Entity

Time filter

Source Type


Bai Y.,Northwest University, China | Bai Y.,Shaanxi Engineering Technology Research Center for Solid State Lasers and Application | Chen X.M.,Northwest University, China | Guo J.X.,Northwest University, China | And 5 more authors.
Laser Physics | Year: 2012

We report an efficient operation of a kilohertz nanosecond extracavity KGd(WO 4) 2 (KGW) crystal Raman yellow laser, which is pumped by a 532 nm lasers based on pulse laser diode (LD) side-pumped ceramic Nd : YAG, BBO electro-optical Q-switched and LBO crystal extracavity frequency doubling. With the 5 W, 10 ns and 1 kHz output power pumped at 532 nm, we obtained 2.58 W, 7.4 ns, 1 kHz second Stokes Raman laser output at 579.54 nm for 768 cm -1 Raman shift of KGW crystal, corresponding to a conversion efficiency of 51.4%. By changing the KGW crystal orientation, we further obtained 3.18 W, 7.8 ns, 1 kHz Raman pulses at 588.33 nm for 901 cm -1 Raman shift, corresponding to a conversion efficiency of 63.3%. The beam quality factors M 2 of 579.54 and 588.33 nm were (M 2 x-579.54 = 5.829, M 2 y-579.54 = 6.336) and (M 2 x-588.33 = 6.405, M 2 y-588.33 = 6.895), respectively. © Pleiades Publishing, Ltd., 2012. Source


Bai Y.,Northwest University, China | Bai Y.,Shaanxi Engineering Technology Research Center for Solid State Lasers and Application | Chen X.M.,Northwest University, China | Chen X.M.,Shaanxi Engineering Technology Research Center for Solid State Lasers and Application | And 6 more authors.
Laser Physics | Year: 2012

355 nm UV laser was obtained with a pulse width of less than 5 ns and a peak power at megawatt level by adopting the 808 nm pulse laser diode (LD) side-pumped ceramic Nd:YAG and BBO crystal electro-optical Q-switched. The single-pulse energy was measured to be 24.3 mJ with 4.86 ns pulse width and 5.11 MW peak power at a repetition rate of 1Hz under a 120 A pump current. Using a volume of beam splitting mirrors, wavelength outputs at 1064, 532, and 355 nm pulse laser was obtained simultaneously with a respective average output power of 656.6, 357.1, and 260.5 mW, the beam quality factor M 2 are (M x-1064 2 = 5.83, M y-1064 2 = 5.61), (M x-532 2 = 4.25, = M y-532 2 4.08) and (M x-355 2 = 6.32, M y-355 2 = 6.15), corresponding to a conversion efficiency at 11% from 1064 to 355 nm. © Pleiades Publishing, Ltd., 2012. Source


Deng J.,Northwest University, China | Deng J.,Shaanxi Engineering Technology Research Center for Solid State Lasers and Application | Deng J.,China Institute of Technology | Chen H.,Northwest University, China | And 15 more authors.
Journal of Optics (United Kingdom) | Year: 2015

We report a new method for obtaining a stable single-frequency Yb-doped fiber laser by introducing a graphene film into a fiber loop mirror combined with a simple linear cavity. The graphene film acts as a saturable absorber so as to form a dynamic absorbing grating in the 3 dB fiber loop. This grating is like a narrow-band filter for discriminating and selecting longitudinal modes. Moreover, we use a polarization controller in the linear resonator to suppress the spatial hole burning effect. The maximum output power is 16mW at 1 064 nm with a pump power of 110 mW at 975 nm, the slope efficiency is 15%, and the SNR is about 60 dB. To the best of our knowledge, this is the first demonstration of a 1 064 nm single-frequency laser based on a linear cavity with a graphene-loop mirror filter. © 2015 IOP Publishing Ltd. Source


Lu B.,Northwest University, China | Lu B.,Shaanxi Engineering Technology Research Center for Solid State Lasers and Application | Chen H.,Northwest University, China | Chen H.,Shaanxi Engineering Technology Research Center for Solid State Lasers and Application | And 8 more authors.
Laser Physics | Year: 2013

We demonstrate a passively Q-switched Tm3+-doped all-fiber laser (TDFL) at around 2 μm with a graphene-based saturable absorber (SA). The graphene is prepared by the reduction of graphite oxide (GO), deposited on the fiber core and inserted into a linear cavity as the passive Q-switch. A 793 nm laser diode (LD) is used as the pump source, with a maximum power of 200 mW. A maximum output power of ∼33.5 mW is obtained at a pump power of 200 mW, with a high optical conversion efficiency of about 17%. The corresponding single pulse energy is 260 nJ and the repetition rate is 128 kHz. © 2013 Astro Ltd. Source


Lu B.,Northwest University, China | Lu B.,Shaanxi Engineering Technology Research Center for Solid State Lasers and Application | Chen H.,Northwest University, China | Chen H.,Shaanxi Engineering Technology Research Center for Solid State Lasers and Application | And 8 more authors.
Optics and Laser Technology | Year: 2013

A Laser diode (LD) side-pumped ceramic Nd:YAG laser was developed to achieve dual wavelength output at 532 nm and 660 nm, based on LiB 3O5 (LBO) intracavity frequency doubling with the method of β-BaB2O4 (BBO) electro-optical Q-switching (EO Q-switching). In the experiment, a T-shaped cavity is designed for laser oscillate to reach the maximum output power of 8.32 W at 532 nm and 4.2 W at 660 nm simultaneously; and also, the pulse widths could reach to 88.6 ns at 532 nm and 96 ns at 660 nm with the repetition rate of 10 kHz. The beam quality factors (M2) could be measured as Mx2=4.36, My2=4.78 at 532 nm and Mx2=5.46, My2=5.83 at 660 nm. Both the power instabilities of the two output wavelengths are less than 2% in 10 h measured at every 1 h. All of the EO Q-switching technique, oscillation cavity design and laser gain media, used in this work, illustrate a valid way to develop a dual-wavelength laser with high output peak power. © 2013 Elsevier Ltd. Source

Discover hidden collaborations