Aiwatar da na'urori masu daidaita haske na sararin samaniya zuwa hadadden hasken vortex

Fage

Ana ganin abubuwan al'ajabi a rayuwa, irin su juzu'i na baho da ke faruwa a lokacin da ake zubar da ruwa, tashin hankali da ke fita daga jiragen ruwa yayin da suke tafiya, guguwa, guguwa, da kewayar teku. Hasken Vortex (dauke da lokacin angular orbital angular, OAM) an fara gano shi kuma an yi amfani dashi musamman a fannin na'urorin gani, watau samar da vortex photons da vortex beams, kuma ra'ayin vortex biams aka fara gabatar da Coullet et al. a cikin 1989. A cikin 1922, L. Allen et al. bisa ka'ida ya tabbatar da kasancewar OAM a cikin vortex beams, wanda ya tura filin zuwa gaba a duniya.

Idan aka kwatanta da na al'ada guda daya-ring vortex haske, hadaddiyar vortex haske (COV) wani hadadden haske filin hade da mahara vortex fitilu, kuma don haka yana da mafi hadaddun da bambancin kaddarorin, wanda damar don ƙarin bambancin aikace-aikace m a fannoni daban-daban.

Misali, a cikin magudin barbashi, hadaddiyar hasken vortex na iya haifar da hasken haske tare da mabambantan kusurwoyi na orbital, yana ba da damar yin amfani da barbashi masu rikitarwa; a cikin sadarwa na gani, hadaddiyar hasken vortex na iya watsa ƙarin bayani a cikin hanya guda ɗaya, wanda ke da mahimmanci ga ci gaba da fadada ƙarfin sadarwa na gani.

A matsayin daya daga cikin manyan hanyoyin da za a iya daidaita filin gani, ana amfani da na'urori masu amfani da hasken sararin samaniya sosai a fannoni daban-daban saboda sauƙin aiki da ikon samar da tasirin hoto mai kyau, da kuma amfani da na'urorin hasken sararin samaniya don samar da hasken vortex yana da fa'ida mai fa'ida ta aikace-aikace a cikin hanyoyin sadarwa na gani da kuma sarrafa barbashi.

Abtract

Ƙwaƙwalwar gani shine katako mai tsayi mai tsayi mai tsayi tare da yanayin angular na orbital (OAM) wanda zai iya ɗaukar lambobi daban-daban na cajin topological. Ci gaba na baya-bayan nan a cikin binciken katako na vortex ya canza aikace-aikacen katako kamar su ci-gaban fasahar gani, sadarwa mai ƙarfi mai ƙarfi, da hoto mai ƙarfi. Babu shakka cewa vortex katako tsara da kuma gano hanyoyin da ake ganowa suna da mahimmanci ga aikace-aikacen katako na vortex.

Ƙa'idar ƙarni

Hanyoyin tsarar da suka dogara akan hasken sararin samaniya sun haɗa da hanyar farantin karkace, hanyar daidaita hasken sararin samaniya, hanyar grating holographic, da hanyar ruwan tabarau na shafi. Daga cikin su, na'ura mai daidaita haske ta sararin samaniya shine na'urar optoelectronic wanda zai iya daidaitawa wasu ko duk bayanan jiki kamar girman girman, lokaci, da yanayin polarization na igiyar haske.

Yin amfani da tasirin electro-optical na lu'ulu'u na ruwa, za'a iya gane na'urar hasken sararin samaniya don daidaita girman girman da lokaci na kalaman hasken abin da ya faru, ta yadda hasken hasken ya gane canjin gaban igiyar ruwa. Ana iya amfani da na'urar daidaita hasken sararin samaniya don ɗaukar hologram don samar da hasken vortex, ko zaɓi don shigar da bayanan lokaci daga farantin lokaci mai helical.

Ƙwayoyin wuta na Vortex masu dacewa da lambobi daban-daban na cajin topological (hoto daga ma'auni na cikin gida)

Ganewar gwaji

A cikin wannan gwaji, Laser da aka zaɓa don amfani da shi shine Laser He-Ne mai tsayin 632.8 nm. Ana nuna hanyar gani na gwaji a cikin hoton da ke ƙasa. Laser na farko yana wucewa ta tsarin yada katako mai hade don samar da wani babban tsari kusa da saman haske, sannan ya wuce ta hanyar polarizer kafin ya isa wurin na'urar hasken sararin samaniya, inda aka sanya garkuwar haske nan da nan a gaban na'urar daidaita hasken sararin samaniya.

Hasken Laser yana kaiwa ga na'urar daidaita hasken sararin samaniya bayan daidaita ƙarfin hasken ta abin rufe fuska. Bayan gyaran lokaci, laser yana nunawa zuwa wani polarizer, kuma ana iya lura da sakamakon gwaji bayan wannan polarizer. Anan, saboda wurin hoton na'urar modulator na sararin samaniya shine 15.36mm × 8.64mm, wanda ya fi girma fiye da wurin karɓar hoton CCD, CCD tana karɓar hoton ta hanyar tsarin 4f.

Na'urar gwaji

Mai sarrafa hasken sararin samaniya da aka yi amfani da shi a cikin wannan gwaji shine FSLM-2K70-P02, kuma manyan sigoginsa sune kamar haka:

Sakamako

(a) (d) yana nuna rarrabuwar hasken hasken da aka samar lokacin da cajin topological 2,5, -5,10, bi da bi.

Figures (a)(b) suna nuna inuwa guda biyu na karkace na zamani (ASPP) tare da faɗin zobe iri ɗaya amma radiyo daban-daban tare da cibiyoyi masu ɓoye. R1, r2 na biyun sune 1.2mm,2.4mm; 2.4mm, 3.6mm, bi da bi.

Figures (c) (d) suna nuna hotunan da aka samu ta hanyar saita cajin topological na na'urar daidaita hasken sararin samaniya zuwa 2 da kuma sanya mashin haske daban-daban a gaban na'urar daidaita hasken sararin samaniya. Figures (e) (f) suna nuna hotunan da aka gani bayan saita lambar cajin topological zuwa 10.

Hoto (a) yana nuna inuwar na'urar samar da hasken vortex.

Hoto (b) yana nuna rarrabuwar hasken haske da aka samar lokacin da cajin topological na ciki da na waje ya kasance 1 da 3, bi da bi.

Hoto (c) yana nuna rarrabuwar hasken haske lokacin da lambar cajin topological ta kasance akai kuma an cire tsiri mara kyau.

Hoto (d) yana nuna rarrabuwar hasken haske bayan an kiyaye cajin topological akai-akai kuma an maye gurbin tsiri da na zahiri.

Figures (e) da (f) suna nuna rarrabuwar hasken haske da aka haifar lokacin da cajin topological na ciki da na waje ya kasance 5,1; 20,1, bi da bi.

Kammalawa

Ana samun daidaitawar ƙarfin haske da lokaci ta hanyar haɗa abin rufe fuska mai haske da mai daidaita haske na sararin samaniya-nau'i, da ikon na'urar samar da hasken wutar lantarki mai haɗaka don samar da COVs da halayensa an tabbatar da su ta hanyar gwaji, da halaye na farantin lokaci mai karkata (SPP), da farantin haske na annular karkace (ASPP) a cikin samar da vortex haske.

Na'urar samar da hasken vortex mai hade da aka tsara a cikin wannan takarda na iya samar da kowane adadin zoben da aka tattara bisa ga buƙatun amfani. Wannan hadadden hasken vortex zai sami aikace-aikace da yawa a fagen sadarwa na gani da sarrafa barbashi.