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- 저자 : Xuefen Xu (검색결과 2 건)
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Uniform Side Illumination Generated from LEDs Arranged by an Annealing Algorithm
Xu Wang,Panling Lei,Chaoyi Qian,Zhiping Wang,Xuefen Xu,Zhouping Su 한국광학회 2022 Current Optics and Photonics Vol.6 No.3
Given a cubic space, it is easy to uniformly illuminate the floor with light sources placed on top. However, little has been reported about uniform illumination on walls with the same configuration of light sources. Here we present a luminaire consisting of nine light-emitting diodes (LEDs) with perfect Lambertian distribution, placed on the top as a 3 × 3 rectangular LED array. The distances between LEDs and tilt angles of each individual LED are adjustable and optimized by an annealing algorithm. After optimization, the array produces a rectangular illumination pattern on one wall with a uniformity of about 89%. Analysis shows that the tilt angles of individual LEDs are key parameters for uniform side illumination. In a scenario that is more practical, the tilt angles of all the LEDs are set to be the same, only decreasing the uniformity to 83%.
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Response of Water Tetramer to Intense Femtosecond Laser Pulses
Zhiping Wang,Xuefen Xu,Chaoyi Qian,Yanbiao Wang,Xu Wang 한국광학회 2017 Current Optics and Photonics Vol.1 No.4
We theoretically study the dynamics of water tetramer in intense femtosecond laser pulses with differentfrequencies. The simulations are carried out by incorporating the molecular dynamics method non-adiabaticallyinto the time-dependent local-density approximation (TDLDA-MD). Three typical scenarios of watertetramer including the normal vibration with enlarged OH bonds, free OH bonds breaking and the pureCoulomb explosion are presented by investigating the electronic and ionic dynamics. The result indicatesthat the ionization is enhanced and the corresponding fragmentation effect as well as the damping of thedipole moment are found more notably when increasing the laser frequency especially when the frequencyfalls in the resonant region of the absorption spectra. The study of the level depletion reveals that theratio of the emission amount from different levels can be controlled by changing the laser frequencyreferring to the Keldysh parameter.
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