Laser dị oke ọsọ maka sayensị attosecond

Laser dị oke ọsọmaka sayensị attosecond
Ugbu a, a na-enweta attosecond pulses site na mmepụta harmonic dị elu (HHG) nke ubi siri ike na-akwali. A pụrụ ịghọta ihe dị mkpa nke mmepụta ha dị ka elektrọn ndị a na-eme ka ha dị ka ion, ngwa ngwa, ma jikọta ha ọzọ site na oghere eletriki laser siri ike iji wepụta ike, si otú a na-ewepụta attosecond XUV pulses.
Ya mere, mmepụta attosecond na-enwe mmetụta dị ukwuu na obosara pulse, ike, ogologo ebili mmiri, na ọnụego ugboro ugboro nkelaser ịkwọ ụgbọala(Lesera dị oke ọsọ): obosara mkpali dị mkpụmkpụ bara uru maka ikewapụ mkpali attosecond, ike dị elu na-eme ka ionization na arụmọrụ dịkwuo mma, ogologo ogologo na-ebuli ike mbepụ mana ọ na-ebelata arụmọrụ ntụgharị nke ukwuu, ọnụego ugboro ugboro na-emekwa ka oke mgbaàmà-na-mkpọtụ dịkwuo mma mana ike pulse otu na-ejedebe. Ngwa dị iche iche (dịka microscopy elektrọn, X-ray absorption spectroscopy, coincidence counting, wdg) nwere isi ihe dị iche iche na attosecond pulse index, nke na-ebute ihe dị iche na nke zuru oke maka lasers driving. Imeziwanye arụmọrụ nke lasers driving dị oke mkpa maka ojiji na sayensị attosecond.

Ụzọ teknụzụ anọ dị mkpa iji melite arụmọrụ nke lasers ịkwọ ụgbọala (Lazara ngwa ngwa nke ukwuu)
1. Ike dị elu: Emebere ya iji merie obere arụmọrụ mgbanwe nke HHG ma nweta pulse attosecond dị elu. Mgbanwe teknụzụ agbanweela site na njikọta pulse chipped (CPA) ọdịnala gaa na ezinụlọ njikọta pulse optical, gụnyere njikọta pulse chirped optical parametric (OPCPA), njikọta pulse chirped dual (DC-OPA), njikọta frequency domain OPA (FOPA), na njikọta phase quasi OPCPA (QPCPA). Ijikọta usoro njikọta coherent beam (CBC) na njikọta pulse kewara (DPA) iji merie oke anụ ahụ nke amplifiers otu ọwa, dị ka mmetụta okpomọkụ na mmebi na-abụghị ahịrị, ma nweta mmepụta ike ọkwa Joule.
2. Obosara mkpali dị mkpụmkpụ: Emebere ya iji mepụta pulses attosecond nke enwere ike iji nyochaa dynamics eletrọniki, nke chọrọ obere ma ọ bụ ọbụna obere oge driving pulses na stabilized carrier envelopu phase (CEP). Teknụzụ ndị bụ isi gụnyere iji usoro mkpakọ post na-abụghị nke linear dị ka hollow core fiber (HCF), multi thin film (MPSC), na multi-channel cave (MPC) iji kpachie pulse obosara ruo ogologo dị mkpụmkpụ. A na-eji f-2f interferometer tụọ nkwụsi ike CEP ma nweta ya site na nzaghachi na-arụ ọrụ/feedforward (dị ka AOFS, AOPDF) ma ọ bụ usoro nhazi onwe onye na-anaghị arụ ọrụ nke ọma dabere na usoro ọdịiche ugboro ugboro.
3. Ogologo ogologo: Emebere ya iji tinye ike foton attosecond na band "window mmiri" maka onyonyo biomolecule. Ụzọ teknụzụ atọ bụ isi bụ:
Mmụbawanye parametric Optical (OPA) na cascade ya: Ọ bụ ihe ngwọta bụ isi na oke ogologo 1-5 μm, na-eji kristal dịka BiBO na MgO: LN; >A chọrọ kristal dịka ZGP na LiGaS ₂ maka band ogologo 5 μm.
Mmepụta Ugboro Dị Iche Iche (DFG) na Ugboro Dị Iche Iche Intra Pulse (IPDFG): nwere ike inye isi mmalite mkpụrụ osisi nkwụsi ike na CEP na-anaghị arụ ọrụ.
A maara teknụzụ laser ozugbo, dịka Cr: ZnS/Se transition metal doped chalcogenide lasers, dị ka "mid infrared titanium sapphire" ma nwee uru nke nhazi dị obere na arụmọrụ dị elu.
4. Oke ugboro ugboro: ebumnuche imeziwanye oke mgbaàmà-na-mkpọtụ na arụmọrụ nnweta data, yana idozi oke nke mmetụta chajị oghere. Ụzọ abụọ bụ isi:
Teknụzụ oghere emelitere nke ọma: site na iji oghere resonant dị elu iji melite ike kachasị elu nke megahertz ọkwa ugboro ugboro iji chụpụ HHG, etinyerela ya n'ọhịa dịka XUV frequency combs, mana imepụta attosecond pulses ka na-eweta nsogbu.
Oke ugboro ugboro nalaser dị ike nke ukwuudraịva kpọmkwem, gụnyere OPCPA, eriri CPA jikọtara ya na mkpakọ post na-abụghị ahịrị, na oscillator fim dị gịrịgịrị, enwetala mmepụta attosecond pulse na ọnụego ugboro ugboro nke 100 kHz.