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Qingdao, China

Zhu H.,Wenzhou University | Shao Z.,Wenzhou University | Wang H.,CRYSTECH Inc. | Duan Y.,Wenzhou University | And 3 more authors.
Optics Express | Year: 2014

We report efficient multi-Stokes Raman output of a KTiOAsO4 (KTA) crystal driven by a laser diode end-pumped acousto-optic Qswitched Nd:YAG laser. The Raman outputs of two x-cut KTA crystals, one with a length of 20 mm and the other one of 25-mm, were experimentally compared. Under an incident pump power of 10.9 W, a maximum output power of 1.12 W with a pulse width of 7.6 ns and a pulse repetition frequency of 15 kHz were obtained. The conversion efficiency and slope efficiency with respect to the incident diode pump power were 10.3% and 15.2%, respectively. The laser output contains multiple Raman Stokes lines with different spectral strengths that varied with the pump power. © 2014 Optical Society of America. Source


Zhu H.,Wenzhou University | Duan Y.,Wenzhou University | Feng Z.,Wenzhou University | Zhang G.,CAS Fujian Institute of Research on the Structure of Matter | And 4 more authors.
IEEE Photonics Technology Letters | Year: 2013

We propose an experimental technique for efficient 2-μm light generation based on the intracavity noncritical phase matching optical parametric oscillator (OPO). Intra-cavity pumped by a diode pumped actively Q-switched Nd YVO4 laser operating at 1.3 μm, we have achieved efficient 2093-nm signal beam emission making full use of noncritical phase matching KTA-OPO. At a diode pump power of 9.8 W and a Q-switching repetition rate of 30 kHz, a signal beam with a spectral linewidth of ∼ 1 nm and an average power of 1.01 W have been obtained, giving a diode pump power to signal power conversion efficiency of 10.3%. The short pulse width of ∼ 3.4 ns is achieved, which is much shorter than other approaches with Q-switched operation to generate 2-μm laser beams. © 1989-2012 IEEE. Source


You Z.,CAS Fujian Institute of Research on the Structure of Matter | Wang Y.,CAS Fujian Institute of Research on the Structure of Matter | Xu J.,CAS Fujian Institute of Research on the Structure of Matter | Zhu Z.,CAS Fujian Institute of Research on the Structure of Matter | And 3 more authors.
Optics Letters | Year: 2015

We reported on a diode-end-pumped single-longitudinalmode microchip laser using a 600-μm-thick Er:GGG crystal at ∼2.7 μm, generating a maximum output power of 50.8mWand the maximum pulsed energy of 0.306 mJ, with repetition rates of pumping light of 300, 200, and 100 Hz, respectively. The maximum slope efficiency of the laser was 20.1%. The laser was operated in a single-longitudinal mode centered at about 2704 nm with a FWHM of 0.42 nm. The laser had a fundamental beam profile and the beam quality parameter M2 was measured as 1.46. These results indicate that the Er:GGG microchip laser is a potential compact mid-infrared laser source. © 2015 Optical Society of America. Source


Ding S.,Yantai University | Wang M.,Yantai University | Wang S.,CRYSTECH Inc. | Zhang W.,Yantai University
Optics Express | Year: 2013

The compact LD end-pumped passively Q-switched c-cut Nd:YVO 4/Cr4+:YAG self-Raman laser is realized, and its output performance is investigated in detail. The maximum average output power at 1178nm is 800mW with the pulse repetition frequency of 44kHz and pulse width of 2.6ns, and the first Stokes conversion efficiency is 10.1%. The outputs of fundamental and first Stokes laser are found to be linearly polarized along the diagonals of the rectangular cross section of the c-cut Nd:YVO4 crystal, and the polarization mode competition is observed in the outputs of fundamental and first Stokes laser. © 2013 Optical Society of America. Source


Liu J.,Qingdao University | Dai Q.,Qingdao University | Han W.,Qingdao University | Wu K.,Shandong University | And 2 more authors.
IEEE Photonics Technology Letters | Year: 2013

We report on a very compact, highly efficient, passively Q-switched Yb:Gd3Ga5O12 crystal laser pumped at 935 nm by a diode, from which an average output power of 2.36 W at 1025 nm was produced at a pulse repetition rate of 7.7 kHz with a slope efficiency of 60%; the resulting pulse energy and duration were, respectively, 306 μJ and 1.7 ns, leading to a peak power amounting to 180 kW. © 1989-2012 IEEE. Source

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