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14 Jan 2008

Volume 92, Issue 2, Articles (02xxxx)

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Appl. Phys. Lett. 92, 022509 (2008); http://dx.doi.org/10.1063/1.2807274 (3 pages)

Sang-Koog Kim, Ki-Suk Lee, Young-Sang Yu, and Youn-Seok Choi
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Resonantly photopumped lasing and its switching behavior in a photonic crystal nanolaser

Kengo Nozaki, Shota Kita, Yoshiki Arita, and Toshihiko Baba

Appl. Phys. Lett. 92, 021501 (2008); http://dx.doi.org/10.1063/1.2832670 (3 pages) | Cited 1 time

Online Publication Date: 14 January 2008

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A GaInAsP photonic crystal nanolaser was operated by resonant optical pumping in which the effective cavity area was selectively excited. The laser mode intensity was markedly enhanced when the pump wavelength was tuned to a higher-order cavity mode, and room-temperature continuous-wave lasing was obtained in the fundamental mode. Furthermore, the switching behavior due to a modal wavelength shift was clearly observed, suggesting the possibility of bistable operation, and so on.
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42.55.Px Semiconductor lasers; laser diodes
42.65.Pc Optical bistability, multistability, and switching, including local field effects

Electron plasma wave propagation in external-electrode fluorescent lamps

Guangsup Cho, Jung-Hyun Kim, Jong-Mun Jeong, Byoung-Hee Hong, Je-Huan Koo, Eun-Ha Choi, John P. Verboncoeur, and Han Sup Uhm

Appl. Phys. Lett. 92, 021502 (2008); http://dx.doi.org/10.1063/1.2832669 (3 pages) | Cited 8 times

Online Publication Date: 15 January 2008

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The optical propagation observed along the positive column of external electrode fluorescent lamps is shown to be an electron plasma wave propagating with the electron thermal speed of (kTe/m)1/2. When the luminance of the lamp is 10 000–20 000 cd/m2, the electron plasma temperature and the plasma density in the positive column are determined to be kTe ∼ 1.26–2.12 eV and no ∼ (1.28–1.69)×1017 m−3, respectively.
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52.40.Db Electromagnetic (nonlaser) radiation interactions with plasma
52.25.Os Emission, absorption, and scattering of electromagnetic radiation
52.35.-g Waves, oscillations, and instabilities in plasmas and intense beams
52.80.-s Electric discharges

Pinch current limitation effect in plasma focus

S. Lee and S. H. Saw

Appl. Phys. Lett. 92, 021503 (2008); http://dx.doi.org/10.1063/1.2827579 (3 pages) | Cited 20 times

Online Publication Date: 17 January 2008

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The Lee model couples the electrical circuit with plasma focus dynamics, thermodynamics, and radiation. It is used to design and simulate experiments. A beam-target mechanism is incorporated, resulting in realistic neutron yield scaling with pinch current and increasing its versatility for investigating all Mather-type machines. Recent runs indicate a previously unsuspected “pinch current limitation” effect. The pinch current does not increase beyond a certain value however low the static inductance is reduced to. The results indicate that decreasing the present static inductance of the PF1000 machine will neither increase the pinch current nor the neutron yield, contrary to expectations.
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52.58.Lq Z-pinches, plasma focus, and other pinch devices
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