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Your search keyword '"Zhou K."' showing total 11 results
Start Over Author "Zhou K." Journal applied physics letters
11 results on '"Zhou K."'

2. Ridge width effect on comb operation in terahertz quantum cascade lasers.

Author

Zhou, K., Li, H., Wan, W. J., Li, Z. P., Liao, X. Y., and Cao, J. C.

Subjects
*QUANTUM cascade lasers, *GROUP velocity dispersion, *WAVEGUIDES, *DISPERSION (Chemistry), *QUANTUM well lasers
Abstract

We systematically investigate the laser ridge width effect on comb operation of single plasmon waveguide quantum cascade lasers emitting around 4.2 THz. The total group velocity dispersion (GVD), including the gain, waveguide, and material dispersions, is numerically evaluated for 6-mm long lasers with ridge widths varying from 100 to 200 μm. The simulation reveals that although calculated waveguide GVDs of lasers with different ridge widths are almost identical, the clamped gain dispersion partially determined by the frequency-dependent waveguide loss strongly contributes to the total GVD. From the simulation, we find that the laser with a 150-μm-wide ridge shows the flattest total GVD in the lasing range between 4.05 and 4.35 THz. The optimal ridge width of 150 μm for comb operation is also experimentally verified by intermode beat note and on-chip dual-comb measurements. [ABSTRACT FROM AUTHOR]

Published
2019
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3. Proton beam shaped by “particle lens” formed by laser-driven hot electrons

Author

Zhai, S. H., primary, Shen, B. F., additional, Wang, W. P., additional, Zhang, H., additional, He, S. K., additional, Lu, F., additional, Zhang, F. Q., additional, Deng, Z. G., additional, Dong, K. G., additional, Wang, S. Y., additional, Zhou, K. N., additional, Xie, N., additional, Wang, X. D., additional, Zhang, L. G., additional, Huang, S., additional, Liu, H. J., additional, Zhao, Z. Q., additional, Gu, Y. Q., additional, Zhang, B. H., additional, and Xu, Z. Z., additional

Published
2016
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4. Strong magnetic fields generated with a simple open-ended coil irradiated by high power laser pulses

Author

Zhu, B. J., primary, Li, Y. T., additional, Yuan, D. W., additional, Li, Y. F., additional, Li, F., additional, Liao, G. Q., additional, Zhao, J. R., additional, Zhong, J. Y., additional, Xue, F. B., additional, He, S. K., additional, Wang, W. W., additional, Lu, F., additional, Zhang, F. Q., additional, Yang, L., additional, Zhou, K. N., additional, Xie, N., additional, Hong, W., additional, Wei, H. G., additional, Zhang, K., additional, Han, B., additional, Pei, X. X., additional, Liu, C., additional, Zhang, Z., additional, Wang, W. M., additional, Zhu, J. Q., additional, Gu, Y. Q., additional, Zhao, Z. Q., additional, Zhang, B. H., additional, Zhao, G., additional, and Zhang, J., additional

Published
2015
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6. High efficient GaN-based laser diodes with tunnel junction

Author

Feng, M. X., primary, Liu, J. P., additional, Zhang, S. M., additional, Jiang, D. S., additional, Li, Z. C., additional, Zhou, K., additional, Li, D. Y., additional, Zhang, L. Q., additional, Wang, F., additional, Wang, H., additional, Chen, P., additional, Liu, Z. S., additional, Zhao, D. G., additional, Sun, Q., additional, and Yang, H., additional

Published
2013
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11. Ultra-broad spontaneous emission and modal gain spectrum from a hybrid quantum well/quantum dot laser structure.

Author

Chen, S. M., Zhou, K. J., Zhang, Z. Y., Childs, D. T. D., Hugues, M., Ramsay, A. J., and Hogg, R. A.

Subjects
*PHYSICS research, *QUANTUM dots, *QUANTUM electronics, *SEMICONDUCTORS, *QUANTUM wells, *EXCITATION spectrum, *NUCLEAR excitation, *OPTICAL coherence tomography
Abstract

We propose and demonstrate a hybrid quantum well/quantum dot structure to enhance the gain and spontaneous emission bandwidth of a quantum dot active region. A single quantum well is introduced into a multi-layer stack of quantum dots, spectrally positioned to cancel the losses due to the second excited state of the dots. As a result, the modal gain at room temperature is extended to 300 nm, covering the wavelength range of 1100-1400 nm, and spontaneous emission has a 250 nm, 3 dB linewidth from 1080-1335 nm, of interest to short-haul telecom and optical coherence tomography applications. [ABSTRACT FROM AUTHOR]

Published
2012
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