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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. Source


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. Source


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. Source


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. Source


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. Source

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