Shenzhen Key Laboratory of Laser Engineering

Shenzhen, China

Shenzhen Key Laboratory of Laser Engineering

Shenzhen, China

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Huang G.,Shenzhen University | Huang G.,Shenzhen Key Laboratory of Laser Engineering | Yu Y.,Shenzhen Key Laboratory of Laser Engineering | Yu Y.,Shenzhen University | And 6 more authors.
Optics Express | Year: 2013

A diode-end-pumped simultaneously Q-switched and modelocked self-Raman YVO4/Nd:YVO4/YVO4 laser at first-Stokes wavelength of 1175.9 nm was demonstrated. The shortest mode-locked pulse width of the laser was obtained to be ~23.57 ps, with the corresponding timebandwidth product of ~0.51. The maximum average output power, the highest pulse energy and the highest peak power were obtained to be 1.83 W, 6.1 μJ and 220 kW, respectively. The nonlinear Raman process improved the Q-switched mode-locking performance of the Stokes pulses. ©2013 Optical Society of America.


Ou Z.,Shenzhen University | Ou Z.,Shenzhen Key Laboratory of Laser Engineering | Yu Y.,Shenzhen Key Laboratory of Laser Engineering | Yu Y.,Shenzhen University | And 11 more authors.
Optics Express | Year: 2013

A novel, simple, and compact optical fiber directional bending vector sensor based on Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated. The device consists of a piece of seven-core photonic crystal fiber (PCF) sandwiched between two single mode fibers (SMFs) with a lateral offset splicing joint that covering two cores of PCF. Bending sensitivity of the seven-core PCF based MZI is changed by an axial rotation angle, which shows its capacity for recognizing positive and negative directions. Within a curvature range of ?7.05 m?1 to 7.05 m?1, the calculated bending sensitivities of two resonant central wavelengths with opposite fiber orientations are 1.232 nm/m?1 and 1.174 nm/m?1, respectively. This novel MZI is formed by invoking interference between the LP01-like supermode and other higher order supermodes in the core, which leads to insensitive to ambient refractive index (ARI). We have also investigated the transmission characteristics of the sensor with the temperature change. © 2013 Optical Society of America.


Du C.,Shenzhen University | Du C.,Shenzhen Key Laboratory of Laser Engineering | Xie X.,Shenzhen University | Xie X.,Shenzhen Key Laboratory of Laser Engineering | And 8 more authors.
Applied Physics B: Lasers and Optics | Year: 2014

A diode-end-pumped composite YVO4/Nd:YVO4/YVO 4 crystal self-Raman laser at the second-Stokes wavelength of 1,764 nm is demonstrated. The maximum average output power of second-Stokes radiation was up to 0.99 W at a pump power of 34 W and a pulse repetition frequency of 20 kHz, corresponding to an optical conversion efficiency of 2.9 %. The highest peak power and the shortest pulse duration were 21.5 kW and 1.92 ns, respectively. © 2013 Springer-Verlag Berlin Heidelberg.


Du C.,Shenzhen University | Du C.,Shenzhen Key Laboratory of Laser Engineering | Guo Y.,Shenzhen University | Guo Y.,Shenzhen Key Laboratory of Laser Engineering | And 6 more authors.
Laser Physics Letters | Year: 2013

A diode-end-pumped acousto-optical Q-switched composite YVO 4/Nd:YVO4/YVO4 crystal self-Raman laser at the second-Stokes wavelength of 1314 nm is demonstrated. The maximum average output power at 1314 nm was obtained to be 1.4 W with the corresponding optical conversion efficiency of 4.1%. The shortest pulse width, the maximum pulse energy and the highest peak power were measured to be 1.1 ns, 40 μJ and 28.7 kW, respectively. © 2013 Astro Ltd.


Huang Q.,Shenzhen University | Huang Q.,Shenzhen Key Laboratory of Laser Engineering | Yu Y.,Shenzhen Key Laboratory of Laser Engineering | Yu Y.,Shenzhen University | And 10 more authors.
Photonic Sensors | Year: 2014

A long period fiber grating (LPFG) fabricated upon the all-solid photonic bandgap fiber by CO2 laser irradiation was investigated, and its resonance wavelength was at 1335.76 nm with a modulation depth of 15 dB and a 3-dB bandwidth of 2.6 nm. We studied its strain, temperature, and index sensor characteristics, the strain sensitivity of 0.992 pm/με was obtained by using linear fit, and the relationship between the refractive index and wavelength obeyed the distribution of quadratic function. Also, we demonstrated its temperature response was relatively insensitive (21.51 pm/°C). © The Author(s) 2013.


