Ukulinganiswa kobubanzi bomgcai-laser enobubanzi obumxinwa
Ububanzi bomgca welaser enomgca omxinwa, ingakumbi obo beelaser ezine-frequency enye, bubhekisa kububanzi be-spectrum yelaser (ngokuqhelekileyo bububanzi obuphakathi ukuya kububanzi obupheleleyo be-FWHM). Ngokuchanekileyo, ububanzi boxinano lwamandla e-spectral yentsimi yombane ekhanyiswayo bubonakaliswa ngokwe-frequency, inombolo ye-wave okanye ubude be-wavelength. Ububanzi bomgca welaser bunolwalamano olusondeleyo kakhulu nexesha kwaye bubonakaliswa lixesha lokuvumelana kunye nobude bokuhambelana. Ukuba isigaba sidlula kutshintsho olungenamda, ke ingxolo yesigaba ivelisa ububanzi bomgca, okunjalo nge-oscillator ekhululekileyo. Ukuguquguquka kwesigaba okuvalelwe ngaphakathi koluhlu lwesigaba esincinci kakhulu kubangela ububanzi bemigca e-0 kunye nebhendi ethile yesandi. Ukususwa kobude be-resonant cavity kukwanegalelo kububanzi bomgca kwaye kuyenza ixhomekeke kwixesha lokulinganisa. Oku kubonisa ukuba ububanzi bomgca okanye nokuba yimilo ye-spectrum (uhlobo lomgca) ayinakubonelela lonke ulwazi malungai-spectrum yelaser.
Iindlela ezininzi zingasetyenziswa ukulinganisaububanzi bomgca welaser:
Xa umlinganiselo wobubanzi bomgca mkhulu (>10GHz, xa kukho ukushukuma kweendlela ezininzi kwimiqolo ye-resonant ye-laser ezininzi), i-spectrometer yendabuko esebenzisa i-diffraction grating ingasetyenziselwa ukulinganisa. Kunzima kakhulu ukufumana isisombululo se-frequency ephezulu ngokusebenzisa le ndlela.
Enye indlela kukusebenzisa i-frequency discriminator ukuguqula i-frequency fluctuations ibe yi-intensity fluctuations. I-discriminator ingaba yi-interferometer engalinganiyo okanye i-high-precision reference cavity. Isisombululo sale ndlela yokulinganisa naso sincinci kakhulu.
3. Iilaser ezine-frequency enye zihlala zisebenzisa indlela ye-self-heterodyne, erekhoda isantya phakathi kwemveliso yelaser kunye nayo emva kokucima i-frequency kunye nokulibaziseka.
Xa ububanzi bomgca bungamakhulu aliqela eHertz, indlela yendabuko ye-heterodyne ayisebenzi kuba ubude obukhulu bokulibaziseka buyadingeka ngeli xesha. I-cyclic fiber loop kunye ne-internal fiber amplifier zingasetyenziselwa ukuyandisa.
5. Isisombululo esiphezulu kakhulu sinokufezekiswa ngokurekhoda iingoma zeelaser ezimbini ezizimeleyo. Ngeli xesha, ingxolo yelaser ebhekisayo iphantsi kakhulu kuneyovavanyo.ileza, okanye izalathisi zokusebenza kwezi zimbini ziyafana. Umahluko wefrikhwensi ekhawulezileyo unokufumaneka ngokusebenzisa i-phase-locked loop okanye ngokubala ngokusekelwe kwiirekhodi zezibalo. Le ndlela ilula kakhulu kwaye izinzile, kodwa ifuna enye i-laser (esebenza kufutshane nefrikhwensi ye-laser yovavanyo). Ukuba ububanzi bomgca olinganisiweyo bufuna uluhlu olubanzi kakhulu lwe-spectral, kulula kakhulu ukusebenzisa i-frequency comb.
Ukulinganiswa kwefrikhwensi yokubona kudla ngokufuna ireferensi ethile yefrikhwensi (okanye ixesha) ngaxa lithile. Kwilaser enobubanzi obumxinwa, kufuneka ukukhanya okukodwa kuphela ukuze kubonelelwe ngokuchanekileyo. Indlela ye-heterodyne ifumana ireferensi yefrikhwensi ngokusebenzisa ukulibaziseka kwexesha elide ngokwaneleyo kwisixhobo sovavanyo ngokwaso. Ngokufanelekileyo, ithintela ukuhambelana kwexesha phakathi komqadi wokuqala kunye nokukhanya kwayo okulibazisekayo. Ke ngoko, iifayibha ezinde ze-optical zihlala zisetyenziswa. Nangona kunjalo, ngenxa yokuguquguquka okuzinzileyo kunye nemiphumo ye-acoustic, iifayibha ezinde ze-optical zinokubangela ingxolo eyongezelelweyo yesigaba.
Ixesha leposi: Disemba-08-2025