Ukuvuselelwa kwe-harmonics yesibili ku-spectrum ebanzi

Ukuvuselelwa kwe-harmonics yesibili ku-spectrum ebanzi

Kusukela ukutholwa kwemiphumela yoku-oda yesibili engekho emthethweni ngawo-1960, kuye kwavuselela intshisekelo enkulu yabaphenyi, kuze kube manje, kususelwa kuma-harmoniolet wesibili, futhi kukhiqizwe kusuka ku-ultraviolet eyeqisayo kuya kwi-band engemuva kwe-infrared ye-infrared ye-infrared yeamachweba, wakhuthaza kakhulu ukuthuthukiswa kwe-laser,-phathelene nokubonaUkucutshungulwa kwemininingwane, ukucabanga okuphezulu kwesimo sama-microscopic kanye nezinye izinkambu. Ngokuya nge-nonlinearama-opticsFuthi i-polarization theory, i-oda le-oda le-nonlinear aptical lihlobene kakhulu nokuvumelanisa kwe-crystal, futhi i-coefficial engeyona eye-nonlinear akuyona zero kuphela kwabezindaba ze-infversic ezingezona ezingemuva. Njengomphumela ongesisekelo we-Oder-oda we-ORELINE, i-harmonics yesibili ikuvimbela kakhulu isizukulwane sazo nokusebenzisa ngempumelelo ku-quartz fiber ngenxa yefomu le-amorphous kanye nokuvumelanisa kokuphambuka kwesikhungo. Njengamanje, izindlela ze-polarization (polarization we-optical, i-polarization ye-thermal, i-callarization ye-Electric Field) ingabhubhisa ngokulingana kokungenisa izikhungo zezinto ezibonakalayo, futhi ngempumelelo ithuthukise i-nongline-oda le-fiber optical. Kodwa-ke, le ndlela idinga ubuchwepheshe obuyinkimbinkimbi futhi idinga ubuchwepheshe bokulungiselela, futhi ingahlangabezana kuphela nemibandela yokuqhathanisa isigaba se-quasi. Indandatho ye-Fiber Resonant ebonakalayo esekelwe kwimodi yodonga lwe-echo Ngokwephula ukuvumelanisa kwesakhiwo se-fiber, i-harmonics yesibili ekwakhiweni kwesakhiwo esikhethekile ithuthukiswa ngezinga elithile, kepha isancike kumaphampu we-femtosecond wamaphampu aphezulu kakhulu. Ngakho-ke, isizukulwane se-oda lesibili le-Optical Enlounts ezinhlakeni ze-fiber ezingezinkomo kanye nokwenza ngcono ukuguqulwa kokusebenza kahle, ikakhulukazi isizukulwane se-main-spectrum yesibili i-harmonics emandleni aphansi, futhi yizinkinga eziyisisekelo ezidinga ukuxazululwa emkhakheni we-nonlinear fiber kanye namadivayisi, futhi zibe nokubaluleka kwesayensi kanye nenani elibalulekile lesicelo.

Iqembu labacwaningi eChina lihlongoze isikimu sokuhlanganisa isigaba se-gallium selemide crystal crystal nge-micro-nano fiber. Ngokusebenzisa ngokunenzuzo okungelona i-oda le-oda lesibili kanye nokuhleleka okude kwamakristalu e-gallium selenide, ukuthokozela okubanzi kwe-spectrum kanye nokuguqulwa okuningana kwenqubo yokuthuthukiswa kwezindlela eziningi ze-fiber kanye nokulungiswa kwe-broadband yesibiliImithombo ekhanyayo. Ukuvuselelwa okusebenzayo komphumela wemvamisa wesibili kanye ne-sum ku-Scheme ikakhulukazi kuya ngezimo ezintathu ezilandelayo ezilandelayo: ibanga lokuxhumana elingu-Light Light-Light Seletide kanyeI-Micro-Nano Fibre, i-oda eliphakeme le-oda lesibili kanye ne-oda elide le-gallium lelenide crystal, kanye nesigaba ukuqhathanisa izimo zemvamisa eyisisekelo ne-frequency ukuphindaza ngemodi yenelisekile.

Esivivinyweni, i-fiber ye-micro-nano elungiselelwe yi-flame scanning tapering system inesifunda se-coner cone efanayo ngokulandelana kwama-millimeter, okuhlinzeka ngezinyathelo ezinde ezingezinhle zokukhanya kwepompo kanye negagasi lesibili le-harmonic. Ubumbano lwe-oda lwesibili lwe-nonlinear lwe-Gallium Selenide Crystal Crystal ehlanganisiwe yeqa ngo-170 PM / V, okuphakeme kakhulu kunokuba nobumbano olungaphakathi lwe-fiber. Ngaphezu kwalokho, ukwakheka okude okuyala kwe-Gallium Selenide Crystal kuqinisekisa ukuphazamiseka okuqhubekayo kwesigaba se-harmonics yesibili, ukunika ukudlala okugcwele ukuze kusizakale ubude besenzo se-micro-nano. Okubaluleke kakhulu, isigaba esihambelana phakathi kwemodi ye-Pumperical Optical Base yemodi (He11) kanye nemodi yesibili ye-Harmonic High Order Mode (EH11, He31) iyabonakala ngokulawula ububanzi besigaxa bese ilawulwa ukuhanjiswa kwe-waveguide ngesikhathi sokulungiswa kwe-micro-nano fiber.

Lezi zimo ezingenhla zibeka isisekelo sokuvuselelwa okusebenzayo nokwamabhele okubanzi kwe-harmonics yesibili ku-micro-nano fiber. Ukuhlolwa kukhombisa ukuthi umphumela we-harmonics wesibili ku-Nanowatt Level angatholakala ngaphansi kwe-1550 NM Picosecond Pulse Pulse Pump, futhi i-harmonics yesibili nayo ingahle ijabule kahle ngaphansi kwe-microwatts eyikhulu (Umdwebo 1). Ngaphezu kwalokho, lapho ukukhanya kwepompo kunwetshwa kuma-wavelength amathathu ahlukene we-laser eqhubekayo (1270/1550/1590 NM), i-w1 + w3, w1 + w3, i-W1 + W3) ibonwa ngakunye kwamagagasi ayisithupha wokuguqula imvamisa. Ngokufaka esikhundleni sokukhanya kwepompo nge-diode ekhanyayo ye-ultra-emnandi ekhanyayo (esikhaleni) nge-bandwidth ka-79.3 nm, i-harmonic ebanzi yesibili nge-bandwidth ka-28.3 nm yenziwa (Umdwebo 2). Ngaphezu kwalokho, uma ubuchwepheshe be-Chemical Vapor Developgen bungasetshenziselwa ukubuyisela ubuchwepheshe bokudlulisa owomile kulolu cwaningo, futhi izingqimba ezimbalwa ze-Gallium Selenide Crystals zingatshalwa ebusweni be-Micro-Nano fiber ngamabanga amade, kulindeleke ukuthi kube ngcono ukuguqulwa kwe-Harmoninic.

Fig. Uhlelo olu-1 lwesibili lwe-harmonic isizukulwane futhi imiphumela yesakhiwo se-fiber all

Umdwebo 2 Multi-Wavelength oxubile kanye ne-wide-spectrum Second Harmonics ngaphansi kokuphonsa okuqhubekayo okuqhubekayo