Qingdao, China
Qingdao, China

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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.


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.


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.


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.


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.


Xu J.-L.,CAS Fujian Institute of Research on the Structure of Matter | Ji Y.-X.,Anhui University of Technology | Wang Y.-Q.,CAS Fujian Institute of Research on the Structure of Matter | You Z.-Y.,CAS Fujian Institute of Research on the Structure of Matter | And 2 more authors.
Optics Express | Year: 2014

A novel self-Q-switched and orthogonally polarized dualwavelength laser has been investigated with Yb3+-doped CGB disordered crystals. By slightly inclining output coupler to introduce the Fresnel loss, we realized simultaneously dual-wavelength laser operation at 1052.6 nm in E//b polarization and 1057.7 nm in E//c polarization with a frequency difference of 1.38 THz. Self-Q-switched pulse generation was observed in this free-running laser, originating from the nonlinear reabsorption effect of Yb:CGB as well as the strong storage of inversion population induced by the long excited-state lifetime (∼1 ms). Pulse duration of 287 ns was obtained with an output average power of 416 mW and a repetition rate of 35 kHz. The self-Q-switching effect increased the peak power by 100 times the average power. This very simple laser, free from the complexity and high-cost of additional intracavity polarization modulator and Q-switcher, may be applied for constructing miniature, integrated and portable laser system. © 2014 Optical Society of America.


Duan Y.M.,CAS Fujian Institute of Research on the Structure of Matter | Zhang G.,CAS Fujian Institute of Research on the Structure of Matter | Zhang Y.J.,Wenzhou University | Jin Q.L.,Wenzhou University | And 2 more authors.
Laser Physics | Year: 2011

Intra-cavity sum frequency generation (SFG) of c-cut Nd:YVO 4 self-Raman laser was investigated for the first time. A 4 × 4 × 10 mm 3 KTP crystal with a type-II phase-matching cutting angle (? = 83.4°, f = 0°) was used for SFG between the fundamental light at 1066 nm and first-Stokes light at 1178 nm. The laser system with different curvature radii of output couplers and different pulse repetition frequencies were investigated. At a pump power of 14 W and pulse repetition frequency of 20 kHz, the average output power of yellow-green laser at 560 nm up to 840 mW was achieved, corresponding to a slope efficiency of 7.6% and a conversion efficiency of 6% with respect to diode pump power. © Pleiades Publishing, Ltd., 2011.


Duan Y.M.,Wenzhou University | Duan Y.M.,CAS Fujian Institute of Research on the Structure of Matter | Zhu H.Y.,Wenzhou University | Zhang G.,CAS Fujian Institute of Research on the Structure of Matter | And 2 more authors.
Optics Communications | Year: 2012

We present a high-power 1.53 μm laser based on intracavity KTA-OPO driven by diode-end-pumped acousto-optical Q-switched YVO 4/Nd: YVO 4 composite. The composite crystal was utilized for reducing the thermal effect, and the mode mismatch compensating OPO cavity was designed for efficient OPO conversion. The output power of eye-safe laser at 1535 nm was up to 4.4 W with the pump power of 27 W, corresponding to a diode-to-signal conversion efficiency of 16.3%. To our knowledge, this is the highest output power in diode-end-pumped circumstances. In the experiment, the strong yellow light generated by Raman conversion and frequency doubling in the KTA crystal was observed. © 2012 Elsevier B.V. All rights reserved.


Qiu G.,Shandong University | Qiu G.,CRYSTECH Inc. | Huang H.T.,Shandong University | Zhang B.T.,Shandong University | And 3 more authors.
Laser Physics | Year: 2010

Based on the gray tracking resistance (GTR) KTP crystals, the performance of a high efficient and compact intracavity frequency doubling 532 nm laser was investigated. The gray tracking test indicated that the KTP used in our experiment had good resistance to the gray tracking. The absorption coefficient of this GTR-KTP at 1064 and 532 nm were measure to be 5 × 10 -3%/cm and 0.2%/cm, respectively. The maximum average output power of 40.6 W at 532 nm was obtained at the repetition frequency of 10 kHz for the 10 mm long GTR-KTP, which corresponded to 22.6% pump-to-green conversion efficiency. The effective conversion efficiency from the Q-switched 1064 nm to the green power at 10 kHz repetition rate was as high as 86.4%. © 2010 Pleiades Publishing, Ltd.


Zhu H.Y.,CAS Fujian Institute of Research on the Structure of Matter | Zhu H.Y.,University of Chinese Academy of Sciences | Duan Y.M.,CAS Fujian Institute of Research on the Structure of Matter | Duan Y.M.,University of Chinese Academy of Sciences | And 8 more authors.
Laser Physics Letters | Year: 2010

A high power eye-safe optical parametric oscillator driven by the LD end-pumped Nd:YAlO3 laser was demonstrated based on a non-critically phase-matched KTiOAsO4 crystal. The mode mismatch compensating resonator was adopted for efficient OPO conversion. The maximum output power of 2.3 W at 1562 nm was achieved at the pulse repetition frequency of 20 kHz. The conversion efficiency between the fundamental light and the signal light was up to 62%, which was much higher than other relative reports. © 2010 by Astro Ltd.

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