A new approach to target development for laboratory astrophysics experiments at high-power laser facilities is presented.With the dawn of high-power lasers,laboratory astrophysics has emerged as a field,bringing insig...A new approach to target development for laboratory astrophysics experiments at high-power laser facilities is presented.With the dawn of high-power lasers,laboratory astrophysics has emerged as a field,bringing insight into physical processes in astrophysical objects,such as the formation of stars.An important factor for success in these experiments is targetry.To date,targets have mainly relied on expensive and challenging microfabrication methods.The design presented incorporates replaceable machined parts that assemble into a structure that defines the experimental geometry.This can make targets cheaper and faster to manufacture,while maintaining robustness and reproducibility.The platform is intended for experiments on plasma flows,but it is flexible and may be adapted to the constraints of other experimental setups.Examples of targets used in experimental campaigns are shown,including a design for insertion in a high magnetic field coil.Experimental results are included,demonstrating the performance of the targets.展开更多
As the key part for energy amplification of high-power laser systems,disk amplifiers must work in an extremely clean environment.Different from the traditional cleanliness control scheme of active intake and passive e...As the key part for energy amplification of high-power laser systems,disk amplifiers must work in an extremely clean environment.Different from the traditional cleanliness control scheme of active intake and passive exhaust(AIPE),a new method of active exhaust and passive intake(AEPI)is proposed in this paper.Combined with computational fluid dynamics(CFD)technology,through the optimization design of the sizes,shapes,and locations of different outlets and inlets,the turbulence that is unfavorable to cleanliness control is effectively avoided in the disk amplifier cavity during the process of AEPI.Finally,the cleanliness control of the cavity of the disk amplifier can be realized just by once exhaust.Meanwhile,the micro negative pressure environment in the amplifier cavity produced during the exhaust process reduces the requirement for sealing.This method is simple,time saving,gas saving,efficient,and safe.It is also suitable for the cleanliness control of similar amplifiers.展开更多
As optical parametric chirped pulse amplification has been widely adopted for the generation of extreme intensity laser sources,nonlinear crystals of large aperture are demanded for high-energy amplifiers.Yttrium calc...As optical parametric chirped pulse amplification has been widely adopted for the generation of extreme intensity laser sources,nonlinear crystals of large aperture are demanded for high-energy amplifiers.Yttrium calcium oxyborate(YCa_(4)O(BO_(3))_(3),YCOB)is capable of being grown with apertures exceeding 100 mm,which makes it possible for application in systems of petawatt scale.In this paper,we experimentally demonstrated for the first time to our knowledge,an ultra-broadband non-collinear optical parametric amplifier with YCOB for petawatt-scale compressed pulse generation at 800 nm.Based on the SG-II 5 PW facility,amplified signal energy of approximately 40 J was achieved and pump-to-signal conversion efficiency was up to 42.3%.A gain bandwidth of 87 nm was realized and supported a compressed pulse duration of 22.3 fs.The near-field and wavefront aberration represented excellent characteristics,which were comparable with those achieved in lithium triborate-based amplifiers.These results verified the great potential for YCOB utilization in the future.展开更多
基金Additional funding was provided by the Student Grant Competition of CTU(No.SGS22/180/OHK4/3T/14)the Ministry of Education,Youth&Sports of the Czech Republic(No.LM2018114)+1 种基金the Horizon 2020 project Laserlab-Europe V(No.871124)This work was funded by the Helmholtz Association(No.VHNG-1338).
文摘A new approach to target development for laboratory astrophysics experiments at high-power laser facilities is presented.With the dawn of high-power lasers,laboratory astrophysics has emerged as a field,bringing insight into physical processes in astrophysical objects,such as the formation of stars.An important factor for success in these experiments is targetry.To date,targets have mainly relied on expensive and challenging microfabrication methods.The design presented incorporates replaceable machined parts that assemble into a structure that defines the experimental geometry.This can make targets cheaper and faster to manufacture,while maintaining robustness and reproducibility.The platform is intended for experiments on plasma flows,but it is flexible and may be adapted to the constraints of other experimental setups.Examples of targets used in experimental campaigns are shown,including a design for insertion in a high magnetic field coil.Experimental results are included,demonstrating the performance of the targets.
基金supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA25020101)。
文摘As the key part for energy amplification of high-power laser systems,disk amplifiers must work in an extremely clean environment.Different from the traditional cleanliness control scheme of active intake and passive exhaust(AIPE),a new method of active exhaust and passive intake(AEPI)is proposed in this paper.Combined with computational fluid dynamics(CFD)technology,through the optimization design of the sizes,shapes,and locations of different outlets and inlets,the turbulence that is unfavorable to cleanliness control is effectively avoided in the disk amplifier cavity during the process of AEPI.Finally,the cleanliness control of the cavity of the disk amplifier can be realized just by once exhaust.Meanwhile,the micro negative pressure environment in the amplifier cavity produced during the exhaust process reduces the requirement for sealing.This method is simple,time saving,gas saving,efficient,and safe.It is also suitable for the cleanliness control of similar amplifiers.
基金partially supported by the Shanghai Natural Science Foundation(No.20ZR1464400)the National Natural Science Foundation of China(NSFC)(Nos.12074399,12204500 and 12004403)+4 种基金the Key Projects of Intergovernmental International Scientific and Technological Innovation Cooperation(No.2021YFE0116700)the Shanghai Sailing Program(No.22YF1455300)the International Partnership Program of the Chinese Academy of Sciences(No.181231KYSB20170022)the Chinese Academy of Sciences(Nos.CXJJ-21S015,XDA25020311 and XDA25020105)NSAF(No.U1930126)
文摘As optical parametric chirped pulse amplification has been widely adopted for the generation of extreme intensity laser sources,nonlinear crystals of large aperture are demanded for high-energy amplifiers.Yttrium calcium oxyborate(YCa_(4)O(BO_(3))_(3),YCOB)is capable of being grown with apertures exceeding 100 mm,which makes it possible for application in systems of petawatt scale.In this paper,we experimentally demonstrated for the first time to our knowledge,an ultra-broadband non-collinear optical parametric amplifier with YCOB for petawatt-scale compressed pulse generation at 800 nm.Based on the SG-II 5 PW facility,amplified signal energy of approximately 40 J was achieved and pump-to-signal conversion efficiency was up to 42.3%.A gain bandwidth of 87 nm was realized and supported a compressed pulse duration of 22.3 fs.The near-field and wavefront aberration represented excellent characteristics,which were comparable with those achieved in lithium triborate-based amplifiers.These results verified the great potential for YCOB utilization in the future.
