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Hong H.,Center for Photonics and Electronics | Liu Q.,Center for Photonics and Electronics | Huang L.,Center for Photonics and Electronics | Gong M.,Center for Photonics and Electronics
Applied Physics Express | Year: 2012

An efficient all-solid-state 355nm ultraviolet laser based on an 888nm pumped master-oscillator power-amplifier (MOPA) system is presented. Due to the high beam quality of the fundamental wave being superior to 1.15 (M 2) under all pump powers and pulse repetition frequencies (PRFs), the UV laser has the advantage of being able to operate continuously from zero to maximum power. The maximum green and UV output powers were 45.9W at 50 kHz and 24.3W at 65 kHz with the corresponding conversion efficiencies from IR-to-green and IR-to-UV of 66.0% and 34.1%, respectively © 2012 The Japan Society of Applied Physics. Source


Chen H.,Center for Photonics and Electronics | Liu Q.,Center for Photonics and Electronics | Yan P.,Center for Photonics and Electronics | Xiao Q.,Center for Photonics and Electronics | Gong M.,Center for Photonics and Electronics
Applied Physics Express | Year: 2012

At a high repetition rate of 1 MHz, the maximum 32.1W TEM ∞ mode ultraviolet (UV) laser is generated by harmonically converting the output of semiconductor-diode-seeded four-cascaded fiber amplifiers. The master-oscillator-fiber-power-amplifier (fiber-MOPA) configuration based IR source exhibits high power with excellent spatial, temporal, spectral, and polarizing performances. The novel single-pass frequency tripling scheme, beginning with the noncritical phase matching (PM) for second-harmonic generation and the subsequent noncollinear PM for thirdharmonic generation, is used to minimize the spatial walk-off effect. Due to the overall system optimization, the optic-optic conversion efficiency from IR to UV is scaled up to 51.5%. © 2012 The Japan Society of Applied Physics. Source


Wang L.,Center for Photonics and Electronics | Liu Q.,Center for Photonics and Electronics | Ji E.,Center for Photonics and Electronics | Chen H.,Center for Photonics and Electronics | Gong M.,Center for Photonics and Electronics
Applied Optics | Year: 2014

A high repetition rate optical parametric oscillator (OPO) generating an idler laser with a wavelength as long as 4.0 μm at 200 and 400 kHz was demonstrated in this paper. The OPO was pumped by a master oscillator power amplifier structure fiber laser with excellent characteristics. The pump pulse from the fiber laser had a steep leading edge, which was theoretically proved to improve the OPO's performance, compared with the Gaussian pump pulse. A homemade periodically poled magnesium-oxide-doped lithium niobate crystal with a grating period of 29 μm was employed in our experiment. By optimizing the resonator, 2.75 and 1.67 W idler lasers were finally achieved at repetition rates as high as 200 and 400 kHz, respectively, with a wavelength as long as 4.0 μm. The conversion efficiencies were 12.03% and 7.31%, respectively. © 2014 Optical Society of America. Source


Zhang H.T.,Center for Photonics and Electronics | Zheng C.,Center for Photonics and Electronics | Yan P.,Center for Photonics and Electronics | Gong M.L.,Center for Photonics and Electronics | And 2 more authors.
Laser Physics Letters | Year: 2012

We report a wide bandwidth with full width at half maximum (FWHM) of about 10 nm pulsed all-fiber master oscillator power amplifier (MOPA) incoherent source emitting 13.91 mJ pulses (1.16 MW peak power) for 12 ns duration at the repetition rate lower than 100 Hz. In order to increase the efficiency and suppress amplified spontaneous emission (ASE), multi-stage pulse pump technology is applied. And different pump width and signal duration amplification characteristics were measured. A totally about 90 dB gain is obtained. And this system is possibly utilized in fiber-based inertial fusion laser driver. © 2012 by Astro, Ltd. Source


Liu M.,Center for Photonics and Electronics | Zhang H.T.,Center for Photonics and Electronics | Yan P.,Center for Photonics and Electronics | Gong M.L.,Center for Photonics and Electronics | And 2 more authors.
Laser Physics | Year: 2012

A special slow motion dynamic equations are presented especially adapt to the fiber laser analyze in which a long working cycle simulation and acute state changing are both needed. It can greatly save the calculation time while keep the output result relatively accurate. Then the dynamics of nanosecond high energy low repetition rate pulsed fiber amplifier is analyzed which indicate that most energy is wasted by means of self emission between pulses and the amplified self emission (ASE) is no longer the main cause of energy depletion with proper pulsed pump. Hence, unless a relatively large input seed source is used, the light conversion efficiency of a low repetition rate pulsed laser is usually much lower than the quantum efficiency even with a pulsed pump. © Pleiades Publishing, Ltd., 2012. Source

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