Umthombo wokukhanya okugqithisileyo kwe-ultraviolet

Umthombo wokukhanya okugqithisileyo kwe-ultraviolet

Ubugcisa be-post-compression zidityaniswe nemimandla enemibala emibini ivelisa umthombo wokukhanya ogqithiseleyo we-ultraviolet
Ukusetyenziswa kwe-Tr-ARPES, ukunciphisa ubude be-waveleng yokukhanya kokuqhuba kunye nokwandisa amathuba okuba ne-ionization yerhasi ziindlela ezisebenzayo zokufumana i-flux ephezulu kunye ne-harmonics yomyalelo ophezulu. Kwinkqubo yokuvelisa i-harmonics yomyalelo ophezulu kunye ne-single-pass high-repetition frequency, i-frequency yokuphindaphinda kabini okanye indlela yokuphinda kabini yamkelwe ngokusisiseko ukunyusa ukusebenza kwemveliso yee-harmonics zomyalelo ophezulu. Ngoncedo lokunyanzeliswa kwe-post-pulse, kulula ukufikelela kwincopho yoxinaniso lwamandla olufunekayo kwisizukulwana esiphezulu se-harmonic ngokusebenzisa i-short pulse drive light, ngoko ke ukusebenza okuphezulu kwemveliso kunokufumaneka kunokokude kwe-pulse drive.

I-monochromator yokubamba kabini ifezekisa imbuyekezo ye-pulse forward tilt
Ukusetyenziswa kwento enye ye-diffractive kwi-monochromator yazisa utshintsho kwiukubonaUmzila we-radially kumqadi we-ultra-short pulse, eyaziwa ngokuba yi-pulse forward tilt, ekhokelela kwixesha elizolula. Umahluko wexesha lilonke lendawo ye-diffraction ene-diffraction wavelength λ kwi-diffraction order m yi-Nmλ, apho i-N ilinani lilonke lemigca yegrayiti ekhanyisiweyo. Ngokudibanisa i-diffractive element yesibini, i-tilted pulse front inokubuyiselwa, kwaye i-monochromator enembuyekezo yokulibaziseka kwexesha inokufumaneka. Kwaye ngokulungelelanisa indlela yokubona phakathi kwamacandelo amabini e-monochromator, i-grating pulse shaper inokwenziwa ngokwezifiso ukuze ihlawule ngokuchanekileyo ukusasazwa kwemitha ye-harmonic. Ukusebenzisa uyilo lwembuyekezo yokulibaziseka kwexesha, uLucchini et al. ibonise ukuba nokwenzeka kokuvelisa kunye nokubonakalisa i-ultra-short monochromatic egqithisileyo ye-ultraviolet pulses kunye nobubanzi be-pulse ye-5 fs.
Iqela lophando lwe-Csizmadia kwi-ELE-Alps Facility kwi-European Extreme Light Facility iphumelele i-spectrum kunye ne-pulse modulation yokukhanya okugqithisileyo kwe-ultraviolet usebenzisa i-double grating time-deymbuyekezo i-monochromator kwi-high-repetition frequency, i-high-order harmonic beam line. Bavelise i-harmonics yomyalelo ophezulu usebenzisa i-drivelaserkunye nesantya sokuphindaphinda i-100 kHz kwaye iphumelele ngokugqithisileyo kwe-ultraviolet pulse ububanzi be-4 fs. Lo msebenzi uvula amathuba amatsha ovavanyo olusonjululwe lixesha kwi-situ ubhaqo kwiziko le-ELI-ALPS.

Ukuphindaphinda okuphindaphindiweyo komthombo wokukhanya kwe-ultraviolet ngokugqithiseleyo isetyenziswe ngokubanzi kufundo lwe-electron dynamics, kwaye ibonise amathuba okusebenza okubanzi kwinkalo ye-attosecond spectroscopy kunye ne-imaging microscopic. Ngenkqubela phambili eqhubekayo kunye nokutsha kwesayensi kunye nethekhnoloji, ukuphindaphinda okuphindaphindiweyo kwe-ultravioletumthombo wokukhanyaiqhubela phambili kwicala lokuphindaphinda okuphindaphindiweyo, i-photon flux ephezulu, amandla e-photon aphezulu kunye nobubanzi obufutshane be-pulse. Kwixesha elizayo, uphando oluqhubekayo malunga nokuphindaphinda okuphindaphindiweyo kwemithombo yokukhanya kwe-ultraviolet ngokugqithiseleyo kuya kukhuthaza ngakumbi ukusetyenziswa kwabo kumandla ombane kunye neminye imimandla yophando. Kwangaxeshanye, itekhnoloji yokuphucula kunye nokulawula itekhnoloji yophinda-phindo oluphezulu lomthombo wokukhanya kwe-ultraviolet kunye nokusetyenziswa kwayo kubuchule bokulinga obunje ngesisombululo se-angular photoelectron spectroscopy iya kuba yinto ekugxilwe kuyo kuphando lwexesha elizayo. Ukongeza, itekhnoloji ye-atosecond esonjululwe lixesha ye-atosecond yokufunxa okwexeshana kunye netekhnoloji ye-imaging ye-microscopic yexesha lokwenyani esekwe kumthombo wokukhanya okuphindaphindiweyo kwe-ultraviolet ilindeleke ukuba ifundwe ngakumbi, iphuhliswe kwaye isetyenziswe ukufezekisa ukuchaneka okuphezulu kwe-attosecond esonjululwe. kunye ne-nanospace-esonjululwe umfanekiso kwixesha elizayo.