Gbanwee ọsọ usu nke laser ultrashort siri ike

Gbanwee ọsọ pulse nkeultrashort laser siri ike

Laser ultra-short na-ezo aka na pulse laser nwere obosara usu nke iri na narị narị femtoseconds, ike kacha elu nke terawatts na petawatts, na ọkụ ha lekwasịrị anya karịrị 1018 W/cm2. Super ultra-short laser na ya emepụtara super radieshon isi iyi na ike dị elu nwere uru dị ukwuu nke ngwa n'ọtụtụ ntụzịaka nyocha dị ka physics ike dị elu, physics particle, physics plasma, physics nuclear na astrophysics, na mmepụta nke sayensị. nsonaazụ nyocha nwere ike ijere ụlọ ọrụ teknụzụ dị elu dị mkpa, ahụike ahụike, ike gburugburu ebe obibi na nchekwa nchekwa mba. Ebe ọ bụ na e mepụtara teknụzụ nkwalite pulse chirped na 1985, mpụta nke mbụ iti watt n'ụwa.laserna 1996 na mmecha nke ụwa mbụ 10-beat watt laser na 2017, elekwasị anya nke super ultra-short laser n'oge gara aga bụ tumadi iji nweta "kasị ike ọkụ". N'ime afọ ndị na-adịbeghị anya, ọmụmụ egosiwo na n'okpuru ọnọdụ nke ịnọgide na-enwe super laser pulses, ma ọ bụrụ na pulse nnyefe ọsọ nke super ultra-short laser nwere ike ịchịkwa, ọ nwere ike iweta ugboro abụọ n'ihi na ọkara mgbalị ụfọdụ ngwa anụ ahụ, nke a na-atụ anya. iji belata ọnụ ọgụgụ nke super ultra-shortngwaọrụ laser, mana kwalite mmetụta ya na nnwale physics laser dị elu.

Mgbagha nke pulse n'ihu laser ultrashort siri ike
Iji nweta ike kachasị elu n'okpuru ike dị oke, a na-ebelata obosara nke pulse na 20 ~ 30 femtoseconds site na ịbawanye bandwidth uru. Ike pulse nke ugbu a 10-beak-watt ultra-short laser bụ ihe dị ka joules 300, na ọnụ ala mmebi dị ala nke compressor grating na-eme ka oghere ọkụ na-adịkarị karịa 300 mm. The pulse doo na 20 ~ 30 femtosecond usu obosara na 300 mm oghere dị mfe na-ebu spatiotemporal njikọ distortion, karịsịa distortion nke usu n'ihu. Ọnụọgụ 1 (a) na-egosi nkewa nke spatio-temporal nke pulse n'ihu na n'ihu n'ihu na-akpata site na mgbasa ọrụ beam, na nke mbụ na-egosi "spatio-temporal tilt" n'akụkụ nke ikpeazụ. Nke ọzọ bụ mgbagwoju anya "mkpụrụkpụ nke oge-oge" nke usoro oghere kpatara. FIG. 1 (b) na-egosi mmetụta nke ezigbo pulse n'ihu, na-atụgharị uche n'ihu na ihu ihu na-agbagọ na spatio-temporal distortion of the light field on the target. N'ihi ya, a na-ebelata ọkụ ọkụ a na-elekwasị anya nke ukwuu, nke na-adịghị akwado ngwa ubi siri ike nke laser ultra-short laser.

FIG. 1 (a) tilt nke pulse n'ihu nke prism na grating kpatara, na (b) mmetụta nke mgbagwoju anya nke pulse n'ihu na oghere ohere oge na ebumnuche.

Njikwa ọsọ nke ultra-ikeultrashort laser
Ka ọ dị ugbu a, bems Bessel mepụtara site na conical superposition nke ebili mmiri ụgbọ elu egosila uru ngwa na physics laser dị elu. Ọ bụrụ na a conically superimposed pulsed doo nwere ihe axisymmetric usu n'ihu nkesa, mgbe ahụ geometric center ike nke eme X-ray ife ngwugwu dị ka e gosiri na Figure 2 nwere ike ịbụ mgbe nile superluminal, mgbe nile subluminal, accelerated superluminal, na decelerated subluminal. Ọbụlagodi nchikota nke enyo na-emebi emebi na ụdị ụdị ọkụ modulator nwere ike iwepụta ụdị spatio-oge na-adịghị agbanwe agbanwe nke n'ihu usu, wee mepụta ọsọ nnyefe a na-achịkwaghị achịkwa. Mmetụta anụ ahụ dị n'elu na nkà na ụzụ modulation ya nwere ike gbanwee "ngbanwe" nke n'ihu pulse ka ọ bụrụ "nchịkwa" nke n'ihu pulse, wee ghọta nzube nke modulating nnyefe ọsọ nke ultra-ike ultra-short laser.

FIG. 2 (a) ọkụ na-adị ngwa ngwa karịa ọkụ, (b) ìhè dị n'okpuru ala mgbe niile, (c) gbagoro ọsọ ọsọ karịa ọkụ, na (d) ọkụ ọkụ dị n'okpuru ala ewepụtara site na nnukwu ọnọdụ dị na etiti geometric nke mpaghara superposition.

Ọ bụ ezie na nchoputa nke pulse n'ihu distortion bụ tupu super ultra-short laser, ọ na-enwe mmetụta nke ukwuu tinyere mmepe nke super ultra-short laser. Ruo ogologo oge, ọ bụghị ihe na-akwado mmezu nke isi ihe mgbaru ọsọ nke super ultra-short laser - ultra-high focusing light intensity, na ndị nchọpụta na-arụ ọrụ iji kwụsị ma ọ bụ wepụ dị iche iche pulse n'ihu distortion. Taa, mgbe "pulse n'ihu distortion" tolitere n'ime "pulse n'ihu njikwa", ọ nwetala ụkpụrụ nke nnyefe ọsọ nke super ultra-short laser, na-enye ụzọ ọhụrụ na ohere ọhụrụ maka ngwa nke super ultra-short laser. physics laser dị elu.