Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province

Shenzhen, China

Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province

Shenzhen, China
SEARCH FILTERS
Time filter
Source Type

Peng J.,Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province | Peng J.,Shenzhen University | Liu X.,Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province | Liu X.,Shenzhen University | And 7 more authors.
Optics Express | Year: 2016

In phase-measuring profilometry, the lens distortion of commercial projectors may introduce additional bending carrier phase and thus lead to measurement errors. To address this problem, this paper presents an adaptive fringe projection technique in which the carrier phase in the projected fringe patterns is modified according to the projector distortion. After projecting these adaptive fringe patterns, the bending carrier phase induced by the projector distortion is eliminated. Experimental results demonstrate this method to be effective and efficient in suppressing the projector distortion for phase-measuring profilometry. More importantly, this method does not need to calibrate the projector and system parameters, such as the distortion coefficients of the projector and the angle between the optical axes of projector and camera lenses. Hence, it has low computational complexity and enables us to improve the measurement precision for an arbitrary phase-measuring profilometry system. © 2016 Optical Society of America.


Wu J.,Shenzhen University | Yin X.,Shenzhen University | Wang W.,Shenzhen University | Wang W.,University of Science and Technology of China | And 6 more authors.
Applied Optics | Year: 2016

An all-fiber reflecting fluorescent temperature probe is proposed based on the simplified hollow-core photonic crystal fiber (SHC-PCF) filled with an aqueous CdSe/ZnS quantum dot solution. SHC-PCF is an excellent PCF used to fill liquid materials, which has low loss transmission bands in the visible wavelength range and enlarged core sizes. Both end faces of the SHC-PCF were spliced with multimode fiber after filling in order to generate a more stable and robust waveguide structure. The obtained temperature sensitivity dependence of the emission wavelength and the self-referenced intensity are 126.23 pm/°C and -0.007/°C in the temperature range of -10°C-120°C, respectively. © 2016 Optical Society of America.


Li Y.-H.,Shenzhen University | Li Y.-H.,Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province | Li Y.-H.,Xidian University | Liang R.-F.,Shenzhen University | And 12 more authors.
Wuli Xuebao/Acta Physica Sinica | Year: 2014

In a coherent anti-Stokes Raman scattering (CARS) microscope, when samples with different shapes and dimensions are excitated by collinearly introduced and tightly focused Gaussian beams, the microscopic structure will be determined by the spatial distributions of generated CARS signals. Therefore, we build a theoretical model for CARS signals from spherical sample under the tightly focused condition. The intensity and phase distributions of tightly focused linear polarization Gaussian beams are analyzed with vector wave equations. The vector wave equation of CARS signals is derived from Green's function. The far-field CARS radiation patterns of spherical scatters with different diameters are simulatively calculated. Theoretical analysis and simulative calculation results show that the intensities of forward and backward CARS signals from the small spherical sampler are similar. The images with high contrast can be obtained by backward detection method from an objective with a high numerical aperture. For big spherical samplers, intensities of CARS signals are greatly increased. The emission direction is mainly concentrated in a spatial angle. The forward CARS signals can be effectively collected by an objective with low numerical aperture. © 2014 Chinese Physical Society.

Loading Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province collaborators
Loading Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province collaborators