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Liu X.,CAS Academy of Opto Electronics | Fan Z.,CAS Academy of Opto Electronics | Shi Z.,CAS Academy of Opto Electronics | Ma Y.,CAS Academy of Opto Electronics | And 2 more authors.
Optics Express | Year: 2016

In this work, dual-core antiresonant hollow core fibers (AR-HCFs) are numerically demonstrated, based on our knowledge, for the first time. Two fiber structures are proposed. One is a composite of two single-core nested nodeless AR-HCFs, exhibiting low confinement loss and a circular mode profile in each core. The other has a relatively simple structure, with a whole elliptical outer jacket, presenting a uniform and wide transmission band. The modal couplings of the dual-core AR-HCFs rely on a unique mechanism that transfers power through the air. The core separation and the gap between the two cores influence the modal coupling strength. With proper designs, both of the dual-core fibers can have low phase birefringence and short modal coupling lengths of several centimeters. © 2016 Optical Society of America. Source


Yan Y.,CAS Academy of Opto Electronics | Yan Y.,Beijing GK Laser Technology Co. | Fan Z.-W.,CAS Academy of Opto Electronics | Niu G.,Beijing GK Laser Technology Co. | And 2 more authors.
Chinese Physics Letters | Year: 2012

A 46-W laser diode end-pumped amplifier is demonstrated by using a SESAM passively mode-locked oscillator and a compact LD stack end-pumped slab amplifier. For the oscillator, a 5-W picosecond mode-locked laser with a repetition frequency of 79 MHz is obtained with beam quality factors of M 2 < 1.3. A beam shaping system made up of cylindrical lens is designed according to different sizes of the active medium in both directions, and a plane-plane cavity is used in the amplifier for high efficiency. At the absorbed pumping power of 174 W, the highest output power of 46 W is obtained with the slope efficiency of 29.5%. The beam quality factors M 2 in both directions are measured to be 1.43 and 1.76, respectively. © 2012 Chinese Physical Society and IOP Publishing Ltd. Source


Xu L.,Beijing Institute of Technology | Zhang H.,Beijing Institute of Technology | Mao Y.,Beijing Institute of Technology | Yan Y.,Beijing GK Laser Technology Co. | And 2 more authors.
Applied Optics | Year: 2012

We demonstrated a laser-diode, end-pumped picosecond amplifier. With effective shaping of the seed laser, we achieved 73 W amplified laser output at the pump power of 255 W, and the optical-optical efficiency was about 28%. The beam propagation factors M2 measured at the output power of 60 W in the horizontal direction and the vertical direction were 1.5 and 1.4, respectively. © 2012 Optical Society of America. Source


Zhu J.,Xidian University | Wang Z.,CAS Institute of Physics | Wang Q.,CAS Institute of Physics | Zhang Z.,CAS Institute of Physics | And 4 more authors.
Chinese Optics Letters | Year: 2012

We experimentally demonstrate a diode-pumped passively mode-locked femtosecond laser with Yb3+-doped yttrium lanthanum oxide ceramic. Mode-locking is achieved by using a semiconductor saturable absorber mirror, and intracavity dispersion is compensated by a pair of SF6 prisms. Laser pulses as short as 357 fs at a central wavelength of 1 075 nm are obtained. The maximum average output power is 670 mW under 4.5 W of pumping power with a slope efficiency of 20%. To the best of our knowledge, this is the shortest pulse generated from Yb-doped yttrium lanthanum oxide ceramic lasers with a sub-500 fs pulse duration. © 2012 Chinese Optics Letters. Source


Zhu L.,CAS Shanghai Institute of Optics and fine Mechanics | Zhou C.,CAS Shanghai Institute of Optics and fine Mechanics | Wu T.,CAS Shanghai Institute of Optics and fine Mechanics | Jia W.,CAS Shanghai Institute of Optics and fine Mechanics | And 5 more authors.
Applied Optics | Year: 2010

We present a femtosecond off-axis digital holography for investigating the dynamic reversible surface change of a metal film induced by femtosecond laser pulses with fluences near the ablation threshold. A reflection Michelson interferometer (RMI) and a transmission Mach-Zehnder interferometer (TMZI) are integrated in the same setup for recording digital holograms. The RMI is used to measure the laserinduced surface deformation of the metal film, while the TMZI is used to analyze the refraction index change of the metal film induced by the femtosecond laser pulses. Experimental results show that both surface modification and refraction index change of chromium metal film can be observed when femtosecond laser pulses are below and above the ablation threshold. Based on the experimental results, the physical processes of the metal induced by femtosecond laser pulses are given qualitatively. © 2010 Optical Society of America. Source

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