A newly-designed femtosecond KBe${}_2$BO${}_3$F${}_2$ device with pulse duration down to 55 fs for time- and angle-resolved photoemission spectroscopy

Abstract

Developing a widely tunable vacuum ultraviolet (VUV) source with sub-100 femtoseconds (fs) pulse duration is critical for ultrafast pump-probe techniques such as time- and angle-resolved photoemission spectroscopy (TrARPES). While a tunable probe source with photon energy of 5.3 - 7.0 eV has been recently implemented for TrARPES by using a KBe${}_2$BO${}_3$F${}_2$ (KBBF) device, the time resolution of 280 - 320 fs is still not ideal, which is mainly limited by the duration of the VUV probe pulse generated by the KBBF device. Here, by designing a new KBBF device which is specially optimized for fs applications, an optimum pulse duration of 55 fs is obtained after systematic diagnostics and optimization. More importantly, a high time resolution of 81 - 95 fs is achieved for TrARPES measurements covering the probe photon energy range of 5.3 - 7.0 eV, making it particularly useful for investigating the ultrafast dynamics of quantum materials. Our work extends the application of KBBF device to ultrafast pump-probe techniques with the advantages of both widely tunable VUV source and ultimate time resolution.

8 pages, 4 figures

References in corpus (10)

• Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
• Development of a Vacuum Ultra-Violet Laser-Based Angle-Resolved Photoemission System with a Super-High Energy Resolution Better Than 1 meV
• Angle-resolved photoemission spectroscopy
• Ultrafast Angle-Resolved Photoemission Spectroscopy of Quantum Materials
• Intervalley scattering in MoS${}_2$ imaged by two-photon photoemission with a high-harmonic probe
• Tuning time and energy resolution in time-resolved photoemission spectroscopy with nonlinear crystals
• A time- and angle-resolved photoemission spectroscopy with probe photon energy up to 6.7 eV
• Ultrafast time- and angle-resolved photoemission spectroscopy with widely tunable probe photon energy of 5.3-7.0 eV for investigating dynamics of three-dimensional materials
• Population inversion and Dirac fermion cooling in 3D Dirac semimetal Cd${}_3$As${}_2$
• Coexistence of Ferroelectric-like Polarization and Dirac-like Surface State in TaNiTe5

Cited by in corpus (4)

• Advancing time- and angle-resolved photoemission spectroscopy: The role of ultrafast laser development
• Ultrafast Carrier Relaxation Dynamics in a Nodal-Line Semimetal PtSn${}_4$
• Hidden charge density wave induced shadow bands and ultrafast dynamics of CuTe investigated using time-resolved ARPES
• High harmonic generation light source with polarization selectivity and sub-100-$\mu$m beam size for time- and angle-resolved photoemission spectroscopy