Ukulinganiswa kobubanzi bomugqai-laser enobubanzi obuncane
Ububanzi bomugqa we-laser enobubanzi obuncane, ikakhulukazi obama-laser anemvamisa eyodwa, bubhekisela ebubanzini be-spectrum ye-laser (ngokuvamile ububanzi obuyisigamu kuya kububanzi obugcwele be-FWHM). Ngokuqondile, ububanzi bobuningi be-spectral yamandla ensimu kagesi ekhishwa imisebe buvezwa ngokwemvamisa, inombolo ye-wave noma ubude be-wavelength. Ububanzi bomugqa we-laser buhlobene kakhulu nesikhathi futhi bubonakala ngesikhathi sokuhambisana nobude bokuhambisana. Uma isigaba sidlula ekushintsheni okungenamkhawulo, khona-ke umsindo wesigaba udala ububanzi bomugqa, okuyinto eyenzeka nge-oscillator yamahhala. Ukuguquguquka kwesigaba okuvalelwe ngaphakathi kobubanzi besigaba esincane kakhulu kuholela kububanzi bomugqa obuyi-0 kanye ne-sideband ethile yomsindo. Ukususwa kobude be-resonant cavity nakho kunegalelo ebubanzini bomugqa futhi kukwenze kuncike esikhathini sokulinganisa. Lokhu kubonisa ukuthi ububanzi bomugqa noma ngisho nesimo se-spectrum (uhlobo lomugqa) akukwazi ukunikeza lonke ulwazi mayelanai-spectrum ye-laser.
Izindlela eziningi zingasetshenziswa ukukalaububanzi bomugqa we-laser:
Uma isilinganiso sobubanzi bomugqa sikhulu (>10GHz, lapho kukhona ukujikijelana kwemodi eminingi emihumeni ye-resonant yama-laser amaningi), i-spectrometer yendabuko esebenzisa i-diffraction grating ingasetshenziswa ukukala. Kunzima kakhulu ukuthola isixazululo semvamisa ephezulu ngokusebenzisa le ndlela.
Enye indlela ukusebenzisa i-frequency discriminator ukuguqula ukushintshashintsha kwemvamisa kube ukushintshashintsha kwamandla. I-discriminator ingaba i-interferometer engalingani noma i-reference cavity enembile kakhulu. Isixazululo sale ndlela yokulinganisa naso silinganiselwe kakhulu.
3. Ama-laser e-single-frequency ngokuvamile asebenzisa indlela ye-self-heterodyne, eqopha ukushaya phakathi kokukhipha kwe-laser kanye nayo ngokwayo ngemva kokususwa kwe-frequency kanye nokubambezeleka.
Uma ububanzi bomugqa bungamakhulu amaningana e-Hertz, inqubo yendabuko ye-heterodyne ayisebenzi ngoba ubude obukhulu bokulibaziseka buyadingeka ngalesi sikhathi. I-loop ye-cyclic fiber kanye ne-internal fiber amplifier zingasetshenziswa ukuyelula.
5. Isixazululo esiphezulu kakhulu singatholakala ngokuqopha ukushaya kwama-laser amabili azimele. Ngalesi sikhathi, umsindo we-laser yokubhekisela uphansi kakhulu kunowokuhlolwa.i-laser, noma izinkomba zokusebenza zalezi zibili ziyafana. Umehluko wemvamisa esheshayo ungatholakala ngokusebenzisa i-phase-locked loop noma ngokubala ngokusekelwe kumarekhodi ezibalo. Le ndlela ilula kakhulu futhi izinzile, kodwa idinga enye i-laser (esebenza eduze kwemvamisa ye-laser yokuhlola). Uma ububanzi bomugqa olinganisiwe budinga ububanzi obukhulu kakhulu be-spectral, kulula kakhulu ukusebenzisa i-frequency comb.
Ukulinganiswa kwemvamisa yokubona ngokuvamile kudinga ireferensi ethile yemvamisa (noma yesikhathi) ngesikhathi esithile. Ku-laser enobubanzi obuncane, kudingeka ukukhanya okukodwa kuphela kokubhekisela ukuze kunikezwe ireferensi enembile ngokwanele. Indlela ye-heterodyne ithola ireferensi yemvamisa ngokusebenzisa ukubambezeleka kwesikhathi eside ngokwanele kusuka kudivayisi yokuhlola uqobo. Okungcono kakhulu, igwema ukuhambisana kwesikhathi phakathi komsebe wokuqala nokukhanya kwayo okulibazisekile. Ngakho-ke, imicu ende yokubona ivame ukwamukelwa. Kodwa-ke, ngenxa yokuguquguquka okuzinzile nemiphumela ye-acoustic, imicu ende yokubona ingabangela umsindo wesigaba owengeziwe.
Isikhathi sokuthunyelwe: Disemba-08-2025