Laser e potlakileng haholo bakeng sa saense ea attosecond

Laser e potlakileng haholobakeng sa saense ea attosecond
Hona jwale, di-pulse tsa attosecond di fumanwa haholoholo ka tlhahiso ya maemo a hodimo ya harmonic (HHG) e tsamaiswang ke masimo a matla. Moko wa tlhahiso ya tsona o ka utlwisiswa e le dielektrone tse fetolwang ion, tse potlakileng, le ho kopanngwa hape ke tshimo e matla ya motlakase ya laser ho lokolla matla, ka hona di ntsha di-pulse tsa attosecond XUV.
Ka hona, tlhahiso ea attosecond e tebile haholo ho latela bophara ba pulse, matla, bolelele ba maqhubu le sekhahla sa ho pheta-pheta halaser ea ho khanna(Leser e potlakileng haholo): bophara ba pulse bo bokhutšoanyane bo molemo bakeng sa ho arola li-pulse tsa attosecond, matla a phahameng a ntlafatsa ionization le bokgoni, bolelele ba maqhubu bo bolelele bo phahamisa matla a cutoff empa bo fokotsa haholo bokgoni ba phetoho, mme sekhahla se phahameng sa ho pheta-pheta se ntlafatsa karolelano ya letshwao-ho-lerata empa se lekanyetswa ke matla a le mong a pulse. Ditshebediso tse fapaneng (jwalo ka microscopy ya elektrone, spectroscopy ya ho monya X-ray, ho bala ka tshohanyetso, jj.) di na le kgatello e fapaneng hodima index ya pulse ya attosecond, e hlahisang ditlhoko tse fapaneng le tse felletseng bakeng sa di-laser tsa ho kganna. Ho ntlafatsa tshebetso ya di-laser tsa ho kganna ho bohlokwa bakeng sa tshebediso saenseng ya attosecond.

Litsela tse 'ne tsa motheo tsa theknoloji ho ntlafatsa ts'ebetso ea li-laser tse khannang (Laser e potlakileng haholo)
1. Matla a Phahameng: E ​​etselitsoe ho hlola bokgoni bo tlase ba phetoho ya HHG le ho fumana di-pulse tsa attosecond tse nang le phallo e phahameng. Phetoho ya theknoloji e fetohile ho tloha ho amplification ya pulse ya setso ya chirped (CPA) ho ya ho lelapa la optical parametric amplification, ho kenyeletswa le optical parametric chirped pulse amplification (OPCPA), dual chirped OPA (DC-OPA), frequency domain OPA (FOPA), le quasi phase matching OPCPA (QPCPA). Ho kopanya hape mekgwa ya ho kopanya coherent beam synthesis (CBC) le pulse splitting amplification (DPA) ho hlola mefokolo ya mmele ya di-amplifier tsa kanale e le nngwe, jwalo ka ditlamorao tsa mocheso le tshenyo e seng ya mola, le ho fihlella tlhahiso ya matla a boemo ba Joule.
2. Bophara ba pulse bo bokgutshwane: E etseditswe ho hlahisa di-pulse tsa attosecond tse arohaneng tse ka sebediswang ho sekaseka di-dynamic tsa elektroniki, tse hlokang di-pulse tse mmalwa kapa esita le tsa sub periodic driving le stable carrier envelope phase (CEP). Ditheknoloji tse ka sehloohong di kenyelletsa ho sebedisa mekgwa ya ho hatella kamora ho se be le mola jwalo ka ho se be le sekoti sa core fiber (HCF), multi thin film (MPSC), le multi-channel cavity (MPC) ho hatella bophara ba pulse ho isa boleleleng bo bokgutshwane haholo. Botsitso ba CEP bo lekanngwa ho sebediswa f-2f interferometer mme bo fihlellwa ka active feedback/feedforward (jwalo ka AOFS, AOPDF) kapa passive all-optical self stabilization methods ipapisitse le ditsamaiso tsa phapang ya maqhubu.
3. Bolelele ba leqhubu: E etselitsoe ho sutumelletsa matla a photon a attosecond ho lebanta la "fensetere ea metsi" bakeng sa ho nka litšoantšo tsa biomolecule. Litsela tse tharo tse kholo tsa theknoloji ke:
Ho eketsa matla a optical parametric (OPA) le cascade ea eona: Ke tharollo e kholo ho mefuta ea bolelele ba 1-5 μ m, ho sebelisoa likristale tse kang BiBO le MgO: LN; >Likristale tse kang ZGP le LiGaS ₂ lia hlokahala bakeng sa sehlopha sa bolelele ba 5 μ m.
Ho hlahisa maqhubu a fapaneng (DFG) le maqhubu a fapaneng a Intra Pulse (IPDFG): li ka fa mehloli ea peo botsitso ba CEP bo sa sebetseng.
Theknoloji ea laser e tobileng, joalo ka li-laser tsa Cr: ZnS/Se transition metal doped chalcogenide, e tsejoa e le "mid infrared titanium safire" 'me e na le melemo ea sebopeho se kopaneng le bokhoni bo phahameng.
4. Sekhahla se phahameng sa ho pheta-pheta: se reretsoeng ho ntlafatsa karolelano ea lets'oao-lerata le katleho ea ho fumana data, le ho sebetsana le mefokolo ea litlamorao tsa tefiso ea sebaka. Litsela tse peli tse ka sehloohong:
Theknoloji ea ho ntlafatsa li-cavity tsa resonance: ho sebelisa li-cavity tsa resonant tse nepahetseng haholo ho ntlafatsa matla a tlhoro ea li-pulse tsa maqhubu a pheta-phetoang a boemo ba megahertz ho khanna HHG, ho sebelisitsoe masimong a kang li-combs tsa maqhubu a XUV, empa ho hlahisa li-pulse tsa attosecond tse arohaneng ho ntse ho baka mathata.
Sekhahla se phahameng sa ho pheta-pheta lelaser e matla haholoHo kganna ka kotloloho, ho kenyeletswa OPCPA, fiber CPA e kopantsweng le kgatello ya post e seng ya mola, le oscillator e tshesane ya filimi, e fihlelletse tlhahiso ya pulse ya attosecond e arohaneng ka lebelo la ho pheta-pheta la 100 kHz.