A pulsed pumped Yb-doped double-clad fiber (DCF) master-oscillator power amplifier (MOPA) at low repetition rate is reported. Seeded by a passive Q-switched Nd:YAG microchip laser, the fiber amplifier can generate 167...A pulsed pumped Yb-doped double-clad fiber (DCF) master-oscillator power amplifier (MOPA) at low repetition rate is reported. Seeded by a passive Q-switched Nd:YAG microchip laser, the fiber amplifier can generate 167-kW peak-power and 0.83-ns duration pulses at 200-Hz repetition rate. Because of the pulsed pump approach, the amplified spontaneous emission (ASE) and the spurious lasing between pulses are well avoided, and the repetition rate can be set freely from single-shot to 1 kHz. Peak power scaling limitations that arise from the fiber facet damage are discussed.展开更多
Optically pumped terahertz （THz） lasers with high pulse repetition frequency are designed. Such a laser includes two parts： the optically pumping laser and the THz laser. The structures of the laser are described a...Optically pumped terahertz （THz） lasers with high pulse repetition frequency are designed. Such a laser includes two parts： the optically pumping laser and the THz laser. The structures of the laser are described and analyzed. The rate equations for the pulsed THz laser are given. The kinetic process and laser pulse waveform for this kind of laser are numerically calculated based on the theory of rate equations. The theoretical results give a helpful guide to the research of such lasers.展开更多
We develop a compact and high-energy Nd：YAG slab laser system consisting of an oscillator and an amplifier for space applications. The oscillator is a diode-side-pumped electro-optically Q-switched slab laser with a ...We develop a compact and high-energy Nd：YAG slab laser system consisting of an oscillator and an amplifier for space applications. The oscillator is a diode-side-pumped electro-optically Q-switched slab laser with a cross-Porro resonator. The KD＊P Pockels cell with a low driving voltage of 950 V is used to polarization output coupling. The amplifier is a Nd：YAG zigzag slab pumped at bounces. The maximum output pulse energy of 341 m3 with 13 ns pulse duration is obtained from the system at the repetition rate of 20 Hz and the beam quality factors are M2=3.1 and M2=3.5. The beam pointing stabilities of the laser system are 3.05μrad in the X-direction and 3.99 grad in the Y-direction, respectively.展开更多
A 1.88μm Ba（N3）2-based stimulated Raman scattering（SRS） laser pumped by a potassium-titanylphosphate-based optical parametric oscillator（OPO） laser is presented.Under the pumping energy of a130 mJ 1064 nm Q-swi...A 1.88μm Ba（N3）2-based stimulated Raman scattering（SRS） laser pumped by a potassium-titanylphosphate-based optical parametric oscillator（OPO） laser is presented.Under the pumping energy of a130 mJ 1064 nm Q-switched Nd：YAG laser,a 40 mJ 1.57μm laser is achieved;the maximum output energy of the 1.88μm Raman laser reaches 7.5 mJ with a pulse duration of 5.3 ns at repetition rates of 10 Hz,and the corresponding total optical conversion efficiency is about 5.8%.The combination of the SRS and OPO techniques significantly extends the wavelength from 1.064 to 1.57μm（OPO） and then demonstrates Stokes-shifting to 1.88μm（SRS）.展开更多
We experimentally demonstrate a femtosecond optical parametric oscillator （OPO） synchronously pmnped by a home-made solid-state mode-locking Yb：YCOB laser, which is capable of laser pulse as short as 102 fs and ave...We experimentally demonstrate a femtosecond optical parametric oscillator （OPO） synchronously pmnped by a home-made solid-state mode-locking Yb：YCOB laser, which is capable of laser pulse as short as 102 fs and average power of 620 mW at the central wavelength of 1052 nm. By using a periodically poled lithium niobate with tuning of the grating periods from 28.5 to 31.5μm as the nonlinear gain crystal, tunable femtosecond pulses from 1444 to 1683 nm are realized by conveniently adjusting the OPO cavity length with 76.8 MHz repetition rate. The maximum average output power is 152 mW at 1568 nm, corresponding to an idler power of 75 mW at 3197 nm as well as 36.6% total extraction efficiency.展开更多
In this Letter, ceramic Nd：YAG is charactrizeby electron spin resonance （ESR） measurements. The ESR results indicate that the polycrystalline ceramic Nd：YAG has barely native defects and impurity ions localization...In this Letter, ceramic Nd：YAG is charactrizeby electron spin resonance （ESR） measurements. The ESR results indicate that the polycrystalline ceramic Nd：YAG has barely native defects and impurity ions localization defects, compared to an Nd：YAG crystal with the same Nd doping concentration, due to its density structure by sintering in a vacuum pure raw material and additives during the fabrication. It may conclude that the high quality ceramic Nd：YAG may have greater ability on optical characteristic, mechanical performance, and laser damage than that of the crystals, which is a promising candidate to use on laser diode-pumped solid-state lasers.展开更多
文摘A pulsed pumped Yb-doped double-clad fiber (DCF) master-oscillator power amplifier (MOPA) at low repetition rate is reported. Seeded by a passive Q-switched Nd:YAG microchip laser, the fiber amplifier can generate 167-kW peak-power and 0.83-ns duration pulses at 200-Hz repetition rate. Because of the pulsed pump approach, the amplified spontaneous emission (ASE) and the spurious lasing between pulses are well avoided, and the repetition rate can be set freely from single-shot to 1 kHz. Peak power scaling limitations that arise from the fiber facet damage are discussed.
