wei Shi, Arturo Chavez-Pirson, Nasser Peyghambarian
We have developed a monolithic high power pulsed fiber laser in a master oscillator power amplifier (MOPA) configuration, which is capable of reaching 0.38 mJ pulse energy and 128 kW peak power for 3 ns pulses at ?1550??nm while maintaining transform-limited linewidth. The fiber laser pulse ... [Appl. Opt. 51, 531-534 (2012)]
-
Image degradation due to surface scatter in the presence of aberrations
Narak Choi, James E. Harvey
Image analysis in the presence of surface scatter due to residual optical fabrication errors is often perceived to be complicated, nonintuitive, and achieved only by computationally intensive nonsequential ray tracing with commercial optical analysis codes such as ASAP, Zemax, Code V, TracePro, or ... [Appl. Opt. 51, 535-546 (2012)]
-
Instrumentation design for bridge scour monitoring using fiber Bragg grating sensors
Wen Xiong, C. S. Cai, Xuan Kong
Scour is one of the main causes of bridge failures. In order to measure and monitor scour depth variations including deposition (refilling) process, three designs for a scour monitoring system using fiber Bragg grating (FBG) sensors are discussed in the present study. By a comparative study, one of ... [Appl. Opt. 51, 547-557 (2012)]
-
Study of a novel and simple method of generating binary mask for microprism fabrication
Arash Sabatyan, Alireza Hemmat
A new and simple method for generating binary masks for fabrication of gray scale micro-optical elements is proposed and examined. In this technique the main idea is superimposing two or more gratings with slightly different pitches that depend on the considered gray tone level. This causes ... [Appl. Opt. 51, 525-530 (2012)]
-
Concept, modeling, and performance prediction of a low-cost, large deformable mirror
Rikard Heimsten, Douglas G. MacMynowski, Torben Andersen, Mette Owner-Petersen
While it is attractive to integrate a deformable mirror (DM) for adaptive optics (AO) into the telescope itself rather than using relay optics within an instrument, the resulting large DM can be expensive, particularly for extremely large telescopes. A low-cost approach for building a large DM is ... [Appl. Opt. 51, 515-524 (2012)]
-
Analysis of time-resolved superposed atomic hydrogen Balmer lines and molecular diatomic carbon spectra
Christian G. Parigger, Alexander Woods, James O. Hornkohl
We present analysis of superposition spectra following laser-induced breakdown (LIB) of methane. Both hydrogen-beta and hydrogen-gamma lines contain discernible contributions from diatomic carbon emissions for time delays of 1 to 2 ?s from pulsed, 8 ns, infrared Nd:YAG laser radiation LIB. ... [Appl. Opt. 51, B1-B6 (2012)]
-
Laser-induced plasma chemistry of the explosive RDX with various metallic nanoparticles
Jennifer L. Gottfried
The feasibility of exploiting plasma chemistry to study the chemical reactions between metallic nanoparticles and molecular explosives such as cyclotrimethylenetrinitramine (RDX) has been demonstrated. This method, based on laser-induced breakdown spectroscopy, involves the production of ... [Appl. Opt. 51, B13-B21 (2012)]
-
Multiband sensor using thick holographic gratings for sulfur detection by laser-induced breakdown spectroscopy
Daniel Gagnon, Simon Lessard, Marc Verhaegen, Patrick Mutchmore, Paul Bouchard, François R. Doucet, Mohamad Sabsabi
Detection of sulfur by optical emission spectroscopy generally presents some difficulties because the strongest lines are in the vacuum UV below 185 nm and therefore are readily absorbed by oxygen molecules in air. A novel concept for a low-cost and efficient system to detect sulfur using near-IR ... [Appl. Opt. 51, B7-B12 (2012)]
|
