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https://www.readbyqxmd.com/read/29420027/uv-and-ir-photochemistries-of-malonaldehyde-trapped-in-cryogenic-matrices
#1
Aurelien Trivella, Tobias Nils Wassermann, Carine Manca Tanner, Nils O B Luettschwager, Stephane Coussan
UV and IR photochemistries of malonaldehyde, the simplest molecule exhibiting an intramolecular proton exchange, have been studied in four cryogenic matrices at 4.3 K, N2, Ne, Ar and Xe. Samples have been irradiated using a UV and IR OPO type tunable laser, and with a broad band UV mercury lamp. UV and IR spectra have been recorded and compared with theoretical calculations carried out at the SAC-CI/6-31++G(d,p) (UV transitions) and B3LYP/6-311++G(2d,2p) (IR spectra) levels of theory. After de- position, the intramolecularly H-bonded form is found exclusively, while several open forms are formed upon UV irradiation...
February 8, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29402014/mid-infrared-zgp-opo-with-divergence-compensation-and-high-beam-quality
#2
Martin Schellhorn, Gerhard Spindler, Marc Eichhorn
Divergence compensation, optimization of the optical-to-optical efficiency, and high beam quality of signal and idler beams of a high-energy mid-infrared ZnGeP2 (ZGP) optical parametric oscillator (OPO) have been demonstrated by use of a Galilean telescope inside the nonplanar fractional-image-rotation enhancement (FIRE) ring resonator. With a small variation of the distance between the lenses of the telescope, the divergences of signal and idler beams could be adjusted. Up to 36 mJ of mid-infrared pulse energy in the 3-5 µm wavelength range is obtained with 92 mJ of pump energy on crystal...
January 22, 2018: Optics Express
https://www.readbyqxmd.com/read/29401946/designable-cascaded-nonlinear-optical-frequency-conversion-integrating-multiple-nonlinear-interactions-in-two-ktioaso4-crystals
#3
Haitao Huang, Hui Wang, Shiqiang Wang, Deyuan Shen
We demonstrated a novel cascaded nonlinear frequency conversion that integrated OPO, SFG and SRS in two KTA crystals, realizing an efficient wavelength conversion from 1064 nm to multi-wavelength around 630 nm. The OPO and SRS were both performed in an x-cut KTA crystal to realize a noncritically phase-matched OPO and X(ZZ)X Raman conversion. The SFG was achieved in a (θ = 90◦, φ = 24.3◦)-cut KTA crystal with a type-II phase-matching configuration. Benefitting from the strong pulse-narrowing induced by the combined effect of OPO and SRS, a minimum pulse width of 13...
January 22, 2018: Optics Express
https://www.readbyqxmd.com/read/29401855/thermal-noise-in-mid-infrared-broadband-upconversion-detectors
#4
Ajanta Barh, Peter Tidemand-Lichtenberg, Christian Pedersen
Low noise detection with state-of-the-art mid-infrared (MIR) detectors (e.g., PbS, PbSe, InSb, HgCdTe) is a primary challenge owing to the intrinsic thermal background radiation of the low bandgap detector material itself. However, researchers have employed frequency upconversion based detectors (UCD), operable at room temperature, as a promising alternative to traditional direct detection schemes. UCD allows for the use of a low noise silicon-CCD/camera to improve the SNR. Using UCD, the noise contributions from the nonlinear material itself should be evaluated in order to estimate the limits of the noise-equivalent power of an UCD system...
February 5, 2018: Optics Express
https://www.readbyqxmd.com/read/29400835/30-5-%C3%AE-j-10-khz-picosecond-optical-parametric-oscillator-pumped-synchronously-and-intracavity-by-a-regenerative-amplifier
#5
Li-Jiao He, Ke Liu, Yong Bo, Zhao Liu, Xiao-Jun Wang, Feng Yang, Lei Yuan, Qin-Jun Peng, Da-Fu Cui, Zu-Yan Xu
We have proposed a novel approach to realize a high-energy ultrafast optical parametric oscillator (OPO) by intracavity pumping in a regenerative amplifier. In this way, we have experimentally demonstrated an unprecedented pulse energy of 30.5 μJ from a 1.5-μm singly resonant synchronously pumped OPO at a pulse repetition rate of 10 kHz with a pulse width of 7.0 ps. To the best of our knowledge, this is the highest pulse energy from an ultrafast laser OPO.
