Time filter

Source Type

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.


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.


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.


Zhang H.T.,Center for Photonics and Electronics | Liu M.,Center for Photonics and Electronics | Yan P.,Center for Photonics and Electronics | Gong M.L.,Center for Photonics and Electronics | And 3 more authors.
Laser Physics | Year: 2012

A Super-luminescent Diode (SLD) seeded all fiber cascaded pulsed laser system is reported. The signal line width is 8 nm confined by spectrum filers between stages, much wider than Laser Diode (LD) seeded laser. The wide spectrum of the seed source gives a good opportunity to get higher stimulated brillouin scattering threshold than LD seeded laser. The system emits up to 50 W pulses at a wavelength of 1064 nm and a repetition rate of 20 kHz with peak power 250 kW and beam quality M2 < 1.8. No SBS or SRS are observed and its output power is limited only by available pump power. © Pleiades Publishing, Ltd., 2012.


Xiao Q.,Center for Photonics and Electronics | Zhang H.,Center for Photonics and Electronics | Yan P.,Center for Photonics and Electronics | Wang Y.,Center for Photonics and Electronics | And 2 more authors.
Laser Physics | Year: 2012

In this paper, we report a monolithic fiber side-pumping coupler that allows for very large mode area double clad fiber designs. This coupler is constituted of a multi-mode pump fiber and a double clad fiber (DCF). The pump power is coupled to the DCF through the side of DCF. The pump coupling peak power of 163.7 W @ 560 μs with the coupling efficiency of 98.0% is achieved, and the signal coupling energy of 10 mJ @ 10 ns (&1 MW @ 10 ns) with the coupling efficiency of 96.3% is obtained, when the core diameter of the DCF is 100 μm. Furthermore, this side-pumping coupler is successfully applied to a high peak power pulse all-fiber laser with the output energy of over 10 mJ @ 10 ns. © Pleiades Publishing, Ltd., 2012.


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.


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.


Zheng C.,Center for Photonics and Electronics | Zhang H.T.,Center for Photonics and Electronics | Cheng W.Y.,Center for Photonics and Electronics | Liu M.,Center for Photonics and Electronics | And 2 more authors.
Laser Physics | Year: 2012

We report on an all fiber Master Oscillator Power Amplifier (MOPA) structured pulsed-pumped fiber-amplifier seeded by laser diode and modulated by current with an output of several nanojoule energy at 100 Hz repetition rate. To suppress ASE, pulse-pumped technology was adopted in four stages of amplification. By means of this technology, repetition could be adjusted freely without change of pump current which is different from continuous pump. 80 μJ output was achieved in 18 ns pulses in the 15 μJ amplification stage. Moreover, we achieved over 1.2 mJ/pulse with pulses of 10 ns between 1 Hz to 100 Hz repetition in the 30 μm core amplification stage with output beam quality of M 2 = 1.4. Energy was limited by launched pump power. © Pleiades Publishing, Ltd., 2012.

Loading Center for Photonics and Electronics collaborators
Loading Center for Photonics and Electronics collaborators