Uchulumanco lwee-harmonics zesibini kwi-spectrum ebanzi

Uchulumanco lwee-harmonics zesibini kwi-spectrum ebanzi

Ukususela ekufunyanweni kweempembelelo ze-optical ze-second-order nonlinear kwi-1960s, kuye kwavusa umdla obanzi wabaphandi, ukuza kuthi ga ngoku, ngokusekelwe kwi-harmonic yesibini, kunye nemiphumo ye-frequency, ivelise kwi-ultraviolet egqithisileyo ukuya kwi-infrared band ye-infrared.iilaser, ikhuthaze kakhulu ukuphuhliswa kwelaser,ukubonaukusetyenzwa kolwazi, i-high-resolution imaging microscopic kunye neminye imimandla. Ngokutsho nonlinearopticskunye ne-polarization theory, i- even-order nonlinear optical effect ihambelana ngokusondeleyo ne-crystal symmetry, kwaye i-coefficient engabonakaliyo ayikho i-zero kuphela kwi-non-central inversion symmetric media. Njengeyona nto isisiseko ye-second-order nonlinear effect, i-harmonics yesibini ithintela kakhulu isizukulwana sabo kunye nokusetyenziswa okusebenzayo kwi-quartz fiber ngenxa yefom ye-amorphous kunye ne-symmetry ye-inversion yeziko. Okwangoku, iindlela ze-polarization (i-polarization ye-optical, i-thermal polarization, i-polarization ye-electric field polarization) inokutshabalalisa ngokufanelekileyo i-symmetry ye-inversion yeziko lezinto ezibonakalayo ze-fiber optical, kwaye iphucule ngokufanelekileyo i-second-order nonlinearity ye-fiber optical. Nangona kunjalo, le ndlela ifuna itekhnoloji entsonkothileyo kwaye ifuna itekhnoloji yokulungiselela, kwaye inokuhlangabezana kuphela neemeko ezihambelana nenqanaba elilinganayo kumaza amaza. Iringi ye-fiber resonant esekwe kwimowudi yodonga lwe-echo inqanda i-excitation ye-spectrum ebanzi ye-harmonics yesibini. Ngokwaphula i-symmetry yesakhiwo somphezulu wefiber, i-harmonics yesibini ephezulu kwi-fiber yesakhiwo esikhethekileyo iphuculwe kwinqanaba elithile, kodwa ixhomekeke kwi-pulse yepompo ye-femtosecond enamandla aphezulu kakhulu. Ngoko ke, ukuveliswa kweziphumo ze-optical ze-second-order nonlinear opticals kuzo zonke izakhiwo ze-fiber kunye nokuphuculwa kokuguqulwa kokuguqulwa, ngokukodwa ukuveliswa kwe-harmonics ye-wide-spectrum yesibini kumandla aphantsi, ukumpompa okubonakalayo okuqhubekayo, ziingxaki ezisisiseko ezifuna ukusonjululwa kwintsimi ye-fiber optics kunye nezixhobo ezingabonakaliyo, kwaye zinentsingiselo ebalulekileyo yesayensi kunye nexabiso lesicelo esibanzi.

Iqela lophando e-China licebise i-gallium selenide isigaba sokuhlanganiswa kwe-crystal kunye ne-micro-nano fiber. Ngokusebenzisa i-high-second-order nonlinearity kunye ne-long-range order order of gallium selenide crystals, i-wide-spectrum ye-second-harmonic excitation kunye nenkqubo yokuguqulwa kwe-multi-frequency iyenzeka, ibonelela ngesisombululo esitsha sokuphucula iinkqubo ezininzi ze-parametric kwifiber kunye nokulungiswa kwe-broadband yesibini-harmonic.imithombo yokukhanya. Uchulumanco olusebenzayo lwesiphumo sesibini se-harmonic kunye nesiphumo se-frequency kwisikimu ikakhulu sixhomekeke kwezi meko zintathu zilandelayo: umgama omde wokudibana wokukhanya phakathi kwe-gallium selenide kunyei-micro-nano fiber, i-second-order high-nonlinearity kunye ne-long-range order of the layered gallium selenide crystal, kunye neemeko ezihambelana nesigaba se-frequency kunye nemo yokuphindaphinda kabini iyaneliseka.

Kuvavanyo, i-micro-nano fiber elungiselelwe yinkqubo ye-flame scanning tapering inommandla ofanayo we-cone ngokulandelelana kwe-millimeter, ebonelela ngobude obude besenzo esingenasiphelo sokukhanya kwempompo kunye ne-harmonic wave yesibini. I-polarzability yesibini engabonakaliyo ye-crystal edibeneyo ye-gallium selenide idlula i-170 pm / V, ephakamileyo kakhulu kune-intrinsic nonlinear polarizability ye-fiber optical. Ngaphezu koko, ulwakhiwo olude oluyalelweyo lwe-gallium selenide crystal luqinisekisa ukuphazamiseka kwesigaba esiqhubekayo se-harmonics yesibini, ukunika umdlalo ogcweleyo kwinzuzo yobude besenzo esingenasiphelo kwi-micro-nano fiber. Okubaluleke ngakumbi, ukuhambelana kwesigaba phakathi kwemowudi yesiseko sokupompa (HE11) kunye nemowudi yesibini ye-harmonic yomyalelo ophezulu (EH11, HE31) ifunyenwe ngokulawula i-cone diameter kwaye ilawula ukusasazeka kwe-waveguide ngexesha lokulungiswa kwe-micro-nano fiber.

Le miqathango ingentla ibeka isiseko se-excitation esebenzayo kunye nebanzi-band ye-harmonics yesibini kwi-micro-nano fiber. Uvavanyo lubonisa ukuba imveliso ye-harmonics yesibini kwinqanaba le-nanowatt inokufezekiswa phantsi kwempompo ye-laser ye-picosecond ye-1550 nm, kunye ne-harmonics yesibini nayo inokuvuyiswa ngokufanelekileyo phantsi kwempompo ye-laser eqhubekayo yobude obufanayo, kwaye amandla embundwini aphantsi njengama-microwatts angamakhulu amaninzi (Umfanekiso 1). Ukuqhubela phambili, xa ukukhanya kwempompo kwandiselwa ukuya kumaza amathathu ahlukeneyo e-laser eqhubekayo (1270/1550/1590 nm), ii-harmonics ezintathu zesibini (2w1, 2w2, 2w3) kunye neempawu ezintathu zesambuku (w1+w2, w1+w3, w2+w3) zibonwa kwi-conversion yamaza amaza amathandathu. Ngokutshintsha ukukhanya kwempompo kunye ne-ultra-radiant light-emitting diode (SLED) umthombo wokukhanya kunye ne-bandwidth ye-79.3 nm, i-wide-spectrum yesibini i-harmonic kunye ne-bandwidth ye-28.3 nm yenziwe (Figure 2). Ukongeza, ukuba itekhnoloji yokubeka umphunga wekhemikhali ingasetyenziselwa ukutshintsha itekhnoloji yokudlulisa okomileyo kolu phononongo, kwaye iileya ezimbalwa ze-gallium selenide crystals zinokukhuliswa kumphezulu we-micro-nano fiber kwimigama emide, ukuguqulwa kwe-harmonic yesibini esebenzayo kulindeleke ukuba kuphuculwe ngakumbi.

IKHIWANE. 1 Inkqubo yesibini yokuvelisa i-harmonic kunye neziphumo kwisakhiwo se-fiber yonke

Umzobo 2 Umxube wobude obuninzi kunye nobubanzi obubanzi be-harmonics yesibini phantsi kokumpompa okubonakalayo.