Ms. Jiyan Zhang Profile

Jiyan Zhang

at Xiamen Univ of Technology

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Publications (2)

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SPIE Journal Paper | 30 November 2017

Continuous-wave and passively Q-switched Nd:YVO₄ laser at 1085 nm

Hongyi Lin, Hong Liu, Xiaohua Huang, Jiyan Zhang

OE, Vol. 56, Issue 11, 116118, (November 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.11.116118

KEYWORDS: Crystals, Continuous wave operation, Q switched lasers, Coating, Pulsed laser operation, Output couplers, Chromium, Q switching, Bandpass filters, Neodymium lasers

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An admirable and efficient Nd:YVO4 laser at 1085 nm is demonstrated with a compact 35 mm plano-plano cavity. A chosen narrow bandpass filter with high-transmittance (HT) coating at 1064 nm (T=96%) and optimized part-reflection (PR) coating at 1085 nm (T=15%) is used as the output coupler. In the continuous-wave (CW) regime, the maximum output power reaches 3110 mW at the pump power of 11.41 W. Based on a Cr:YAG crystal with initial-transmittance of 91%, the first passively Q-switched Nd:YVO4 laser at 1085 nm is achieved. When the pump power is changed from the threshold of 4.50 to 6.08 W, the dual-wavelength lines at 1064 and 1085 nm are generated simultaneously. However, at the pump power of above 6.08 W, the single-wavelength line at 1085 nm is achieved. The largest output power, the highest peak power, and the narrowest pulse width are 1615 mW, 878 W and 26.2 ns, respectively.

Proceedings Article | 19 October 2016 Paper

Short-focus and ultra-wide-angle lens design in wavefront coding

Jiyan Zhang, Yuanqing Huang, Feibing Xiong

Proceedings Volume 10154, 101540I (2016) https://doi.org/10.1117/12.2245818

KEYWORDS: Lens design, Wavefronts

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Wavefront coding (WFC) is a hybrid technology designed to increase depth of field of conventional optics. The goal of our research is to apply this technology to the short-focus and ultra-wide-angle lens which suffers from the aberration related with large field of view (FOV) such as coma and astigmatism. WFC can also be used to compensate for other aberration which is sensitive to the FOV. Ultra-wide-angle lens has a little depth of focus because it has small F number and short-focus. We design a hybrid lens combing WFC with the ultra-wide-angle lens. The full FOV and relative aperture of the final design are up to170° and 1/1.8 respectively. The focal length is 2 mm. We adopt the cubic phase mask (CPM) in the design. The conventional design will have a wide variation of the point spread function (PSF) across the FOV and it is very sensitive with the variation of the FOV. The new design we obtain the PSF is nearly invariant over the whole FOV. But the result of the design also shows the little difference between the horizontal and vertical length of the PSF. We analyze that the CPM is non-symmetric phase mask and the FOV is so large, which will generate variation in the final image quality. For that reason, we apply a new method to avoid that happened. We try to make the rays incident on the CPM with small angle and decrease the deformation of the PSF. The experimental result shows the new method to optimize the CPM is fit for the ultra-wide-angle lens. The research above will be a helpful instruction to design the ultra-wide-angle lens with WFC.

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