Classic interferometry was commonly adopted to realize ultrafast phase imaging using pulsed lasers;however, the reference beam required makes the optical structure of the imaging system very complex, and high temporal...Classic interferometry was commonly adopted to realize ultrafast phase imaging using pulsed lasers;however, the reference beam required makes the optical structure of the imaging system very complex, and high temporal resolution was reached by sacrificing spatial resolution. This study presents a type of single-shot ultrafast multiplexed coherent diffraction imaging technique to realize ultrafast phase imaging with both high spatial and temporal resolutions using a simple optical setup, and temporal resolution of nanosecond to femtosecond scale can be realized using lasers of different pulse durations. This technique applies a multiplexed algorithm to avoid the data division in space domain or frequency domain and greatly improves the spatial resolution. The advantages of this proposed technique on both the simple optical structure and high image quality were demonstrated by imaging the generation and evaluating the laser-induced damage and accompanying phenomenon of laser filament and shock wave at a spatial resolution better than 6.96 μm and a temporal resolution better than 10 ns.展开更多
A three-wavelength coherent-modulation-imaging(CMI)technique is proposed to simultaneously measure the fundamental,second and third harmonics of a laser driver in one snapshot.Laser beams at three wavelengths(1053 nm,...A three-wavelength coherent-modulation-imaging(CMI)technique is proposed to simultaneously measure the fundamental,second and third harmonics of a laser driver in one snapshot.Laser beams at three wavelengths(1053 nm,526.5 nm and 351 nm)were simultaneously incident on a random phase plate to generate hybrid diffraction patterns,and a modified CMI algorithm was adopted to reconstruct the complex amplitude of each wavelength from one diffraction intensity frame.The validity of this proposed technique was verified using both numerical simulation and experimental analyses.Compared to commonly used measurement methods,this proposed method has several advantages,including a compact structure,convenient operation and high accuracy.展开更多
The properties of a series of phase measurement techniques,including interferometry,the Hartmann–Shack wavefront sensor,the knife-edge technique,and coherent diffraction imaging,are summarized and their performance i...The properties of a series of phase measurement techniques,including interferometry,the Hartmann–Shack wavefront sensor,the knife-edge technique,and coherent diffraction imaging,are summarized and their performance in high power laser applications is compared.The advantages,disadvantages,and application ranges of each technique are discussed.展开更多
基金National Natural Science Foundation of China(11875308,6190031304,61975218)Scientific and Innovative Action Plan of Shanghai(19142202600)+1 种基金Strategic Priority Research Program of the Chinese Academy of Sciences(XDA25020202,XDA25020203)Youth Innovation Promotion Association of the Chinese Academy of Sciences(2018282)。
文摘Classic interferometry was commonly adopted to realize ultrafast phase imaging using pulsed lasers;however, the reference beam required makes the optical structure of the imaging system very complex, and high temporal resolution was reached by sacrificing spatial resolution. This study presents a type of single-shot ultrafast multiplexed coherent diffraction imaging technique to realize ultrafast phase imaging with both high spatial and temporal resolutions using a simple optical setup, and temporal resolution of nanosecond to femtosecond scale can be realized using lasers of different pulse durations. This technique applies a multiplexed algorithm to avoid the data division in space domain or frequency domain and greatly improves the spatial resolution. The advantages of this proposed technique on both the simple optical structure and high image quality were demonstrated by imaging the generation and evaluating the laser-induced damage and accompanying phenomenon of laser filament and shock wave at a spatial resolution better than 6.96 μm and a temporal resolution better than 10 ns.
基金supported by the National Natural Science Foundation of China (NSFC) (Nos. 61827816, 61675215, and 11875308)the Scientific Instrument Developing Project of the Chinese Academy of Sciences (No. YJKYYQ20180024)the Shanghai Sailing Program (No. 18YF1426600)
文摘A three-wavelength coherent-modulation-imaging(CMI)technique is proposed to simultaneously measure the fundamental,second and third harmonics of a laser driver in one snapshot.Laser beams at three wavelengths(1053 nm,526.5 nm and 351 nm)were simultaneously incident on a random phase plate to generate hybrid diffraction patterns,and a modified CMI algorithm was adopted to reconstruct the complex amplitude of each wavelength from one diffraction intensity frame.The validity of this proposed technique was verified using both numerical simulation and experimental analyses.Compared to commonly used measurement methods,this proposed method has several advantages,including a compact structure,convenient operation and high accuracy.
基金supported by the One Hundred Talents Project of the Chinese Academy of Sciences,China (Grant No.1204341-XR0)
文摘The properties of a series of phase measurement techniques,including interferometry,the Hartmann–Shack wavefront sensor,the knife-edge technique,and coherent diffraction imaging,are summarized and their performance in high power laser applications is compared.The advantages,disadvantages,and application ranges of each technique are discussed.
