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Glasgow, United Kingdom

Coherent, Inc is a company with headquarters located in Santa Clara, California, USA, with other sites located in the US, Europe, and Asia. It was founded in 1966 by Eugene Watson as a spin-off from laser company Spectra-Physics and converted to public ownership in 1970. The company designs, manufactures and markets laser systems and components, laser measurement and control products, optics, and laser accessories, which are used both in industry and scientific research. According to the company's 2011 SEC filing, their markets are the microelectronics industry , scientific research, OEM components, and materials processing . Wikipedia.

Wisdom J.A.,Coherent Inc. | Gaume R.M.,Stanford University | Byer R.L.,Stanford University
Optics Express | Year: 2010

We demonstrate an optical technique, called laser-gain scanning microscopy (LGSM), to map dopant concentration profiles in engineered laser gain-media. The performance and application range of this technique are exampled on a Nd 3+ concentration profile embedded in a YAG transparent ceramic sample. Concentration profiles measured by both LGSM and SIMS techniques are compared and agree to within 5% over three-orders of magnitude in Nd 3+ doping level, from 0.001 at.% to 0.9 at.%. One of the unique advantages of LGSM over common physical methods such as SIMS, XPS and EMPA, is the ability to correlate optical defects with the final doping profile. © 2010 Optical Society of America. Source

Ignatova T.,Lehigh University | Najafov H.,Lehigh University | Najafov H.,Coherent Inc. | Ryasnyanskiy A.,Lehigh University | And 3 more authors.
ACS Nano | Year: 2011

Significant acceleration of the photoluminescence (PL) decay rate was observed in water solutions of two rare earth ions (REIs), Tb and Eu. We propose that the time-resolved PL spectroscopy data are explained by a fluorescence resonance energy transfer (FRET) between the REIs. FRET was directly confirmed by detecting the induced PL of the energy acceptor, Eu ion, under the PL excitation of the donor ion, Tb, with FRET efficiency reaching 7% in the most saturated solution, where the distance between the unlike REIs is the shortest. Using this as a calibration experiment, a comparable FRET was measured in the mixed solution of REIs with single-wall nanotubes (SWNTs) wrapped with DNA. From the FRET efficiency of 10% and 7% for Tb and Eu, respectively, the characteristic distance between the REI and SWNT/DNA was obtained as 15.9 ± 1.3 Å, suggesting that the complexes are formed because of Coulomb attraction between the REI and the ionized phosphate groups of the DNA. © 2011 American Chemical Society. Source

Morioka S.B.,Coherent Inc.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2011

OPS lasers have found applications in various industrial and scientific laser applications due to their power scaling capability, their wide range of emission wavelengths, physical size and their superior reliability. This paper provides an overview of commercially available OPS lasers and the applications in which they are used including biotechnology, medical, holography, Titanium-Sapphire laser pumping, non-lethal defense, forensics, and entertainment. Source

MacKanos M.A.,Vanderbilt University | Simanovskii D.M.,Coherent Inc. | Schriver K.E.,Vanderbilt University | Hutson M.S.,Vanderbilt University | And 3 more authors.
IEEE Journal on Selected Topics in Quantum Electronics | Year: 2012

There are significant benefits to medical laser surgeries performed with mid-infrared wavelengths, including the ability to select laser parameters in order to minimize photochemical and thermal collateral damage. It has been shown that a wavelength of 6.1 μm is optimal when high ablation efficiency and minimal collateral damage is desired in biological soft tissues. Historically, free electron lasers were the only option for ablating tissue at this wavelength due to their ample pulse energy and average power. In recent years, new sources are being developed for this wavelength that can successfully ablate tissue. These alternative sources have different pulse structures and pulse durations than free electron lasers, motivating investigation of how these parameters affect the ablation process. Here, we present the pulse duration dependence for mid-IR laser ablation of biological tissues at a wavelength of 6.1 μm on a tissue phantom of cooked egg white. The crater shape, depth, and volume all changed in a significant, nonmonotonic manner as the laser pulse duration was increased from 100 ns to 5 μs. © 2012 IEEE. Source

Dittmar H.,Laser Zentrum Hannover e.V. | Gabler F.,Coherent Inc. | Stute U.,Laser Zentrum Hannover e.V.
Physics Procedia | Year: 2013

Within this work the ablation behaviour of both carbon and glass fibre reinforced epoxy resin was assessed when ablated by a nanosecond-pulsed laser source emitting radiation in the ultra-violet spectrum. The investigation focussed on the influences of pulse overlap, focus spot diameter and resulting fluence on process quality and machining time. Results showed that ns-pulsed UV-lasers are capable of machining both types of fibre reinforced composites, while achieving good quality surfaces without burn marks or otherwise heat-damaged areas. © 2013 The Authors. Source

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