In order to combine LED lighting with optical communication system well, an effective coding
design plugged in a time interval which is selected through theoretical calculation is proposed in the
paper. In this way a stable environment for illumination will be provided and the brightness will be
improved. Results of the experiment verify that the coding design is effective.
Two-photon induced fluorescence (TPIF) is the most common method to measure the TPA cross-section, this method
has advantages of high detection sensitivity based on fluorescence measurement, and also can eliminate the influences of other nonlinear beam propagation effects. However, this method requires the assumption that the fluorescence collection efficiency is equal in every measurement, this is hardly impossible for conventional setup. In this paper, the physical model of the fluorescence collecting system is established based on the experimental setup of TPIF. The simulation results indicate that the traditional fluorescence collecting device brings some unavoidable errors because of the collection coefficients are different in different times. Against to the drawback of the conventional fluorescence collection device, an improved recommendation which uses integrating sphere is presented. The analysis shows that the measurement accuracy of the two-photo absorption cross-section can be improved as the collection coefficients are same in different times.
A new naked eyes stereoscopic display optical system for multi-users was proposed in this paper, different from the
conventional naked eyes stereoscopic display monitors with sophistication technology and bad uniformity of
illumination. According to the binocular parallax technology, Fresnel lens and polaroid sheet were chosen to focus the
rays on the observers' eyes. Freeform lens were used in this system to enhance illumination uniformity of pictures and
efficiency of the system. The results of simulation showed that the users can obtain stereoscopic effect at their each
places, uniformity of illumination on LCD was above 0.6. Therefore, this system had a simple and compact structure,
and the quality of pictures users obtain was better than system without freeform lenses.
Both cost and performance are important factors used to evaluate the manufacture methods for diffractive optical
element (DOE). The diamond turning technology has many advantages of processing diffractive optical element
compared with other methods. There are special errors existing in this process which can decrease the performance and
limit the application field of the DOE. In this paper, the errors caused by diamond turning technology are analyzed and
the calculation results are given.
A dual-waveband infrared re-imaging system has been designed with less lens number and short system length. The
properties of re-imaging system to correct chromatic aberration have been researched. The main parameters of this system
include F number, focal length, diameter, dual waveband, and imaging plane size are 2,000 mm, 200 mm, 3-5 μm /8-12
μm, and 9.3 mm × 12.4 mm, respectively. After design the average modulation value of all fields of view is 0.60 at 10lp/mm,
and the difference between limited diffractive system and actual system is less than 0.3. The ray aberration has been
corrected at the center wavelength 5 μm. The focal length varies with wavelength around 400 mm, and gets 400 mm exactly
at 4 μm and 10 μm.
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