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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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Single-shot measurement of ultrafast time-varying phase modulation induced by femtosecond laser pulses with arbitrary polarization

Klaus Hartinger and Randy A. Bartels

Appl. Phys. Lett. 92, 021126 (2008); http://dx.doi.org/10.1063/1.2801515 (3 pages) | Cited 8 times

Online Publication Date: 18 January 2008

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We demonstrate a single-shot measurement of the transient phase modulation due to field free molecular alignment at the revival times of a rotational wave packet. The wave packet is excited by an arbitrarily polarized ultrashort laser pulse in CO2 at room temperature. With this technique the time dependence along the eigenpolarization directions of the linear susceptibility tensor, i.e., the time dependence of its principle components, can be directly observed with high sensitivity.
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33.80.-b Photon interactions with molecules

Linear optical protocol for preparation of N-photon Greenberger–Horne–Zeilinger state with conventional photon detectors

Yan Xia, Jie Song, and He-Shan Song

Appl. Phys. Lett. 92, 021127 (2008); http://dx.doi.org/10.1063/1.2836268 (3 pages) | Cited 29 times

Online Publication Date: 18 January 2008

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We propose a linear optical protocol to generate Greenberger–Horne–Zeilinger (GHZ) state of N distant photons with the certain success probability. The proposed setup involves simple linear optical elements, N pairs of the two-photon polarization entangled states, and the conventional photon detectors that only distinguish the vacuum and nonvacuum Fock number states. This makes the protocol more realizable in experiments.
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03.67.Bg Entanglement production and manipulation

Modulation of the two-photon absorption by electric fields in HgCdTe photodiode

H. Y. Cui, Z. F. Li, Z. L. Liu, C. Wang, X. S. Chen, X. N. Hu, Z. H. Ye, and W. Lu

Appl. Phys. Lett. 92, 021128 (2008); http://dx.doi.org/10.1063/1.2835049 (3 pages) | Cited 10 times

Online Publication Date: 18 January 2008

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We demonstrate the tunability of the two-photon absorption (TPA) coefficient by adjusting the electric field in a HgCdTe (MCT) photodiode with cutoff wavelength of 5.2 μm. The TPA coefficient was measured by using a picosecond pulsed laser with wavelength of 7.92 μm. An enhancement of the TPA coefficient occurs in the space charge region of the MCT pn junction, which can be attributed to the Franz–Keldysh effect induced by the built-in electric field. By applying a reverse bias to intensify the built-in field, the TPA coefficient is found to be further enhanced by a factor of 18.9. This electric field dependence of the TPA coefficient has been fairly interpreted by the pn junction model with the Franz–Keldysh effect included.
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85.60.Dw Photodiodes; phototransistors; photoresistors
73.40.Lq Other semiconductor-to-semiconductor contacts, p-n junctions, and heterojunctions

Phosphor-conversion white light using InGaN ultraviolet laser diode

Yun Xu, Lianghui Chen, Yuzhang Li, Guofeng Song, Yuping Wang, Weidong Zhuang, and Zhen Long

Appl. Phys. Lett. 92, 021129 (2008); http://dx.doi.org/10.1063/1.2835703 (3 pages) | Cited 12 times

Online Publication Date: 18 January 2008

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We fabricated a phosphor-conversion white light using an InGaN laser diode that emits 405 nm near-ultraviolet (n-UV) light and phosphors that emit in the blue and yellow regions when excited by the n-UV and blue light, respectively.The relationship of the luminous flux and the luminous efficacy of the white light with injection current was discussed. The luminous flux increased linearly with increasing current above the threshold of the laser diode, and at 80 mA injection current, the luminous flux and luminous efficacy were estimated to be 5.7 lm and 13 lm/w, respectively. The shift of the Commission International de I’Eclairage coordinates, color temperature, and color rendering index with current are very slight and negligible, which indicates that the blue and the yellow phosphors have an excellent stability and a highly stable white light can be obtained by this way.
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42.55.Px Semiconductor lasers; laser diodes
78.55.Et II-VI semiconductors
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