Umthombo wokukhanya okukhazimulayo kwe-ultraviolet okwedlulele

Umthombo wokukhanya okukhazimulayo kwe-ultraviolet okwedlulele

Amasu angemuva kokucindezelwa ahlanganiswe nezinkambu ezinemibala emibili akhiqiza umthombo wokukhanya we-ultraviolet owedlulele we-flux ephezulu
Kuzinhlelo zokusebenza ze-Tr-ARPES, ukwehlisa ubude begagasi bokukhanya kokushayela kanye nokwandisa amathuba e-ionization yegesi izindlela ezisebenzayo zokuthola ukuguquguquka okuphezulu nokuhleleka okuphezulu. Enqubweni yokukhiqiza ama-harmonics ane-oda eliphezulu anemvamisa yokuphindaphinda okuphezulu kwe-pass eyodwa, indlela yokuphinda kabili noma kathathu iyamukelwa ngokuyisisekelo ukuze kwandiswe ukusebenza kahle kokukhiqizwa kwama-harmonics ane-oda eliphezulu. Ngosizo lokucindezelwa kwe-post-pulse, kulula ukufeza ukuminyana kwamandla aphezulu adingekayo ekukhiqizeni i-harmonic ye-oda eliphezulu ngokusebenzisa ukukhanya okufushane kwe-pulse drive, ngakho-ke ukusebenza kahle kokukhiqiza okuphezulu kungatholakala kunaleyo ye-pulse drive ende.

I-monochromator ye-grating kabili izuza isinxephezelo sokutshekela phambili kwe-pulse
Ukusetshenziswa kwento eyodwa ye-diffractive ku-monochromator yethula ushintsho kuopticalUmzila we-radially emisebeni ye-ultra-short pulse, eyaziwa nangokuthi i-pulse forward tilt, okuholela ekweluleni kwesikhathi. Isamba somehluko wesikhathi sendawo yokuhlukanisa enobude beza beza obuhlukile obungu-λ kuhlelo lokuhlukanisa u-m ngu-Nmλ, lapho u-N eyingqikithi yenani lemigqa yokugezela ekhanyisiwe. Ngokungeza isici sesibili se-diffractive, i-pulse etshekile ngaphambili ingabuyiselwa, futhi i-monochromator enesinxephezelo sokulibaziseka kwesikhathi ingatholakala. Futhi ngokulungisa indlela yokubona phakathi kwezingxenye ezimbili ze-monochromator, i-grating pulse shaper ingenziwa ngendlela oyifisayo ukuze inxephezele ngokunembile ukusabalalisa okungokwemvelo kwemisebe ye-harmonic ehlelekile. Kusetshenziswa idizayini yesinxephezelo sokubambezeleka kwesikhathi, uLucchini et al. ibonise ukuthi kungenzeka yini ukukhiqiza kanye nezimpawu ze-ultra-short monochromatic extreme ultraviolet pulses enobubanzi be-pulse obungu-5 fs.
Ithimba labacwaningi be-Csizmadia e-ELE-Alps Facility e-European Extreme Light Facility lizuze ukushintshwa kwe-spectrum nokushaya kwenhliziyo kokukhanya okwedlulele kwe-ultraviolet lisebenzisa i-monochromator yesinxephezelo yokulibaziseka ephindwe kabili ye-grating kufrikhwensi yokuphindaphinda okuphezulu, umugqa we-harmonic wokuhleleka okuphezulu. Bakhiqize ama-harmonics aphezulu besebenzisa idrayivulaserngesilinganiso sokuphindaphinda esingu-100 kHz futhi ithole ububanzi obudlulele be-ultraviolet obungu-4 fs. Lo msebenzi uvula amathuba amasha okuhlolwa okuxazululwe isikhathi ekutholweni kwe-situ endaweni ye-ELI-ALPS.

Umthombo wokukhanya kwe-ultraviolet okuvamise ukuphindaphindeka ngokwedlulele usetshenziswe kabanzi ocwaningweni lokuguquguquka kwama-electron, futhi ubonise amathuba okusebenza okubanzi emkhakheni we-attosecond spectroscopy kanye ne-imaging microscopic. Ngokuqhubeka okuqhubekayo kanye nokuqanjwa okusha kwesayensi nobuchwepheshe, imvamisa ephezulu yokuphindaphinda i-ultraviolet eyeqisayoumthombo wokukhanyaiqhubekela phambili ekuqondeni kwefrikhwensi ephezulu yokuphindaphinda, i-photon flux ephakeme, amandla e-photon aphezulu kanye nobubanzi be-pulse obufushane. Ngokuzayo, ucwaningo oluqhubekayo mayelana nokuphindaphinda okuphezulu kwemithombo yokukhanya kwe-ultraviolet okwedlulele luzoqhubekisela phambili ukukhuthaza ukusetshenziswa kwayo ku-electronic dynamics nakweminye imikhakha yocwaningo. Ngasikhathi sinye, ubuchwepheshe bokwenza kahle nokulawula bomthombo wokukhanya kwe-ultraviolet okuphindaphindwayo kwemvamisa ephezulu kanye nokusebenza kwawo kumasu okuhlola afana ne-angular resolution photoelectron spectroscopy nakho kuzoba okugxilwe ocwaningweni lwangomuso. Ngaphezu kwalokho, ubuchwepheshe be-atosecond transient absorption spectroscopy obuxazululwe isikhathi kanye nobuchwepheshe be-imaging be-microscopic besikhathi sangempela obusekelwe ekuphindaphindweni okuphezulu komthombo wokukhanya kwe-ultraviolet okwedlulele nakho kulindeleke ukuthi kuqhutshekwe kufundwe, kuthuthukiswe futhi kusetshenziswe ukuze kuzuzwe ukunemba okuphezulu kwe-attosecond okuxazululwe. kanye nesithombe esixazululwe yi-nanospace esikhathini esizayo.