Fasahar tushen Laser don gano fiber na gani Kashi na Biyu

Fasahar tushen Laser don gano fiber na gani Kashi na Biyu

2.2 Zagaye mai tsawon zango ɗayatushen laser

Fahimtar amfani da laser mai tsawon tsayi ɗaya shine ainihin don sarrafa halayen zahiri na na'urar a cikinlaserrami (yawanci tsayin tsakiya na bandwidth ɗin aiki), don cimma iko da zaɓin yanayin tsayin daka mai juyawa a cikin ramin, don cimma manufar daidaita tsayin daka na fitarwa. Dangane da wannan ƙa'ida, tun farkon shekarun 1980, an cimma nasarar gano lasers ɗin fiber masu iya canzawa ta hanyar maye gurbin ƙarshen fuskar laser mai haske da grating mai haske, da kuma zaɓar yanayin ramin laser ta hanyar juyawa da daidaita grating ɗin diffraction da hannu. A cikin 2011, Zhu et al. sun yi amfani da matattara masu iya canzawa don cimma fitowar laser mai iya canzawa mai tsayi ɗaya tare da faɗin layi mai kunkuntar. A cikin 2016, an yi amfani da hanyar matse layin Rayleigh don matse tsawon wavelength biyu, wato, an yi amfani da damuwa ga FBG don cimma daidaitawar laser mai wavelength biyu, kuma an sa ido kan faɗin layin laser fitarwa a lokaci guda, inda aka sami kewayon daidaitawar tsawon wavelength na 3 nm. Fitar da tsayin wavelength biyu tare da faɗin layi kusan 700 Hz. A cikin 2017, Zhu et al. An yi amfani da graphene da micro-nano fiber Bragg grating don yin matattarar gani mai iya canzawa, kuma tare da fasahar rage laser na Brillouin, an yi amfani da tasirin photothermal na graphene kusa da 1550 nm don cimma faɗin layin laser mai ƙasa da 750 Hz da kuma scanning mai sauri da daidaito na 700 MHz/ms a cikin kewayon tsawon rai na 3.67 nm. Kamar yadda aka nuna a Hoto na 5. Hanyar sarrafa tsawon rai da ke sama tana gano zaɓin yanayin laser ta hanyar canza tsayin tsakiyar na'urar kai tsaye ko a kaikaice a cikin ramin laser.

Hoto na 5 (a) Saitin gwaji na tsawon tsayin da za a iya sarrafa shi ta hanyar gani-Laser mai iya canzawa ta fiberda kuma tsarin aunawa;

(b) Siffar fitarwa a fitarwa ta 2 tare da haɓaka famfon sarrafawa

2.3 Tushen hasken laser fari

Ci gaban tushen haske mai haske ya fuskanci matakai daban-daban kamar fitilar tungsten halogen, fitilar deuterium,Laser na semiconductorda kuma tushen hasken supercontinuum. Musamman ma, tushen hasken supercontinuum, ƙarƙashin motsin femtosecond ko picosecond tare da ƙarfin wucin gadi mai ƙarfi, yana samar da tasirin da ba na layi ba na tsari daban-daban a cikin jagorar waveguide, kuma ana faɗaɗa bakan sosai, wanda zai iya rufe bakan daga hasken da ake iya gani zuwa kusa da infrared, kuma yana da ƙarfi. Bugu da ƙari, ta hanyar daidaita watsawa da rashin layi na zare na musamman, ana iya faɗaɗa bakan sa zuwa tsakiyar bakan infrared. An yi amfani da wannan nau'in tushen laser sosai a fannoni da yawa, kamar su hoton haɗin kai na gani, gano iskar gas, hoton halittu da sauransu. Saboda iyakancewar tushen haske da matsakaici mara layi, farkon bakan supercontinuum galibi ana samar da shi ne ta hanyar gilashin laser mai ƙarfi don samar da bakan supercontinuum a cikin kewayon da ake iya gani. Tun daga lokacin, zaren gani ya zama matsakaici mai kyau don samar da bakan supercontinuum mai faɗi saboda babban ma'auninsa mara layi da ƙaramin filin yanayin watsawa. Babban tasirin da ba na layi ba sun haɗa da haɗakar raƙuman ruwa huɗu, rashin daidaiton daidaitawa, daidaitawar matakai na kai, daidaitawar matakai na giciye, rabuwar soliton, watsawar Raman, canjin mitar kai na soliton, da sauransu, kuma rabon kowane tasiri shi ma ya bambanta dangane da faɗin bugun bugun motsin rai da watsawar zare. Gabaɗaya, yanzu tushen hasken supercontinuum galibi yana nufin inganta ƙarfin laser da faɗaɗa kewayon spectral, da kuma kula da sarrafa haɗin kai.

Takaitawa 3

Wannan takarda ta taƙaita kuma ta yi bitar hanyoyin laser da aka yi amfani da su don tallafawa fasahar gano fiber, gami da laser mai faɗi da faɗi, laser mai canzawa sau ɗaya da kuma laser fari mai faɗi. An gabatar da buƙatun aikace-aikace da matsayin haɓaka waɗannan lasers a fagen gano fiber dalla-dalla. Ta hanyar nazarin buƙatunsu da matsayin haɓakawa, an kammala da cewa tushen laser mafi kyau don gano fiber zai iya cimma fitowar laser mai faɗi da tsayayye a kowane band da kowane lokaci. Saboda haka, muna farawa da faɗin layin laser mai faɗi, laser mai faɗi da haske mai haske mai faɗi da faifan riba mai faɗi, kuma muna gano hanya mai inganci don cimma tushen laser mafi kyau don gano fiber ta hanyar nazarin ci gaban su.