Spatially twisted light with femtosecond temporal structure is of particular interest in strong-field physics and light–matter interactions.However,present femtosecond vortex sources exhibit limited power handling ca...Spatially twisted light with femtosecond temporal structure is of particular interest in strong-field physics and light–matter interactions.However,present femtosecond vortex sources exhibit limited power handling capabilities,and their amplification remains an ongoing challenge particularly for high-order orbital angular momentum(OAM)states due to several inherent technical difficulties.Here,we exploit a straightforward approach to directly amplify a femtosecond optical vortex(FOV,OAM=-8?)by using a two-stage single-crystal fiber(SCF)amplifier system without pulse stretching and compression in the time domain,delivering 23-W,163-fs pulses at a repetition rate of1 MHz.The spatial and temporal features are well-conserved during the amplification,as well as the high modal purity(>96%).The results indicate that the multi-stage SCF amplifier system is particularly suited for direct amplification of high-order FOVs.The generated high-power femtosecond OAM laser beams are expected to help reveal complex physical phenomena in light–matter interactions and pave the way for practical applications in attoscience,laser plasma acceleration,and high-dimension micromachining.展开更多
In this paper,we report on a wide wavelength tuning optical vortex carrying orbital angular momentum(OAM)of±?,from a thulium-doped yttrium aluminum perovskite(YAP)laser employing a birefringent filter.The OAM is ...In this paper,we report on a wide wavelength tuning optical vortex carrying orbital angular momentum(OAM)of±?,from a thulium-doped yttrium aluminum perovskite(YAP)laser employing a birefringent filter.The OAM is experimentally found to be well maintained during the whole wavelength tuning process.The Laguerre-Gaussian(LG_(0,+1))mode with a tuning range of 58 nm from 1934.8 to 1993.0 nm and LG0,-1mode with a range of 76 nm from 1920.4 to 1996.6 nm,are,respectively,obtained.This is,to the best of our knowledge,the first experimental implementation of wavelength tuning for a scalar vortex laser in the 2μm spectral range,as well as the broadest tuning range ever reported from the vortex laser cavity.Such a vortex laser with robust structure and straightforward wavelength tuning capability will be an ideal light source for potential applications in the field of optical communication with one additional degree of freedom.展开更多
We report on a high-efficiency,high-power tandem Ho:YAG single-crystal fiber(SCF)laser in-band pumped by a Tm-doped fiber laser at 1907 nm.In addition to the uniform heat distribution resulting from the large surface-...We report on a high-efficiency,high-power tandem Ho:YAG single-crystal fiber(SCF)laser in-band pumped by a Tm-doped fiber laser at 1907 nm.In addition to the uniform heat distribution resulting from the large surface-to-volume ratio of this fiber-like thin-crystal rod,the long gain region provided by the tandem layout of two SCFs enables high lasing efficiency and power handling capability.More than 100 W output power is achieved at 2.1μm,corresponding to a slope efficiency of 70.5%and an optical-to-optical efficiency of 67.6%.To the best of our knowledge,this is the highest output power and efficiency ever reported from SCF lasers in the 2-μm spectral range.展开更多
基金National Natural Science Foundation of China(52032009,62075090)。
文摘Spatially twisted light with femtosecond temporal structure is of particular interest in strong-field physics and light–matter interactions.However,present femtosecond vortex sources exhibit limited power handling capabilities,and their amplification remains an ongoing challenge particularly for high-order orbital angular momentum(OAM)states due to several inherent technical difficulties.Here,we exploit a straightforward approach to directly amplify a femtosecond optical vortex(FOV,OAM=-8?)by using a two-stage single-crystal fiber(SCF)amplifier system without pulse stretching and compression in the time domain,delivering 23-W,163-fs pulses at a repetition rate of1 MHz.The spatial and temporal features are well-conserved during the amplification,as well as the high modal purity(>96%).The results indicate that the multi-stage SCF amplifier system is particularly suited for direct amplification of high-order FOVs.The generated high-power femtosecond OAM laser beams are expected to help reveal complex physical phenomena in light–matter interactions and pave the way for practical applications in attoscience,laser plasma acceleration,and high-dimension micromachining.
基金financially supported by the National Natural Science Foundation of China(Nos.52032009 and 62075090)Natural Science Foundation of Jiangsu Province(Nos.SBK2019030177 and SBX2021020083)Postgraduates Innovation Program of Jiangsu Province(No.KYCX21_2619)。
文摘In this paper,we report on a wide wavelength tuning optical vortex carrying orbital angular momentum(OAM)of±?,from a thulium-doped yttrium aluminum perovskite(YAP)laser employing a birefringent filter.The OAM is experimentally found to be well maintained during the whole wavelength tuning process.The Laguerre-Gaussian(LG_(0,+1))mode with a tuning range of 58 nm from 1934.8 to 1993.0 nm and LG0,-1mode with a range of 76 nm from 1920.4 to 1996.6 nm,are,respectively,obtained.This is,to the best of our knowledge,the first experimental implementation of wavelength tuning for a scalar vortex laser in the 2μm spectral range,as well as the broadest tuning range ever reported from the vortex laser cavity.Such a vortex laser with robust structure and straightforward wavelength tuning capability will be an ideal light source for potential applications in the field of optical communication with one additional degree of freedom.
基金supported by the National Natural Science Foundation of China(Nos.62075090 and 52032009)。
文摘We report on a high-efficiency,high-power tandem Ho:YAG single-crystal fiber(SCF)laser in-band pumped by a Tm-doped fiber laser at 1907 nm.In addition to the uniform heat distribution resulting from the large surface-to-volume ratio of this fiber-like thin-crystal rod,the long gain region provided by the tandem layout of two SCFs enables high lasing efficiency and power handling capability.More than 100 W output power is achieved at 2.1μm,corresponding to a slope efficiency of 70.5%and an optical-to-optical efficiency of 67.6%.To the best of our knowledge,this is the highest output power and efficiency ever reported from SCF lasers in the 2-μm spectral range.
