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Jiang W.,Guangdong Higher Education Institutes | Zhu S.,Guangdong Higher Education Institutes | Zhu S.,Jinan University | Li Z.,Guangdong Higher Education Institutes | And 7 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2015

By using Nd:YAG/Cr:YAG/YAG composite crystal as gain media, a passively Q-switched LD side-pumped laser with high average output power, working at 1064 nm, is set up. The 1064 nm laser output power increases linearly with the pumping light power and the maximum average output power of 83.68 W is observed. With the help of a KTP nonlinear crystal, 532 nm laser pulses with the corresponding pulse width of 210 ns and the repetition rate of 21.2 kHz are obtained under the maximum LD pumping light of 187.5 W. The average output power of 532 nm laser is 27.2 W. The singlepulse energy is 1.28 mJ and the peak power is 6.1 kW. The optical-to-optical conversion efficiency of LD pumping light to 532 nm output light is 14.72%. © 2015 SPIE. Source

Yin H.,Guangdong Higher Education Institutes | Yin H.,Jinan University | Zhu S.,Guangdong Higher Education Institutes | Zhu S.,Jinan University | And 14 more authors.
Optik | Year: 2016

According to the own nature and its related optical characteristics of Nd:YVO4 crystal, a set of compact all-solid-state laser system at 457 nm was designed. At the same time the parameters of the temperature control system and the resonant cavity were also optimized. Based on the realization of Nd:YVO4 laser crystal operation at 914 nm wavelength, 457 nm laser output were obtained by intracavity frequency doubling with LBO and BIBO crystal. The M2 factor was 1.38 and 1.57 by the LBO and BIBO intracavity frequency doubling experiments. Under the pump power of 24.3 W, the output power of 2.34 W and 1.56 W is obtained, respectively, with the same experimental condition. The optical-to-optical efficiency is 9.74% and 6.45%. © 2016 Elsevier GmbH. Source

Zhu S.,Jinan University | Su K.,Jinan University | Liu Y.,Jinan University | Yin H.,Jinan University | And 7 more authors.
Biomedical Optics Express | Year: 2015

We construct a microscopic hyperspectral imaging system to distinguish between normal and cancerous gastric cells. We study common transmission-spectra features that only emerge when the samples are dyed with hematoxylin and eosin (H&E) stain. Subsequently, we classify the obtained visible-range transmission spectra of the samples into three zones. Distinct features are observed in the spectral responses between the normal and cancerous cell nuclei in each zone, which depend on the pH level of the cell nucleus. Cancerous gastric cells are precisely identified according to these features. The average cancer-cell identification accuracy obtained with a backpropagation algorithm program trained with these features is 95%. © 2015 Optical Society of America. Source

Jiang W.,Jinan University | Liu Y.,Jinan University | Chen W.,CAS Fujian Institute of Research on the Structure of Matter | Zhu S.,Jinan University | And 4 more authors.
Applied Optics | Year: 2015

We experimentally demonstrate efficient passively Q-switched bulk lasers with composite Yb:YAG/Cr4-:YAG/YAG crystals at 1030 nm for the first time, to the best of our knowledge. The output performance was investigated based on different initial transmissions (T0) of Cr4-:YAG and different transmissions (Toc) of output coupler. Stable passive Q-switching with composite crystal of T0- 85% and output coupler of Toc- 32% resulted in the maximum average output power of 2.55 W, with corresponding pulse duration of 11.5 ns and repetition rate of 5.71 kHz. The pulse energy and peak power were 446.25 μJ and 38.8 kW, respectively. © 2015 Optical Society of America. Source

Jiang W.,Guangdong Higher Education Institutes | Jiang W.,Jinan University | Zhu S.,Guangdong Higher Education Institutes | Zhu S.,Jinan University | And 13 more authors.
Applied Optics | Year: 2014

Compact passively Q-switched YVO4first Stokes Raman laser and its frequency doubling laser were reported by using Nd3+:YAG/Cr4+:YAG composite crystal for what is believed to be the first time. Nanosecond lasers at 1176 and 588 nm were obtained. At the incident pump power of 7.84 W, the average output power at 1176 nm was 423 mW with a pulse width of 1.32 ns and the pulse repetition frequency (PRF) of 13.7 kHz. By applying a KTP crystal, an intracavity second harmonic generation (SHG) laser at 588 nm also was realized. With an incident pump power of 8.95 W, we obtained 105.3 mW average output power of a yellow laser corresponding to the pulse width of 4.95 ns and the PRF of 10.75 kHz. In addition, the composite crystal efficiently compacted the resonant cavity. © 2014 Optical Society of America. Source

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