In order to increase the power fraction of the central lobe in the coherent beam combination of lasers in an array,the effects of the distance factor of near-field distribution on far-field interference patterns are c...In order to increase the power fraction of the central lobe in the coherent beam combination of lasers in an array,the effects of the distance factor of near-field distribution on far-field interference patterns are calculated and demonstrated experimentally.An improved beam array of interwoven distribution is demonstrated to enable the power in the central lobe to reach 41%.An optimized mirror array is carefully designed to obtain a high duty ratio,which is up to 53.3% at a high power level.By using these optimized methods and designs,the passive phase locking of eight Yb-doped fiber amplifiers with ring cavities are obtained,and a pleasing interference pattern with 87% visibility is observed.The maximum coherent output power of the system is up to 1066 W.展开更多
We demonstrate a controllable dual-wavelength fiber laser which contains a master laser and a slave laser.The master laser is a kind of ring cavity laser which can be injected into by the slave laser.The output laser ...We demonstrate a controllable dual-wavelength fiber laser which contains a master laser and a slave laser.The master laser is a kind of ring cavity laser which can be injected into by the slave laser.The output laser wavelength is controlled by injected power of the slave laser;both single- and dual-wavelength operation can be achieved.Under free running,the master laser generates 1064 nm laser output.Here the slave laser is a 1072 nm fiber laser.The 1064nm and 1072 nm laser coexist in output spectrum for relatively low injected power.Dual-wavelength and power-ratio-tunable operation can be achieved.If the injected power of the slave laser is high enough,the 1064nm laser is extinguished automatically and there is only 1072nm laser output.展开更多
Array size scaling of passive coherent beam combination is explored theoretically. The Strehl ratio variation with wavelength is simulated in 4-, 9-, 16-, and 25-channel fiber arrays. The average Strehl ratio and phas...Array size scaling of passive coherent beam combination is explored theoretically. The Strehl ratio variation with wavelength is simulated in 4-, 9-, 16-, and 25-channel fiber arrays. The average Strehl ratio and phase error are calculated. The Strehl ratio is found to be near 100% for arrays with less than 5 fibers, but decreases significantly for larger arrays. These results are in good agreement with the recent experimental results.展开更多
基金Supported by the National Science and Technology Major Project(No 2010ZX04013)the National High Technology Research and Development Program of China under Grant No 2011AA030201,the Shanghai Rising-Star Program(No 09QB1401700)the Natural Science Foundation(No 60908011)。
文摘In order to increase the power fraction of the central lobe in the coherent beam combination of lasers in an array,the effects of the distance factor of near-field distribution on far-field interference patterns are calculated and demonstrated experimentally.An improved beam array of interwoven distribution is demonstrated to enable the power in the central lobe to reach 41%.An optimized mirror array is carefully designed to obtain a high duty ratio,which is up to 53.3% at a high power level.By using these optimized methods and designs,the passive phase locking of eight Yb-doped fiber amplifiers with ring cavities are obtained,and a pleasing interference pattern with 87% visibility is observed.The maximum coherent output power of the system is up to 1066 W.
基金Supported by the National High Technology Research and Development Program of China under Grant No 2014AA041901, the NSAF Foundation of National Natural Science Foundation of China under Grant No U1330134, and the National Natural Science Foundation of China under Grant No 61308024.
基金Supported by the National Science and Technology Major Project(No 2010ZX04013)the National High Technology Research and Development Program of China(No 2011AA030201),the National Natural Science Foundation of China(No 60908011)the Shanghai Rising-Star Program(No 09QB1401700).
文摘We demonstrate a controllable dual-wavelength fiber laser which contains a master laser and a slave laser.The master laser is a kind of ring cavity laser which can be injected into by the slave laser.The output laser wavelength is controlled by injected power of the slave laser;both single- and dual-wavelength operation can be achieved.Under free running,the master laser generates 1064 nm laser output.Here the slave laser is a 1072 nm fiber laser.The 1064nm and 1072 nm laser coexist in output spectrum for relatively low injected power.Dual-wavelength and power-ratio-tunable operation can be achieved.If the injected power of the slave laser is high enough,the 1064nm laser is extinguished automatically and there is only 1072nm laser output.
基金supported by the National Natural Science Foundation of China (No.60908011)the National High Technology Research and Development Program of China (No.2011AA030201)+1 种基金the Shanghai "Phosphor"Science Foundation,China (No.09QB1401700)the National Science and Technology Major Project (No.2010ZX04013)
文摘Array size scaling of passive coherent beam combination is explored theoretically. The Strehl ratio variation with wavelength is simulated in 4-, 9-, 16-, and 25-channel fiber arrays. The average Strehl ratio and phase error are calculated. The Strehl ratio is found to be near 100% for arrays with less than 5 fibers, but decreases significantly for larger arrays. These results are in good agreement with the recent experimental results.
