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RISS 인기검색어
- 검색키워드
- 저자 : Xiquan Fu (검색결과 3 건)
- 무료
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Nonlinear Increase of Spatial Noise for Ultrashort Pulses with Different Temporal Widths
Lifu Zhang,Xiquan Fu,Jianqin Deng,Hua Yang,Youwen Wang,Shuangchun Wen,Huiwen Xu,Jinggui Zhang,Jin Zhang,Dianyuan Fan 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.2
In this paper, the dynamic evolution of the spatial noise modulation of ultrashort laser pulses in carbon disulfide (CS2) is investigated experimentally, and different temporal widths of the stretched pulse are analyzed for spatial noise gain. The spatial noise evolution (i.e., small-scale self-focusing) of ultrashort laser pulses with different temporal widths as a function of the length of the CS2 has been observed. If the spectral bandwidth is invariant, the experimental results show that a stretched pulse with a broader temporal width can postpone the small-scale self-focusing of spatial noise for longer medium length with constant input power or for greater input power with the same medium length. In this paper, the dynamic evolution of the spatial noise modulation of ultrashort laser pulses in carbon disulfide (CS2) is investigated experimentally, and different temporal widths of the stretched pulse are analyzed for spatial noise gain. The spatial noise evolution (i.e., small-scale self-focusing) of ultrashort laser pulses with different temporal widths as a function of the length of the CS2 has been observed. If the spectral bandwidth is invariant, the experimental results show that a stretched pulse with a broader temporal width can postpone the small-scale self-focusing of spatial noise for longer medium length with constant input power or for greater input power with the same medium length.
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Quadratic Nonlinear Technologies for Femtosecond Lasers
Liejia Qian,Guang Xu,Hang Luo,Heyuan Zhu,Peng Yuan,Tao Wang,Xiquan Fu 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
Quadratic optical nonlinearity (2) can be exploited in femtosecond lasers and regarded as a significant new degree of freedom for the design of short-pulse sources. We will review our recent progress on developing nonlinear quadratic technologies for femtosecond lasers. Our nonlinear laser technology offers new properties for femtosecond lasers, including optical parametric amplifier with novel working regime, efficient second harmonic generation, and time telescope.
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Optical Properties of Leaky Modes of Photonic Crystal Waveguides
Hao Zhang,Liejia Qian,Dianyuan Fan,Heyuan Zhu,Xiquan Fu 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.5I
We used the scattering-matrix numerical method to calculate the reflectivity and the polarization conversion efficiency of multilayered photonic crystal waveguide (PhCW) and the surface-coupling technique to plot its leaky bands. Because of the vertical confinement of PhCW, a TE-polarized incident wave is partially transferred into a reflected wave containing a TM-polarized component, however, the conversion efficiency is weak, and such a conversion vanishes for waves incident along directions possessing reflection symmetry. By comparing the reflection spectrum with the polarization conversion efficiency curves, we found that their resonance patterns were identical and that dips in the former corresponded to peaks in the latter.
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