The high harmonic generation(HHG)by few-cycle laser pulses is essential for research in strong-field solid-state physics.Through comparison of high harmonic spectra of solids generated by laser pulses with varying dur...The high harmonic generation(HHG)by few-cycle laser pulses is essential for research in strong-field solid-state physics.Through comparison of high harmonic spectra of solids generated by laser pulses with varying durations,we discovered that lasers with good dispersion compensation are capable of producing a broad spectrum of high harmonics.As the pulse duration is further compressed,several interference peaks appear in the broad spectrum.Moreover,we conducted simulations using the semiconductor Bloch equation,considering the effect of Berry curvature,to better understand this process.Our work provides a valuable approach for studying HHG by few-cycle laser pulses in solid materials,expanding the application of HHG in attosecond physics.展开更多
Isolated attosecond pulses(IAPs)are generated via applying amplitude gating on high-order harmonic generation driven by carrier-envelope phase stabilized 5.2 fs pulses with 0.5 mJ pulse energy at 770 nm central wavele...Isolated attosecond pulses(IAPs)are generated via applying amplitude gating on high-order harmonic generation driven by carrier-envelope phase stabilized 5.2 fs pulses with 0.5 mJ pulse energy at 770 nm central wavelength at the Synergetic Extreme Condition User Facility.A continuum ranging from 70 to 100 eV that supports sub-100-attosecond pulse is extracted by Zr foil and Mo/Si multilayer mirror.We demonstrate the characterization of the IAP.The retrieved pulse duration is 86attoseconds.The developed attosecond laser beamline with repetition rate up to 10 kHz is available for users to conduct attosecond photoelectron spectroscopy researches with a capability of coincidence measurement.展开更多
High harmonic generation(HHG)delivering attosecond pulse duration with photon energy in the extreme ultraviolet spectral range has been demonstrated as a robust table-top coherent light source,allowing for the observa...High harmonic generation(HHG)delivering attosecond pulse duration with photon energy in the extreme ultraviolet spectral range has been demonstrated as a robust table-top coherent light source,allowing for the observation and manipulation of ultrafast process within the shortest time window ever made by humans.The past decade has witnessed the rapid progress of HHG from a variety of solid targets and its application for photoemission spectroscopy in condensed matter.In this article,we review the HHG in solids and the understanding of the underlying physics of HHG,which allows all-optical band structure reconstruction.We also introduce combinations of HHG source and photoemission spectroscopy,such as angular-resolved photoemission spectroscopy and photoemission electron microscopy.With the capacity of exploring a wide momentum space and high temporal resolution,the extension of attosecond science to the field of condensed matter physics will lead to new insights into the fundamental ultrafast dynamics in novel quantum materials.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.91850209 and 11974416)。
文摘The high harmonic generation(HHG)by few-cycle laser pulses is essential for research in strong-field solid-state physics.Through comparison of high harmonic spectra of solids generated by laser pulses with varying durations,we discovered that lasers with good dispersion compensation are capable of producing a broad spectrum of high harmonics.As the pulse duration is further compressed,several interference peaks appear in the broad spectrum.Moreover,we conducted simulations using the semiconductor Bloch equation,considering the effect of Berry curvature,to better understand this process.Our work provides a valuable approach for studying HHG by few-cycle laser pulses in solid materials,expanding the application of HHG in attosecond physics.
基金supported by the Synergic Extreme Condition User Facility(SECUF),the National Natural Science Foundation of China(Nos.91850209,12034020,92150103,61690221,and 12174435)the National Key R&D Program of China(Nos.2022YFA1604200 and 2017YFB0405202)。
文摘Isolated attosecond pulses(IAPs)are generated via applying amplitude gating on high-order harmonic generation driven by carrier-envelope phase stabilized 5.2 fs pulses with 0.5 mJ pulse energy at 770 nm central wavelength at the Synergetic Extreme Condition User Facility.A continuum ranging from 70 to 100 eV that supports sub-100-attosecond pulse is extracted by Zr foil and Mo/Si multilayer mirror.We demonstrate the characterization of the IAP.The retrieved pulse duration is 86attoseconds.The developed attosecond laser beamline with repetition rate up to 10 kHz is available for users to conduct attosecond photoelectron spectroscopy researches with a capability of coincidence measurement.
基金supported by the National Natural Science Foundation of China(Grant Nos.91850209,12174435 and 12034020)the National Key Research and Development Program of China(2017YFB0405202,2018YFB1107200).
文摘High harmonic generation(HHG)delivering attosecond pulse duration with photon energy in the extreme ultraviolet spectral range has been demonstrated as a robust table-top coherent light source,allowing for the observation and manipulation of ultrafast process within the shortest time window ever made by humans.The past decade has witnessed the rapid progress of HHG from a variety of solid targets and its application for photoemission spectroscopy in condensed matter.In this article,we review the HHG in solids and the understanding of the underlying physics of HHG,which allows all-optical band structure reconstruction.We also introduce combinations of HHG source and photoemission spectroscopy,such as angular-resolved photoemission spectroscopy and photoemission electron microscopy.With the capacity of exploring a wide momentum space and high temporal resolution,the extension of attosecond science to the field of condensed matter physics will lead to new insights into the fundamental ultrafast dynamics in novel quantum materials.