February 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29400823/spectrotemporal-dynamics-of-a-picosecond-opo-based-on-chirped-quasi-phase-matching-erratum
#6
Delphine Descloux, Cédric Laporte, Jean-Baptiste Dherbecourt, Jean-Michel Melkonian, Myriam Raybaut, Cyril Drag, Antoine Godard
This erratum is to correct an error made in our paper [Opt. Lett.40, 280 (2015)OPLEDP0146-959210.1364/OL.40.000280] regarding the sign of the quasi-phase matching chirp rate.
February 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29346262/important-facts-about-organ-donation-and-opo-performance
#7
David S Goldberg, Teresa Shafer, Laura Siminoff
No abstract text is available yet for this article.
January 18, 2018: Transplantation
https://www.readbyqxmd.com/read/29328277/efficient-1-7%C3%A2-%C3%A2-%C3%AE-m-light-source-based-on-kta-opo-derived-by-nd-yvo4-self-raman-laser
#8
Haiyong Zhu, Junhong Guo, Yanmin Duan, Jing Zhang, Yongchang Zhang, Changwen Xu, Hongyan Wang, Dianyuan Fan
An intra-cavity optical parametric oscillator (OPO) emitting at 1.7 μm derived by Nd:YVO4 self-Raman laser is demonstrated in this Letter, with a KTiOAsO4 (KTA) crystal used as nonlinear optical crystal. A laser diode end-pumped acousto-optic Q-switched Nd:YVO4 self-Raman laser at 1176 nm was employed as the pump source. At an incident pump power of 12.1 W and a pulse repetition frequency of 60 kHz, average output power up to 1.2 W signal light at 1742 nm was obtained, with diode-to-signal conversion efficiency of 10%...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29291287/orthopaedic-section-poster-presentations-abstracts-opo1-opo300
#9
(no author information available yet)
These abstracts are presented here as prepared by the authors. The accuracy and content of each abstract remain the responsibility of the authors. In the identification number above each abstract, OPO designates an Orthopaedic Section poster presentation. J Orthop Sports Phys Ther 2018;48(1):A67-A202. doi:10.2519/jospt.2018.48.1.A67.
January 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29277956/kidney-transplantation-and-waitlist-mortality-rates-among-candidates-registered-as-willing-to-accept-a-hepatitis-c-infected-kidney
#10
Brittany A Shelton, Deirdre Sawinski, Shikha Mehta, Rhiannon D Reed, Paul A MacLennan, Jayme E Locke
BACKGROUND: HCV-infected (HCV+) ESRD patients derive significant survival benefit from kidney transplantation (KT) over remaining on dialysis. Given high mortality rates on dialysis and the unique ability to accept HCV+ and HCV- donor kidneys, understanding their access to KT is essential. METHODS: 3,963 adult kidney-only candidates reported as willing to accept an HCV+ kidney from 2008-2014 were identified and assumed to be HCV+. Time-at-risk began at date of listing...
December 26, 2017: Transplant Infectious Disease: An Official Journal of the Transplantation Society
https://www.readbyqxmd.com/read/29245851/widely-tunable-and-narrow-bandwidth-pulsed-mid-ir-ppmgln-opo-by-self-seeding-dual-etalon-coupled-cavities
#11
Tinglun Xing, Li Wang, Shuwu Hu, Tingqing Cheng, Xianyou Wu, Haihe Jiang
Integrating narrow-bandwidth and wavelength tunability together is crucially important in upgrading the applications of optical parametric oscillators (OPO). Here, we have demonstrated a widely tunable, narrow-bandwidth and efficient mid-IR OPO pumped by a single-longitudinal-mode pulsed Yb-fiber laser. By restricting the bandwidth of the oscillated signal via self-seeding dual etalon-coupled cavities, the bandwidth of the idler can be suppressed to about 0.35 nm, with a wide tunable range of 2.85-3.05 μm, which can be achieved by synergistically adjusting the temperatures of PPMgLN crystal and one of the etalons...
