Gushyuha kwa harmoniki ya kabiri mu buryo bwagutse

Gushyuha kwa harmoniki ya kabiri mu buryo bwagutse

Kuva aho havumburiwe ingaruka z’urumuri zidasanzwe mu myaka ya 1960, byakuruye amatsiko menshi y’abashakashatsi, kugeza ubu, hashingiwe ku ngaruka za kabiri za harmonic, n’ingaruka za frequency, byakozwe kuva ku zuba ryinshi cyane kugeza ku rumuri rwa kure rwa infrared rwaimirasire ya laser, byateje imbere cyane iterambere rya laser,itara ry'amasogutunganya amakuru, amashusho ya mikorosikopi afite ubushobozi bwo hejuru n'ibindi bice. Dukurikije nonlinearamatarana polarization theory, even-order nonlinear optical effect ifitanye isano rya hafi na crystal symmetry, kandi nonlinear coefficient si zeru gusa mu buryo butari hagati bwo guhindura ibintu. Nk'ingaruka z'ibanze zo mu buryo bwa kabiri bwo guhindura ibintu, harmonics ya kabiri ibangamira cyane ikorwa ryazo n'ikoreshwa ryazo neza muri fibre ya quartz kubera imiterere idahinduka n'uburinganire bwa inversion yo hagati. Kuri ubu, uburyo bwa polarization (optical polarization, thermal polarization, electric field polarization) bushobora gusenya mu buryo bw'ubukorano symmetry ya inversion yo hagati y'ibikoresho bya fibre ya optique, no kunoza neza nonlinearity ya kabiri ya fibre ya optique. Ariko, ubu buryo busaba ikoranabuhanga rigoye kandi risaba gutegura, kandi bushobora gusa guhuza imiterere ya quasi-phase ku bunini bw'uburebure butandukanye. Impeta ya optique resonant ishingiye ku buryo bwa echo wall igabanya gushyuha kwa harmonics ya kabiri. Mu guca uburinganire bw'imiterere y'ubuso bwa fibre, harmonics ya kabiri yo hejuru mu buryo bwihariye ya fibre yongerewe ku rugero runaka, ariko ikomeza kwishingikiriza ku muvuduko wa pompe ya femtosecond ifite imbaraga nyinshi cyane. Kubwibyo, gukora ingaruka z'urumuri zidasanzwe mu buryo bwa kabiri mu miterere ya fibre yose no kunoza imikorere y'impinduka, cyane cyane gukora harmonics za secondetroleum nyinshi mu gupompa optique ku ngufu nke, ni ibibazo by'ibanze bigomba gukemurwa mu rwego rwa fibre optique n'ibikoresho, kandi bifite akamaro kanini mu bya siyansi n'agaciro kanini k'ikoreshwa.

Itsinda ry’ubushakashatsi mu Bushinwa ryatanze igitekerezo cyo guhuza gallium selenide crystal phase igizwe n’ibice bya micro-nano. Binyuze mu kutagira umurongo wa kabiri ugororotse no gutondeka kure kwa gallium selenide crystals, hakorwa igikorwa cyo gukurura second harmonic hamwe no guhindura frequency nyinshi, bitanga igisubizo gishya cyo kunoza imikorere ya multi-parametric muri fibre no gutegura broadband second harmonic.amasoko y'urumuri. Gushyushya neza ingaruka ya kabiri ya harmonic na sum frequency muri gahunda ahanini biterwa n'ibintu bitatu by'ingenzi bikurikira: intera ndende y'imikoranire y'urumuri n'ibintu hagati ya gallium selenide nafibre ntoya, uburyo bwo kutagira umurongo wa kabiri n'uburyo bwo kureshya bwa kristale ya gallium selenide, hamwe n'imiterere y'uburyo bwo guhuza intera y'ibanze n'uburyo bwo gukuba kabiri byujuje ibisabwa.

Mu igerageza, fibre ya micro-nano yateguwe na sisitemu yo gupima umuriro ifite agace kamwe k’umuyoboro kangana na milimetero, gatanga uburebure burebure bw’igikorwa kitari umurongo ku ruhu rw’ipompe n’umuraba wa kabiri w’urumuri. Uburemere bwa polarizability butari umurongo ku ruhu rw’ipompe bwa gallium selenide burenze 170 pm/V, buruta cyane polarizability itari umurongo ku ruhu rw’ipompe. Byongeye kandi, imiterere ya crystal ya gallium selenide ikurikirana kure ituma harmonics ya kabiri ikomeza kubangamira, bigatuma uburebure bunini bw’igikorwa kitari umurongo ku ruhu rw’ipompe muri fibre ya micro-nano burushaho kuba bwiza. Icy'ingenzi kurushaho, guhuza phase hagati ya pompe optical base mode (HE11) na harmonic ya kabiri high order mode (EH11, HE31) bikorwa hakoreshejwe kugenzura umurambararo wa cone hanyuma hagakurikiraho kugenzura ikwirakwira ry’umuraba mu gihe cyo gutegura fibre ya micro-nano.

Ibikubiye haruguru ni byo bishyiraho urufatiro rwo gukurura neza no kwagutse kwa harmoniki ya kabiri muri fibre ya micro-nano. Igerageza ryerekana ko umusaruro wa harmoniki ya kabiri ku rwego rwa nanowatt ushobora kugerwaho munsi ya pompe ya laser ya picosecond pulse ya 1550 nm, kandi harmoniki ya kabiri ishobora no gukururwa neza munsi ya pompe ya laser ikomeza ifite uburebure bumwe, kandi imbaraga z'umupaka zikaba nkeya nka mikorowati magana menshi (Ishusho ya 1). Byongeye kandi, iyo urumuri rwa pompe rwongerewe ku burebure butatu butandukanye bwa laser ikomeza (1270/1550/1590 nm), harmoniki eshatu z'amasegonda (2w1, 2w2, 2w3) n'ibimenyetso bitatu bya frequency (w1+w2, w1+w3, w2+w3) bigaragarira kuri buri burebure butandatu bwa frequency conversion. Mu gusimbuza itara rya pompe n'urumuri rwa diode isohora urumuri rwinshi (SLED) hamwe n'umurambararo wa 79.3 nm, hakorwa harmonic ya kabiri ifite bandwidth ya 28.3 nm (Ishusho ya 2). Byongeye kandi, niba ikoranabuhanga ryo gushyira umwuka mu kirere rishobora gukoreshwa mu gusimbuza ikoranabuhanga ryo kohereza umuyaga mu buryo bwumye muri ubu bushakashatsi, kandi ibice bike bya kristu za gallium selenide bishobora guhingwa ku buso bwa fibre ya micro-nano mu ntera ndende, imikorere ya kabiri yo guhindura harmonic yitezwe ko izakomeza kunozwa.

ISHUSHO YA 1 Sisitemu ya kabiri yo gukora harmonic kandi igatanga imiterere ya fibre yose

Ishusho ya 2. Guhuza uburebure bwinshi bw'amabara n'amabara ya kabiri ya spectrum wide-spectrum munsi yo gupompa optique ku buryo buhoraho