Wiens R.C.,Los Alamos National Laboratory |
Maurice S.,CNRS Institute for research in astrophysics and planetology |
Maurice S.,Hoffmann-La Roche |
Barraclough B.,Los Alamos National Laboratory |
And 95 more authors.
Space Science Reviews | Year: 2012
The ChemCam instrument suite on the Mars Science Laboratory (MSL) rover Curiosity provides remote compositional information using the first laser-induced breakdown spectrometer (LIBS) on a planetary mission, and provides sample texture and morphology data using a remote micro-imager (RMI). Overall, ChemCam supports MSL with five capabilities: remote classification of rock and soil characteristics; quantitative elemental compositions including light elements like hydrogen and some elements to which LIBS is uniquely sensitive (e.g., Li, Be, Rb, Sr, Ba); remote removal of surface dust and depth profiling through surface coatings; context imaging; and passive spectroscopy over the 240-905 nm range. ChemCam is built in two sections: The mast unit, consisting of a laser, telescope, RMI, and associated electronics, resides on the rover's mast, and is described in a companion paper. ChemCam's body unit, which is mounted in the body of the rover, comprises an optical demultiplexer, three spectrometers, detectors, their coolers, and associated electronics and data handling logic. Additional instrument components include a 6 m optical fiber which transfers the LIBS light from the telescope to the body unit, and a set of onboard calibration targets. ChemCam was integrated and tested at Los Alamos National Laboratory where it also underwent LIBS calibration with 69 geological standards prior to integration with the rover. Post-integration testing used coordinated mast and instrument commands, including LIBS line scans on rock targets during system-level thermal-vacuum tests. In this paper we describe the body unit, optical fiber, and calibration targets, and the assembly, testing, and verification of the instrument prior to launch. © 2012 The Author(s).
Schuberts F.,CeramOptec GmbH |
Hoben A.,CeramOptec GmbH |
Bakhshpour K.,CeramOptec Industries Inc. |
Provost C.,CeramOptec Industries Inc.
Photonics Spectra | Year: 2011
A square-core optical fiber coupled with laser diode output beams offers several advantages such as it allows greater coupling efficiency in applications such as spectroscopy and laser machining, where rectilinear illumination patterns are needed. Fibers with a square core can have a circular cladding so that they are compatible with standard ferrules and mountings, or they can have a uniform cladding to maintain the square shape. Square fibers are highly multimode and perform a great deal of ray mixing during optical propagation. The result of this mixing is homogeneous output beam intensity across the core area. Imaging the square core onto the target surface readily produces rectangular treatment areas with sharp corners and edges, with minimal cost. The fiber bundle can be packed together at one end to maximize the capture of the light, then arranged so the fibers form a line at the bundle's other end to maximize the illumination of the spectroscope's entry slit.
Skutnik B.J.,CeramOptec Industries Inc.
Progress in Biomedical Optics and Imaging - Proceedings of SPIE | Year: 2010
Hard Plastic Clad Silica (HPCS) optical fibers with pure silica cores have been developed which are robust and have NA(Numerical Aperture)>0.50. Improved clad only HPCS fibers have been produced for both new 'standard' and 'high' NA versions. Based on new cladding formulations, the 'standard' NA fiber has an NA of 0.41, while the new ultrahigh NA fiber has an NA of 0.54. Mechanical strength and preliminary fatigue data are presented along with spectral characterization data. For the first time significant results were obtained for clad only high NA fibers, The fibers are useful for diagnostic and surgical applications. Short to medium length time to failure results, indicate that the static fatigue parameters of the new high numerical aperture (NA) optical fibers are at least as good as those for former standard NA (0.37) HPCS fibers, which is an advance from previous results on the older formulation high NA fibers. © 2010 Copyright SPIE - The International Society for Optical Engineering.
Skutnik B.J.,CeramOptec Industries Inc.
Progress in Biomedical Optics and Imaging - Proceedings of SPIE | Year: 2013
Medical treatments benefit from increased sharpness of radiation emission or detection. Noncircular core silica/silica optical fibers have benefits of better control of irradiation of diseased tissue and more uniform irradiations. Description of tested fiber structures and others available are presented Data will be presented on mechanical reliability of such fibers, primarily, medium-to-long term static fatigue experiments as well as shorter term strength experiments. Spectral behavior will also be presented. The loss of radial symmetry provides for more uniform output across the core face. These fibers have mechanical properties remarkably as good as standard circular core fibers, with high dynamic strengths and very good Static Fatigue Parameters. © 2013 Copyright SPIE.