Umthombo wokukhanya okuphezulu kakhulu kwe-ultraviolet ophindaphindayo

Umthombo wokukhanya okuphezulu kakhulu kwe-ultraviolet ophindaphindayo

Amasu angemva kokucindezela ahlanganiswe nezinkambu zemibala emibili akhiqiza umthombo wokukhanya we-ultraviolet ogeleza kakhulu
Kuzinhlelo zokusebenza ze-Tr-ARPES, ukunciphisa ubude besikhathi bokukhanya okushayelayo nokwandisa amathuba okusebenzisa i-gas ionization kuyindlela ephumelelayo yokuthola i-high flux kanye ne-high order harmonics. Enkambisweni yokukhiqiza i-high-order harmonics nge-single-pass high-repetition frequency, indlela ye-frequency doubled noma ye-triple doubled isetshenziswa ngokuyisisekelo ukwandisa ukusebenza kahle kokukhiqiza kwe-high-order harmonics. Ngosizo lokucindezela kwe-post-pulse, kulula ukufeza ubuningi bamandla obuphezulu obudingekayo ekukhiqizweni kwe-high-order harmonic ngokusebenzisa ukukhanya kwe-pulse drive okufushane, ngakho-ke ukusebenza kahle kokukhiqiza okuphezulu kungatholakala kunokwe-pulse drive ende.

I-monochromator ene-grating ephindwe kabili ifinyelela isinxephezelo sokuthambekela kwe-pulse forward
Ukusetshenziswa kwento eyodwa ehlukanisayo ku-monochromator kuletha ushintsho ku-ukukhanyaindlela eqondile emisebeni ye-pulse emfushane kakhulu, eyaziwa nangokuthi ukuthambekela kwe-pulse phambili, okuholela ekunwebeni kwesikhathi. Umehluko wesikhathi esiphelele sendawo ye-diffraction ene-wavelength ye-diffraction λ ku-oda le-diffraction m yi-Nmλ, lapho i-N iyinani eliphelele lemigqa ye-grating ekhanyisiwe. Ngokufaka isici sesibili se-diffractive, i-pulse front ethambekile ingabuyiselwa, futhi i-monochromator ene-time delay cost ingatholakala. Futhi ngokulungisa indlela ye-optical phakathi kwezingxenye ezimbili ze-monochromator, i-grating pulse shaper ingenziwa ngokwezifiso ukuze ikhokhele ngokunembile ukusabalala okungokwemvelo kwemisebe ye-harmonic ephezulu. Besebenzisa umklamo we-time-delay condition, uLucchini et al. babonise ukuthi kungenzeka ukukhiqiza nokuchaza ama-ultraviolet pulses e-ultra-short monochromatic extreme pulses anobubanzi be-pulse obuyi-5 fs.
Ithimba locwaningo le-Csizmadia e-ELE-Alps Facility e-European Extreme Light Facility lithole i-spectrum kanye ne-pulse modulation yokukhanya okukhulu kwe-ultraviolet lisebenzisa i-double grating time-delay compensation monochromator kumugqa we-harmonic beam ophindaphindayo kakhulu, olandelanayo. Bakhiqize ama-harmonic e-oda eliphezulu besebenzisa i-drive.i-laserngesilinganiso sokuphindaphinda esingu-100 kHz futhi sathola ububanzi obukhulu be-ultraviolet pulse obungu-4 fs. Lo msebenzi uvula amathuba amasha okuhlolwa okuxazululwe ngesikhathi sokutholwa kwe-situ esikhungweni se-ELI-ALPS.

Umthombo wokukhanya kwe-ultraviolet okuphindaphindwayo okuphezulu usetshenziswe kabanzi ekufundweni kwe-electron dynamics, futhi ubonise amathuba amaningi okusetshenziswa emkhakheni we-attosecond spectroscopy kanye ne-microscopic imaging. Ngokuthuthuka okuqhubekayo kanye nokusungula izinto ezintsha kwesayensi nobuchwepheshe, i-ultraviolet ephindaphindwayo ephezulu isetshenziswa kabanzi ekucwaningweni kwe-electron dynamics.umthombo wokukhanyaithuthuka ngendlela yokuphindaphinda okuphezulu, i-photon flux ephezulu, amandla aphezulu e-photon kanye nobubanzi obufushane bokushaya kwenhliziyo. Esikhathini esizayo, ucwaningo oluqhubekayo ngemithombo yokukhanya kwe-ultraviolet ephindaphindayo ephezulu luzothuthukisa ukusetshenziswa kwayo ku-electronic dynamics nakwezinye izinkambu zocwaningo. Ngesikhathi esifanayo, ubuchwepheshe bokwenza ngcono kanye nokulawula komthombo wokukhanya we-ultraviolet ophindaphindayo ophezulu kanye nokusetshenziswa kwawo kumasu okuhlola njenge-angle resolution photoelectron spectroscopy nakho kuzoba yinto ebalulekile ocwaningweni lwesikhathi esizayo. Ngaphezu kwalokho, ubuchwepheshe be-attosecond transient absorption spectroscopy obuxazululwe ngesikhathi kanye nobuchwepheshe be-microscopic imaging real-time obusekelwe emthonjeni wokukhanya we-ultraviolet ophindaphindayo ophezulu kulindeleke ukuthi bufundwe kabanzi, buthuthukiswe futhi busetshenziswe ukuze kufezwe ukuthwebula okunembe kakhulu kwe-attosecond time-resolved kanye ne-nanospace-resolved esikhathini esizayo.