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17 Aug 2009

Volume 95, Issue 7, Articles (07xxxx)

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Appl. Phys. Lett. 95, 073703 (2009); http://dx.doi.org/10.1063/1.3152768 (3 pages)

Mohammud R. Noor, Swati Goyal, Shawn M. Christensen, and Samir M. Iqbal
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Drastic improvement in the S-band relativistic magnetron operation

A. Sayapin, Y. Hadas, and Ya. E. Krasik

Appl. Phys. Lett. 95, 074101 (2009); http://dx.doi.org/10.1063/1.3206939 (3 pages) | Cited 2 times

Online Publication Date: 17 August 2009

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The superior operation of a S-band relativistic magnetron powered by a Linear Induction Accelerator with ≤ 400 kV, ≤ 4 kA, and ∼ 150 ns output pulses was revealed when the magnetron was coupled with a resonance load and a part of the generated microwave power stored in the resonator was reflected back to the magnetron. It is shown that, under optimal conditions, the efficiency of the magnetron operation increases by ∼ 40% and the generated microwave power reaches the power of the electron beam.
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84.40.Fe Microwave tubes (e.g., klystrons, magnetrons, traveling-wave, backward-wave tubes, etc.)
29.20.Ej Linear accelerators
41.75.Ht Relativistic electron and positron beams
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Single-beam coherent anti-Stokes Raman scattering spectroscopy of N2 using a shaped 7 fs laser pulse

Sukesh Roy, Paul Wrzesinski, Dmitry Pestov, Tissa Gunaratne, Marcos Dantus, and James R. Gord

Appl. Phys. Lett. 95, 074102 (2009); http://dx.doi.org/10.1063/1.3207829 (3 pages) | Cited 12 times

Online Publication Date: 17 August 2009

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The feasibility is explored by single-beam coherent anti-Stokes Raman scattering (CARS) spectroscopy of gas-phase diatomic molecules related to combusting flows, with implications for gas-phase thermometry. We demonstrate CARS of gas-phase N2 using a shaped ∼ 7 fs laser pulse, investigate the dependence of the CARS signal on the total pressure of the probed environment, both in pure N2 and in mixtures with Ar, discuss the observed signal-to-noise ratio, and suggest improvements to be considered for reliable single-shot measurements at flame temperatures.
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33.20.Fb Raman and Rayleigh spectra (including optical scattering)
33.80.-b Photon interactions with molecules

Phonon recycling in ion-doped lasers

Jedo Kim and Massoud Kaviany

Appl. Phys. Lett. 95, 074103 (2009); http://dx.doi.org/10.1063/1.3207824 (3 pages) | Cited 1 time

Online Publication Date: 19 August 2009

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Phonon emission is an energy-conversion efficiency loss in photonic transition processes. Phonon recycling by the anti-Stokes cooling results in a lower operating temperature. Transmitted optical phonons cross heterogeneous boundary and the upconverted acoustic phonons contribute to higher occupancy of the optical phonon and increase the second-order transition rate. Optimization of phonon spectra makes upconversion favorable. We present theoretical study and quantitative efficiency results for phonon recycling in Yb3+ doped yttria alumina garnet lasing layer and its adjacent Yb3+:ZrF2 cooling layers and examine the thermodynamic limits. It is predicted that 30% of emitted phonons are recycled and further improvement is possible.
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42.55.Rz Doped-insulator lasers and other solid state lasers
63.22.Np Layered systems
63.20.D- Phonon states and bands, normal modes, and phonon dispersion
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