Shandura pulse speed yesuper-yakasimba ultrashort laser
Super ultra-short lasers anowanzo tarisa kune laser pulses ane pulse hupamhi hwemakumi uye mazana efemtoseconds, peak simba reterawatts uye petawatts, uye iwo anotarisisa mwenje kusimba kunodarika 1018 W / cm2. Super ultra-short laser uye inogadzirwa super radiation sosi uye yakakwira simba particle sosi ine huwandu hwakasiyana hwekukosha kwekushandisa mune akawanda ekutanga nzira dzekutsvagisa senge yakakwira simba fizikisi, particle physics, plasma physics, nuclear physics uye astrophysics, uye kubuda kwesainzi. tsvakiridzo mhedzisiro inogona kushandira yakakodzera maindasitiri epamusoro-soro, hutano hwekurapa, simba rezvakatipoteredza uye kuchengetedzwa kwenyika. Kubva pakagadzirwa tekinoroji yekusimudza pulse muna 1985, kubuda kwebhiti yekutanga pasi rose.lasermuna 1996 uye kupedzwa kweyekutanga pasi rose 10-beat watt laser muna 2017, tarisiro yesuper ultra-short laser munguva yakapfuura yanga iri yekuwana "chiedza chakanyanya". Mumakore achangopfuura, zvidzidzo zvakaratidza kuti pasi pemamiriro ekuchengetedza super laser pulses, kana iyo pulse transmisheni yekumhanya ye super ultra-short laser inogona kudzorwa, inogona kuunza zvakapetwa kaviri mhedzisiro nehafu yekuedza mune mamwe maapplication emuviri, anotarisirwa. kuderedza chiyero che super ultra-shortLaser zvishandiso, asi vandudza maitiro ayo mune yakakwirira-munda laser fizikisi kuyedza.
Kukanganiswa kwepulse kumberi kweultra-strong ultrashort laser
Kuti uwane simba repamusoro pasi pesimba shoma, iyo pulse hupamhi inoderedzwa kusvika 20 ~ 30 femtoseconds nekuwedzera kuwana bandwidth. Iyo pulse simba yeazvino 10-beak-watt Ultra-pfupi laser ingangoita mazana matatu ejoules, uye yakaderera kukuvara chikumbaridzo checompressor grating chinoita kuti danda aperture riwedzere kupfuura mazana matatu mm. Iyo pulse beam ine 20 ~ 30 femtosecond pulse wide uye 300 mm aperture iri nyore kutakura spatiotemporal coupling kukanganisa, kunyanya kukanganisa kwepurusi kumberi. Mufananidzo 1 (a) unoratidza kupatsanurwa kwespatio-temporal yekupuruzira kumberi uye kumberi kwechikamu kunokonzerwa neiyo danda basa kupararira, uye yekutanga inoratidza "spatio-temporal tilt" inoenderana neyekupedzisira. Imwe yacho ndiyo yakanyanya kuomesesa "curvature of space-time" inokonzerwa nelens system. FIG. 1 (b) inoratidza mhedzisiro yeyakanaka pulse kumberi, yakarerekera pulse kumberi uye yakabhenda pulse kumberi pane spatio-temporal kukanganisa kwechiedza chechiedza pane icho chinangwa. Nekuda kweizvozvo, iyo yakatariswa mwenje intensity inodzikiswa zvakanyanya, izvo zvisingaenderane kune yakasimba munda application ye super ultra-short laser.
FIG. 1 (a) kurereka kwepombo kumberi kunokonzerwa neprism uye kugezesa, uye (b) kukanganisa kwekupopudza kumberi panzvimbo yechiedza chenguva pane chinangwa.
Pulse speed control ye-ultra-strongUltrashort laser
Parizvino, matanda eBessel anogadzirwa neconical superposition yemafungu endege aratidza kukosha kwekushandisa mune yakakwirira munda laser fizikisi. Kana iyo conically superimposed pulsed beam ine axisymmetric pulse front distribution, ipapo geometric center intensity yeyakagadzirwa X-ray wave packet sezvinoratidzwa muFigure 2 inogona kuramba iine superluminal, inogara iri subluminal, inomhanyisa superluminal, uye yakaderedzwa subluminal. Kunyangwe musanganiswa wegirazi rinoremara uye chikamu chemhando yemhepo mwenje modulator inogona kuburitsa inopokana spatio-temporal chimiro che pulse kumberi, uye yobva yagadzira zvisingaite inodzoreka kutapurirana kumhanya. Iyo iri pamusoro pekuita kwemuviri uye yayo modulation tekinoroji inogona kushandura "kukanganisa" kwepuru kumberi kuita "kutonga" kwepuru kumberi, uye wobva waziva chinangwa chekugadzirisa kumhanya kwekutapurirana kweyekupedzisira-yakasimba yekupedzisira-pfupi laser.
FIG. 2 Iyo (a) inogara ichikurumidza-kupfuura-chiedza, (b) inogara ichipenya, (c) yakakurumidza kukurumidza-kupfuura-chiedza, uye (d) yakaderedzwa yepasi-yechiedza pulses inogadzirwa nepamusoro-soro inowanikwa mugeometric pakati penzvimbo yepamusoro.
Kunyangwe kuwanikwa kwepulse kumberi kukanganiswa kuri kwekutanga kupfuura super ultra-short laser, yanga ichinetsekana zvakanyanya pamwe nekuvandudzwa kweiyo super ultra-short laser. Kwenguva yakareba, hazvikodzeri pakuzadzikiswa kwechinangwa chakakosha che super ultra-short laser - Ultra-yakakwirira inotarisisa kusimba kwechiedza, uye vaongorori vanga vachishanda kudzvanya kana kubvisa kwakasiyana pulse kumberi kukanganisa. Nhasi, kana "pulse front distortion" yave "pulse front control", yakawana kudzora kwekumhanya kweye super ultra-short laser, ichipa nzira nyowani nemikana mitsva yekushandiswa kwe super ultra-short laser mu. high-field laser fizikisi.
Nguva yekutumira: May-13-2024