December 11, 2017: Optics Express
https://www.readbyqxmd.com/read/29243536/variation-in-pediatric-organ-donor-management-practices-among-us-organ-procurement-organizations
#12
Robert S Ream, Eric S Armbrecht
INTRODUCTION: Reports of actual pediatric organ donor management practice among US organ procurement organizations are sparse, and the use of standardized management guidelines is unknown. A recent consensus statement from the Society of Critical Care Medicine, the American College of Chest Physicians, and the Association of Organ Procurement Organizations offers guidelines for the management of the pediatric organ donor. RESEARCH QUESTION: To describe the use of guidelines and routine practices in the management of the pediatric organ donor with respect to hemodynamics, lung and ventilator management, fluid and electrolytes, hormonal replacement therapy, the use of blood products, thermoregulation, and prophylactic antibiotics...
January 1, 2017: Progress in Transplantation
https://www.readbyqxmd.com/read/29234601/the-characterization-of-an-economic-and-portable-led-based-photoacoustic-imaging-system-to-facilitate-molecular-imaging
#13
Ali Hariri, Jeanne Lemaster, Junxin Wang, AnanthaKrishnan S Jeevarathinam, Daniel L Chao, Jesse V Jokerst
Photoacoustic imaging (PAI) is a non-invasive, high-resolution hybrid imaging modality that combines optical excitation and ultrasound detection. PAI can image endogenous chromophores (melanin, hemoglobin, etc.) and exogenous contrast agents in different medical applications. However, most current equipment uses sophisticated and complicated OPO lasers with tuning and stability features inconsistent with broad clinical deployment. As the number of applications of PAI in medicine increases, there is an urgent need to make the imaging equipment more compact, portable, and affordable...
March 2018: Photoacoustics
https://www.readbyqxmd.com/read/29229159/socioeconomic-factors-as-predictors-of-organ-donation
#14
Malay B Shah, Valery Vilchez, Adam Goble, Michael F Daily, Jonathan C Berger, Roberto Gedaly, Derek A DuBay
BACKGROUND: Despite numerous initiatives to increase solid organs for transplant, the gap between donors and recipients widens. There is little in the literature identifying socioeconomic predictors for donation. We evaluate the correlation between socioeconomic factors and familial authorization for donation. METHODS: A retrospective analysis of adult potential donor referrals between 2007 and 2012 to our organ procurement organization (OPO) was performed. Potential donor information was obtained from the OPO database, death certificates, and the US Census Report...
January 2018: Journal of Surgical Research
https://www.readbyqxmd.com/read/29226765/never-declared-brain-dead-potential-organ-donors-an-additional-source-of-donor-organs
#15
Patricia A Webster, Lori E Markham
CONTEXT: Patients never declared brain dead may represent an additional source of donor organs. OBJECTIVE: To determine the number of likely brain dead potential donors who are never declared brain dead and to compare them with brain dead and donation after cardiac death potential organ donors. DESIGN, SETTING, AND PARTICIPANTS: This study was a retrospective chart review of all catastrophically brain-injured patients referred to a single-organ procurement organization (OPO) over a 4-year period...