Zheng J.,Shenzhen University | Zheng J.,Shenzhen Key Laboratory of Laser Engineering | Yan P.,Shenzhen University | Yan P.,Shenzhen Key Laboratory of Laser Engineering | And 10 more authors.
Optics Communications | Year: 2013

Mach-Zehnder interferometer strain sensors made from pieces of photonic crystal fiber spliced to standard single mode fibers are fabricated with different lengths. High strain sensitivity of 2.1 pm/με at 1550 nm is achieved with the length of 45 mm. The interference is induced by the core mode and the high order core mode due to the special air hole structure of PCF, which is independent of the surrounding refractive index. The temperature sensitivity (∼13.24 pm/°C) is relatively low. This structure is good in avoiding cross sensitivity in strain measurement and is fabricated with a simple process and low cost. © 2013 Elsevier B.V.


Yu Y.,Shenzhen Key Laboratory of Laser Engineering | Yu Y.,Shenzhen University | Chen X.,Shenzhen Key Laboratory of Laser Engineering | Chen X.,Shenzhen University | And 7 more authors.
Applied Physics B: Lasers and Optics | Year: 2015

We demonstrate a novel and compact fiber-probe pressure sensor based on a micro-Fabry–Perot interferometer (FPI). The device is fabricated by splicing both ends of a short-section simplified hollow-core photonic crystal fiber (SHC-PCF) with single-mode fibers. Then, a microchannel is drilled by a femtosecond laser micromachining in the SHC-PCF to allow air to diffuse in. The pressure sensing mechanism is based on the dependence of the air refractive index on pressure. We use both theory and experiment to investigate the sensing characteristics. A micro-FPI with a length of 272 μm demonstrates a pressure sensitivity of 4.071 nm/MPa at 1580 nm and a low-temperature sensitivity of 1.1 pm/°C at atmospheric pressure. We further study the temperature cross sensitivity of the sensor under different pressures. The sensor also shows strong stability and good reversibility, and may be potentially used in pressure sensing applications. © 2015, Springer-Verlag Berlin Heidelberg.


Wang Z.,Shenzhen University | Wang Z.,Shenzhen Key Laboratory of Laser Engineering | Du C.,Shenzhen University | Du C.,Shenzhen Key Laboratory of Laser Engineering | And 4 more authors.
Optics and Laser Technology | Year: 2010

A method to characterize the thermal lens in a Nd:GdVO4 self-Raman laser is presented. The thermal focal length was measured to be as short as 180 mm with a self-Raman laser output power of 0.95 W. For comparison, the thermal focal lengths in the cases of fundamental operation and first-Stokes operation were measured experimentally, indicating that the heat generated in the SRS process exacerbated the thermal loading of the Nd:GdVO4 crystal. © 2010 Elsevier Ltd. All rights reserved.


Wang Z.,Shenzhen University | Wang Z.,Shenzhen Key Laboratory of Laser Engineering | Du C.,Shenzhen University | Du C.,Shenzhen Key Laboratory of Laser Engineering | And 4 more authors.
Optics and Laser Technology | Year: 2010

A laser diode pumped actively Q-switched Nd:GdVO4 self-Raman laser operating at 1173 nm is presented. The maximum output power was 2.26 W at an incident pump power of 18 W, with the corresponding optical conversion efficiency of 12.6%. Two different resonator configurations were investigated in order to achieve high output power and efficiency. © 2009.


Wang Z.C.,Shenzhen University | Wang Z.C.,Shenzhen Key Laboratory of Laser Engineering | Du C.L.,Shenzhen University | Du C.L.,Shenzhen Key Laboratory of Laser Engineering | And 4 more authors.
Laser Physics | Year: 2010

LD-pumped actively Q-switched Nd:YVO4 self-Raman laser is presented. The maximum average output power of the self-Raman laser at 1173.6 nm was obtained to be 2.21 W at the incident pump power of 18 W and the pulse repetition frequency (PRF) of 30 kHz, with the corresponding optical conversion efficiency of 12.28%. © 2010 Pleiades Publishing, Ltd.

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