Sub-20 femtosekond igaragara yumucyo uhindagurika pulsed laser isoko

Sub-20 femtosekond urumuri rugaragaratunable pulsed laser isoko

Vuba aha, itsinda ry’ubushakashatsi ryaturutse mu Bwongereza ryasohoye ubushakashatsi bushya, ritangaza ko ryateje imbere megawatt yo mu rwego rwa sub-20 femtosekond igaragara yumucyo ushobora kugaragaraisoko ya laser. Inkomoko ya laser isoko, ultrafastlasersisitemu ishoboye kubyara pulses hamwe nuburebure bwumurongo, uburebure bwigihe gito, ingufu zingana na nanojoules 39, nimbaraga zo hejuru zirenga megawatt 2, zifungura uburyo bushya bwo gukoresha imirima nka ultrafast spectroscopy, amashusho y’ibinyabuzima, hamwe no gutunganya inganda.

Ikintu cy'ingenzi cyaranze iri koranabuhanga kiri mu guhuza uburyo bubiri bugezweho: “Kunguka-Gucungwa na Amplification idafite umurongo (GMNA)” na “Resonant Dispersive Wave (RDW)”. Mubihe byashize, kugirango tubone imbaraga zidasanzwe zo guhinduranya ultrashshort pulses, zihenze kandi zigoye za titanium-safiro cyangwa lazeri ya optique ya optique. Ibi bikoresho ntabwo byari bihenze gusa, binini, kandi bigoye kubungabunga, ariko kandi byagarutsweho nigipimo gito cyo gusubiramo no kugereranya. Ibisubizo byose bya fibre byakozwe muriki gihe ntabwo byoroshya gusa imiterere yububiko ariko binagabanya cyane ibiciro nibigoye. Ifasha ibisekuru bitaziguye bya sub-20 femtosekond, bihwanye na nanometero 400 kugeza 700 kandi birenze imbaraga za pulses nyinshi kuri repetition nyinshi ya 4.8 MHz. Itsinda ryubushakashatsi ryageze kuriyi ntera binyuze muburyo bwububiko bwa sisitemu. Ubwa mbere, bakoresheje polarisiyasi yuzuye-uburyo bwo gufunga ytterbium fibre oscillator ishingiye ku ndorerwamo idafite umurongo wa amplification impeta (NALM) nkisoko yimbuto. Igishushanyo nticyerekana gusa igihe kirekire sisitemu ihamye, ariko kandi irinda ikibazo cyo kwangirika kwimitsi yuzuye. Nyuma yo kubanziriza no guhagarika impiswi, imbuto zimbuto zinjizwa murwego rwa GMNA. GMNA ikoresha icyiciro cya modulasiyo hamwe na asimmetrike yunguka ikwirakwizwa muri fibre optique kugirango igere kwaguka kandi itange ultrashort pulses hamwe na chirp yumurongo utunganijwe neza, amaherezo ikomekwa kuri femtosekondi munsi ya 40 ikoresheje gusya. Mugihe cyibisekuru bya RDW, abashakashatsi bifashishije ubwabo kandi bakora icyenda-resonator anti-resonance hollow-core fibre. Ubu bwoko bwa fibre optique ifite igihombo gito cyane mumashanyarazi ya pompe no mukarere kagaragara k'umucyo, bigatuma ingufu zishobora guhinduka neza kuva pompe ikajya kumuraba watatanye kandi ikirinda kwivanga kwatewe na bande ya resonant yatakaye cyane. Mugihe gikwiye, imbaraga zo gukwirakwiza imbaraga za sisitemu zishobora kugera kuri 39 nanojoules, ubugari bugufi bwa pulse bushobora kugera kuri femtosekond 13, imbaraga zo hejuru zishobora kuba megawatt 2,2, kandi imbaraga zo guhindura ingufu zishobora kugera kuri 13%. Ndetse igishimishije kurushaho ni uko muguhindura ingufu za gaze hamwe nibipimo bya fibre, sisitemu irashobora kwaguka byoroshye kuri ultraviolet na infrarafarike, bikagera kumurongo mugari kuva ultraviolet ikagera kuri infragre.

Ubu bushakashatsi ntabwo bufite akamaro kanini gusa mubikorwa byibanze bya fotonike, ariko kandi bufungura ibintu bishya mubikorwa byinganda n’inganda. Kurugero, mubice nka microscopi yerekana amashusho menshi, ultrafast igihe cyakemuwe na spekitroscopi, gutunganya ibikoresho, ubuvuzi bwuzuye, hamwe nubushakashatsi bwa ultrafast nonlinear optique, ubu buryo bworoshye, bukora neza, kandi buhendutse buhendutse bwubwoko bushya bwumucyo utanga amashanyarazi kubakoresha ibikoresho bitigeze bibaho kandi byoroshye. By'umwihariko muri ssenariyo isaba igipimo cyinshi cyo gusubiramo, imbaraga zimpanuka na ultra-short pulses, ntagushidikanya ko iri koranabuhanga rirushanijwe kandi rifite amahirwe menshi yo kuzamura ugereranije na titanium-safiro gakondo cyangwa optique ya parametric amplification sisitemu.

Mu bihe biri imbere, itsinda ry’ubushakashatsi rirateganya kurushaho kunoza sisitemu, nko guhuza imyubakire yubu irimo ibintu byinshi byubusa-optique igizwe na fibre optique, cyangwa no gukoresha oscillator imwe ya Mamyshev kugirango isimbuze oscillator iriho hamwe na amplifier, kugirango igere kuri miniaturizasi no guhuza sisitemu. Mubyongeyeho, muguhuza nubwoko butandukanye bwa anti-resonance fibre, kumenyekanisha imyuka ya Raman hamwe na modul ikubye inshuro ebyiri, iyi sisitemu iteganijwe kwagurwa mugice kinini, itanga fibre-fibre, Broadband, ultrafast laser ibisubizo kumirima myinshi nka ultraviolet, urumuri rugaragara na infragre.

Igishushanyo 1. Igishushanyo mbonera cyo guhuza lazeri