January 1, 2017: Progress in Transplantation
https://www.readbyqxmd.com/read/29225719/methane-optical-density-measurements-with-an-integrated-path-differential-absorption-lidar-from-an-airborne-platform
#16
Haris Riris, Kenji Numata, Stewart Wu, Brayler Gonzalez, Michael Rodriguez, Stan Scott, Stephan Kawa, Jianping Mao
We report on an airborne demonstration of atmospheric methane (CH4) measurements with an Integrated Path Differential Absorption (IPDA) lidar using an optical parametric amplifier (OPA) and optical parametric oscillator (OPO) laser transmitter and sensitive avalanche photodiode detector. The lidar measures the atmospheric CH4 absorption at multiple, discrete wavelengths near 1650.96 nm. The instrument was deployed in the fall of 2015, aboard NASA's DC-8 airborne laboratory along with an in-situ spectrometer and measured CH4 over a wide range of surfaces and atmospheric conditions from altitudes of 2 km to 13 km...
July 2017: Journal of Applied Remote Sensing
https://www.readbyqxmd.com/read/29222991/salivary-immune-proteins-monitoring-can-help-detection-of-binge-and-chronic-alcohol-drinkers-preliminary-findings
#17
Napoleon Waszkiewicz, Beata Galińska-Skok, Anna Zalewska, Sławomir Dariusz Szajda, Krzysztof Zwierz, Magdalena Więdłocha, Agata Szulc
BACKGROUND: We compared effects of binge and chronic alcohol drinking on oral health and salivary immunity proteins. METHODS: The study involved males: 13 healthy social-drinking (C), 10 alcohol-dependent after chronic alcohol-intoxication (A), and 8 binge-drinkers after a single binge-drinking session (B). We compared periodontal/dental state and salivary immune proteins (lactoferrin -Lf, lysozyme -Lz, oral peroxidase -OPO, immunoglobulin A -IgA) in all groups...
December 1, 2017: Drug and Alcohol Dependence
https://www.readbyqxmd.com/read/29222929/hiv-deceased-donor-referrals-a-national-survey-of-organ-procurement-organizations
#18
Ayla Cash, Xun Luo, Eric K H Chow, Mary Grace Bowring, Ashton A Shaffer, Brianna Doby, Corey E Wickliffe, Charles Alexander, Deborah McRann, Aaron A R Tobian, Dorry L Segev, Christine M Durand
BACKGROUND: HIV-infected (HIV+) donor organs can be transplanted into HIV+ recipients under the HIV Organ Policy Equity (HOPE) Act. Quantifying HIV+ donor referrals received by Organ Procurement Organizations (OPOs) is critical for HOPE Act implementation. METHODS: We surveyed the 58 US OPOs regarding HIV+ referral records and newly discovered HIV+ donors. Using data from OPOs that provided exact records and CDC HIV prevalence data, we projected a national estimate of HIV+ referrals...
December 9, 2017: Clinical Transplantation
https://www.readbyqxmd.com/read/29216431/photochemistry-of-acetohydroxamic-acid-in-solid-argon-ftir-and-theoretical-studies
#19
Magdalena Sałdyka, Zofia Mielke
The products formed during exposure of the CH3CONHOH/Ar (AHA/Ar) matrices to the full output of the Xe lamp and to 225 nm OPO radiation are studied. The irradiation promotes the isomerization, 1Z -1E, and AHA photodissociation reactions. Four pairs of co-products are experimentally found to appear in the photolysis, they form the complexes: CH3OH-HNCO (1), H2O-CH3NCO (2), H2O-CH3CNO (3) and CO-CH3NHOH (4). The structures of the complexes were optimized at the MP2 computational level with the 6-311++G(2d,2p) and aug-cc-pVTZ basis sets...
December 7, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29216130/third-order-nonlinearity-opo-schmidt-mode-decomposition-and-tripartite-entanglement
#20
C González-Arciniegas, Nicolas Treps, P Nussenzveig
We investigate quantum properties of light in optical parametric oscillators (OPOs) based on four-wave mixing gain in media with third-order nonlinearities. In spite of other competing χ(3) effects such as phase modulation, bipartite and tripartite entanglement is predicted above threshold. These findings are relevant for recent implementations of complementary metal-oxide-semiconductor (CMOS)-compatible on-chip OPOs.
December 1, 2017: Optics Letters
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