High-quality neodymium-doped yttrium aluminum garnet(Nd:YAG)transparent ceramic(4.0 mole percent)was fabricated by a solid-state reaction method and vacuum sintering.The microstructure,optical transmittance,spectral p...High-quality neodymium-doped yttrium aluminum garnet(Nd:YAG)transparent ceramic(4.0 mole percent)was fabricated by a solid-state reaction method and vacuum sintering.The microstructure,optical transmittance,spectral properties and laser performance were investigated.The average grain size of the sample is about 10 mm.The transmittance of a 2.8-mm thick sample reaches 79.5%at the laser wavelength of 1064 nm.The highest absorption peak is centered at 807 nm and the absorption coefficient is 13.9 cm^(-1).The absorption coefficient at the laser wavelength is 0.2 cm^(-1).The main emission peak is at 1064 nm and the fluorescence lifetime is 102 ms.A laser diode(808 nm)whose maximum output is about 1000 mW was used as a pump source and an endpumped laser experiment was performed.The 1064 nm-CW-laser output was obtained and the threshold is 733 mW.With 998 mW of maximum absorbed pump power,a laser output of 17 mW is obtained with a slope efficiency of 6.1%.展开更多
Proposed is a novel optical pulse compression technique based on high-doped erbium fiber amplifier and standard single-mode fiber(SMF). We used the amplifier with the erbium ion concentration of 6.3×10-3 to ampli...Proposed is a novel optical pulse compression technique based on high-doped erbium fiber amplifier and standard single-mode fiber(SMF). We used the amplifier with the erbium ion concentration of 6.3×10-3 to amplify a hyperbolic secant pulse from a regeneratively mode-locked fiber laser. The central wavelength, pulsewidth and peak power of the pulse are 1 550 nm, 12.5 ps and 3 mW, respectively. Then the amplified pulse with peak power level corresponding to a higher-order soliton is compressed when it propagates through a 3-km-long single-mode fiber. Studied are the compressed pulses under different pump powers and fiber lengths. The results show that it can get a narrower pulse, and solve the difficulty that pulses at low power can not be compressed directly in the fiber. And the construct is compact.展开更多
基金supported by the Key Basic Research Project of Science and Technology of Shanghai(Grant No.07DJ14001)the Applied Basic Research Programs of Science and Technology Commission Foundation of Shanghai(Grant Nos.05DZ22005 and 06DZ11417)the Innovation Project of Shanghai Institute of Ceramics,Chinese Academy of Sciences and the Fund of National Engineering Research Center for Optoelectronic Crystalline Materials(Grant No.2005DC105003).
文摘High-quality neodymium-doped yttrium aluminum garnet(Nd:YAG)transparent ceramic(4.0 mole percent)was fabricated by a solid-state reaction method and vacuum sintering.The microstructure,optical transmittance,spectral properties and laser performance were investigated.The average grain size of the sample is about 10 mm.The transmittance of a 2.8-mm thick sample reaches 79.5%at the laser wavelength of 1064 nm.The highest absorption peak is centered at 807 nm and the absorption coefficient is 13.9 cm^(-1).The absorption coefficient at the laser wavelength is 0.2 cm^(-1).The main emission peak is at 1064 nm and the fluorescence lifetime is 102 ms.A laser diode(808 nm)whose maximum output is about 1000 mW was used as a pump source and an endpumped laser experiment was performed.The 1064 nm-CW-laser output was obtained and the threshold is 733 mW.With 998 mW of maximum absorbed pump power,a laser output of 17 mW is obtained with a slope efficiency of 6.1%.
基金National Natural Science Foundation of China(60507001 60477022 06YFGPGX08500)
文摘Proposed is a novel optical pulse compression technique based on high-doped erbium fiber amplifier and standard single-mode fiber(SMF). We used the amplifier with the erbium ion concentration of 6.3×10-3 to amplify a hyperbolic secant pulse from a regeneratively mode-locked fiber laser. The central wavelength, pulsewidth and peak power of the pulse are 1 550 nm, 12.5 ps and 3 mW, respectively. Then the amplified pulse with peak power level corresponding to a higher-order soliton is compressed when it propagates through a 3-km-long single-mode fiber. Studied are the compressed pulses under different pump powers and fiber lengths. The results show that it can get a narrower pulse, and solve the difficulty that pulses at low power can not be compressed directly in the fiber. And the construct is compact.