基金supported by the National Natural Science Foundation of China (No. 60668016)the New Century Foundation for Outstanding Talents from the Ministry of Education of China (No. NCET-07-0240)
文摘Optically pumped terahertz （THz） lasers with high pulse repetition frequency are designed. Such a laser includes two parts： the optically pumping laser and the THz laser. The structures of the laser are described and analyzed. The rate equations for the pulsed THz laser are given. The kinetic process and laser pulse waveform for this kind of laser are numerically calculated based on the theory of rate equations. The theoretical results give a helpful guide to the research of such lasers.
文摘We develop a compact and high-energy Nd：YAG slab laser system consisting of an oscillator and an amplifier for space applications. The oscillator is a diode-side-pumped electro-optically Q-switched slab laser with a cross-Porro resonator. The KD＊P Pockels cell with a low driving voltage of 950 V is used to polarization output coupling. The amplifier is a Nd：YAG zigzag slab pumped at bounces. The maximum output pulse energy of 341 m3 with 13 ns pulse duration is obtained from the system at the repetition rate of 20 Hz and the beam quality factors are M2=3.1 and M2=3.5. The beam pointing stabilities of the laser system are 3.05μrad in the X-direction and 3.99 grad in the Y-direction, respectively.
基金supported by the National Science Foundation of China(Nos.11127901 and 11134010)the Shanghai Sailing Program(No.15YF1413500)
文摘A 1.88μm Ba（N3）2-based stimulated Raman scattering（SRS） laser pumped by a potassium-titanylphosphate-based optical parametric oscillator（OPO） laser is presented.Under the pumping energy of a130 mJ 1064 nm Q-switched Nd：YAG laser,a 40 mJ 1.57μm laser is achieved;the maximum output energy of the 1.88μm Raman laser reaches 7.5 mJ with a pulse duration of 5.3 ns at repetition rates of 10 Hz,and the corresponding total optical conversion efficiency is about 5.8%.The combination of the SRS and OPO techniques significantly extends the wavelength from 1.064 to 1.57μm（OPO） and then demonstrates Stokes-shifting to 1.88μm（SRS）.
基金partly supported by the National Natural Science Foundation of China(No.61205130)the National Key Basic Research Program of China(No.2013CB922402)the National Key Scientific Instruments Development Program of China(No.2012YQ120047)
文摘We experimentally demonstrate a femtosecond optical parametric oscillator （OPO） synchronously pmnped by a home-made solid-state mode-locking Yb：YCOB laser, which is capable of laser pulse as short as 102 fs and average power of 620 mW at the central wavelength of 1052 nm. By using a periodically poled lithium niobate with tuning of the grating periods from 28.5 to 31.5μm as the nonlinear gain crystal, tunable femtosecond pulses from 1444 to 1683 nm are realized by conveniently adjusting the OPO cavity length with 76.8 MHz repetition rate. The maximum average output power is 152 mW at 1568 nm, corresponding to an idler power of 75 mW at 3197 nm as well as 36.6% total extraction efficiency.
文摘In this Letter, ceramic Nd：YAG is charactrizeby electron spin resonance （ESR） measurements. The ESR results indicate that the polycrystalline ceramic Nd：YAG has barely native defects and impurity ions localization defects, compared to an Nd：YAG crystal with the same Nd doping concentration, due to its density structure by sintering in a vacuum pure raw material and additives during the fabrication. It may conclude that the high quality ceramic Nd：YAG may have greater ability on optical characteristic, mechanical performance, and laser damage than that of the crystals, which is a promising candidate to use on laser diode-pumped solid-state lasers.
