Ukuvuselela iiharmoniki zesibini kuluhlu olubanzi

Ukuvuselela iiharmoniki zesibini kuluhlu olubanzi

Ukusukela oko kwafunyanwa iziphumo ze-optical ezingezizo ze-second-order ngo-1960, kuye kwavusa umdla omkhulu wabaphandi, ukuza kuthi ga ngoku, ngokusekelwe kwi-harmonic yesibini, kunye neziphumo ze-frequency, ezivelise ukusuka kwi-ultraviolet extreme ukuya kwi-far infrared band yeiileyiza, ikhuthaze kakhulu uphuhliso lwe-laser,i-opticalukucutshungulwa kolwazi, imifanekiso yemicroscope enesisombululo esiphezulu kunye nezinye iinkalo. Ngokwe-nonlineari-opticskunye nethiyori ye-polarization, isiphumo se-optical esi-even-order nonlinear sinxulumene ngokusondeleyo ne-crystal symmetry, kwaye i-nonlinear coefficient ayisiyo-zero kuphela kwi-non-central inversion symmetric media. Njengesiphumo esisisiseko se-second-order nonlinear, ii-harmonics zesibini zithintela kakhulu ukuveliswa kwazo kunye nokusetyenziswa kwazo ngokufanelekileyo kwi-quartz fiber ngenxa yesimo esingaguqukiyo kunye nokulingana kwe-center inversion. Okwangoku, iindlela ze-polarization (i-optical polarization, i-thermal polarization, i-electric field polarization) zinokutshabalalisa ngokungekho mthethweni i-symmetry ye-material center inversion ye-optical fiber, kwaye ziphucule ngokufanelekileyo i-second-order nonlinearity ye-optical fiber. Nangona kunjalo, le ndlela ifuna itekhnoloji yokulungiselela enzima nefuna umgudu, kwaye inokuhlangabezana kuphela neemeko zokufanisa ze-quasi-phase kwii-wavelengths ezihlukeneyo. I-optical fiber resonant ring esekelwe kwi-echo wall mode ithintela i-wide spectrum excitation ye-second harmonics. Ngokuphula i-symmetry yesakhiwo somphezulu we-fiber, ii-surface second harmonics kwi-special structure fiber ziyaphuculwa ukuya kwinqanaba elithile, kodwa zisaxhomekeke kwi-pulse ye-femtosecond pump enamandla aphezulu kakhulu. Ngoko ke, ukuveliswa kweziphumo ze-optical ezingezizo eze-second-order kwizakhiwo ze-all-fiber kunye nokuphuculwa kokusebenza kakuhle kokuguqulwa, ingakumbi ukuveliswa kwe-wide-spectrum second harmonics kwi-low-power, continuous optical pumping, ziingxaki ezisisiseko ekufuneka zisonjululwe kwicandelo le-nonlinear fiber optics kunye nezixhobo, kwaye zibaluleke kakhulu kwezesayensi kunye nexabiso elibanzi lokusetyenziswa.

Iqela lophando eTshayina licebise isicwangciso sokudibanisa isigaba sekristale se-gallium selenide esineengqimba kunye ne-micro-nano fiber. Ngokusebenzisa ithuba lokungahambelani kwe-second-order ephezulu kunye nokulandelelana okude kweekristale ze-gallium selenide, inkqubo yokuvuselela i-second-harmonic ebanzi kunye nenkqubo yokuguqula i-multi-frequency iyafezekiswa, ibonelela ngesisombululo esitsha sokuphucula iinkqubo ze-multi-parametric kwi-fiber kunye nokulungiselela i-broadband second-harmonic.imithombo yokukhanya. Ukuvuselelwa okusebenzayo kwesiphumo sesibini se-harmonic kunye ne-sum frequency kwiskimu kuxhomekeke kakhulu kwezi meko zintathu zilandelayo: umgama omde wokunxibelelana kokukhanya-into phakathi kwe-gallium selenide kunyeifayibha encinci ye-nano, ukungangqamani komgca wesibini ophezulu kunye nomyalelo womgama omde wekristale ye-gallium selenide enamaleko, kunye neemeko zokufanisa isigaba sendlela yokuphindaphinda i-basic frequency kunye ne-frequency ziyaneliswa.

Kolu vavanyo, i-micro-nano fiber elungiselelwe yinkqubo yokuskena ilangatye inommandla wekhowuni ofanayo ngokomyalelo we-millimeter, obonelela ngobude besenzo obude obungengomgca welanga kwisibane sepompo kunye ne-harmonic wave yesibini. I-second-order nonlinear polarizability ye-integrated gallium selenide crystal idlula i-170 pm/V, ephezulu kakhulu kune-intrinsic nonlinear polarizability ye-optical fiber. Ngaphezu koko, isakhiwo esicwangcisiweyo se-long-range se-gallium selenide crystal siqinisekisa ukuphazamiseka okuqhubekayo kwe-second harmonics, okunika ukudlala okupheleleyo kwinzuzo yobude besenzo obukhulu obungengomgca welanga kwi-micro-nano fiber. Okubaluleke ngakumbi, ukufanisa isigaba phakathi kwe-pumping optical base mode (HE11) kunye ne-second harmonic high order mode (EH11, HE31) kufezekiswa ngokulawula ububanzi bekhowuni uze ulawule ukusasazeka kwe-waveguide ngexesha lokulungiselela i-micro-nano fiber.

Ezi meko zingasentla zibeka isiseko sokuvuthuza okusebenzayo nokubanzi kwe-harmonics yesibini kwi-micro-nano fiber. Olu vavanyo lubonisa ukuba imveliso ye-harmonics yesibini kwinqanaba le-nanowatt inokufezekiswa phantsi kwe-1550 nm picosecond pulse laser pump, kwaye i-harmonics yesibini nayo inokuvuselelwa ngokufanelekileyo phantsi kwe-constant laser pump yobude obufanayo, kwaye amandla omyinge aphantsi njenge-microwatts ezingamakhulu aliqela (Umfanekiso 1). Ngaphezu koko, xa ukukhanya kwepompo kwandiswa ukuya kwii-wavelengths ezintathu ezahlukeneyo ze-constant laser (1270/1550/1590 nm), ii-harmonics ezintathu zesibini (2w1, 2w2, 2w3) kunye nezibonakaliso ezintathu ze-sum frequency (w1+w2, w1+w3, w2+w3) zibonwa kwi-wavelengths nganye ye-frequency conversion wavelengths ezintandathu. Ngokutshintsha isibane sepompo nge-ultra-radiant light-emitting diode (SLED) light source ene-bandwidth ye-79.3 nm, kwenziwa i-wide-spectrum second harmonic ene-bandwidth ye-28.3 nm (Umfanekiso 2). Ukongeza, ukuba iteknoloji ye-chemical vapor deposition ingasetyenziselwa ukuthatha indawo yeteknoloji yokudlulisa okomileyo kolu phononongo, kwaye iileya ezimbalwa ze-gallium selenide crystals zinokukhuliswa kumphezulu we-micro-nano fiber kumgama omde, ukusebenza kakuhle kwe-harmonic conversion yesibini kulindeleke ukuba kuphuculwe ngakumbi.

UMZOBO 1 Inkqubo yesibini yokuvelisa i-harmonic kunye neziphumo kwisakhiwo se-all-fiber

Umfanekiso 2 Ukuxuba ubude bamaza amaninzi kunye neeharmoniki zesibini ze-wide-spectrum phantsi kokumpompa okubonakalayo okuqhubekayo