Narrow Linewidth Laser Technology Ingxenye Yesibili
Ngo-1960, i-laser ye-ruby yokuqala emhlabeni kwakuyi-laser yesimo esiqinile, ebonakala ngamandla aphumayo aphezulu kanye nokufakwa kwe-wavelength ebanzi. Isakhiwo esiyingqayizivele sendawo ye-solid-state laser siyenza ivumelane nezimo ekwakhiweni kokukhiphayo kobubanzi obuncane bomugqa. Njengamanje, izindlela eziyinhloko ezisetshenziswayo zifaka indlela yesikhala esifushane, indlela yomgodi wendandatho yendlela eyodwa, indlela evamile ye-intracavity, indlela ye-torsion pendulum mode cavity, indlela ye-volume Bragg grating kanye nendlela yokujova imbewu.
Umfanekiso wesi-7 ubonisa ukwakheka kwama-lasers wesimo esiqinile semodi eyodwa yobude.
Umfanekiso wesi-7(a) ubonisa isimiso sokusebenza sokukhethwa kwemodi eyodwa yobude obusekelwe kuzinga le-FP engaphakathi emgodini, okungukuthi, i-spectrum yokudlulisa yomugqa omncane obanzi wezinga isetshenziselwa ukwandisa ukulahleka kwezinye izindlela ze-longitudinal, ukuze ezinye izindlela ze-longitudinal. zihlungwa enqubweni yokuncintisana yemodi ngenxa yokudlulisa okuncane, ukuze kuzuzwe ukusebenza kwemodi eyodwa ye-longitudinal. Ngaphezu kwalokho, uhla oluthile lokuphuma kokulungisa amaza lungatholakala ngokulawula i-Engeli nezinga lokushisa lezinga le-FP nokushintsha isikhawu semodi ye-longitudinal. I-FIG. I-7(b) kanye (c) ibonisa i-oscillator yeringi engahleliwe (NPRO) kanye nendlela ye-torsional pendulum mode cavity esetshenziselwa ukuthola ukuphuma kwemodi eyodwa ye-longitudinal. Umgomo wokusebenza uwukwenza ugongolo lusakazeke ohlangothini olulodwa ku-resonator, kuqedwe ngokuphumelelayo ukusatshalaliswa kwendawo okungalingani kwenani lezinhlayiya ezihlehlisiwe endaweni evamile yokuma kwamagagasi, futhi ngaleyo ndlela kugwenywe ithonya lomphumela wokushiswa kwembobo yendawo ukuze kuzuzwe okukhiphayo kwemodi eyodwa yobude. Isimiso sokukhetha imodi ye-Bragg grating (VBG) ngobuningi siyefana nesemiconductor nefibre emincane yobubanzi bomugqa welaser okukhulunywe ngayo ngaphambili, okungukuthi, ngokusebenzisa i-VBG njengento yokuhlunga, ngokusekelwe ekukhetheni kwayo okuhle kwe-spectral kanye nokukhetha kwe-Angle, i-oscillator. i-oscillates kubude obuthile noma ibhendi ukuze kuzuzwe indima yokukhetha imodi yobude, njengoba kuboniswe kuMfanekiso 7(d).
Ngasikhathi sinye, izindlela ezimbalwa zokukhetha imodi yobude zingahlanganiswa ngokuya ngezidingo zokuthuthukisa ukunemba kokukhetha imodi yelongitudinal, unciphise ngokwengeziwe ububanzi bomugqa, noma ukhuphule ukuqina kokuncintisana kwemodi ngokwethula uguquko lwefrikhwensi engaqondile nezinye izindlela, nokwandisa ubude begagasi lokuphumayo. i-laser ngenkathi isebenza ngobubanzi obuncane bomugqa, okunzima ukuyenzaI-semiconductor laserfuthii-fiber lasers.
(4) I-laser ye-brillouin
I-laser ye-Brillouin isuselwe kumphumela ovuselelwe we-Brillouin scattering (SBS) ukuze kutholwe umsindo ophansi, ubuchwepheshe bokuphuma obuncane bobubanzi bomugqa, umgomo wayo usebenzisa i-photon nokusebenzisana kwenkundla ye-acoustic yangaphakathi ukuze kukhiqizwe imvamisa ethile ye-Stokes photons, futhi ikhuliswa ngokuqhubekayo ngaphakathi thola i-bandwidth.
Umfanekiso 8 ubonisa umdwebo weleveli wokuguqulwa kwe-SBS kanye nesakhiwo esiyisisekelo se-laser ye-Brillouin.
Ngenxa yemvamisa ephansi yokudlidliza yenkundla ye-acoustic, i-Brillouin frequency shift of the material ivamise ukuba ngu-0.1-2 cm-1 kuphela, ngakho-ke nge-laser engu-1064 nm njengokukhanya kwepompo, ubude begagasi be-Stokes obukhiqizwayo buvame ukuba ngu-1064.01 nm kuphela, kodwa lokhu futhi kusho ukuthi ukusebenza kahle kwayo kokuguqulwa kwe-quantum kuphezulu kakhulu (kufika ku-99.99% ngokombono). Ngaphezu kwalokho, ngenxa yokuthi iBrillouin izuza ububanzi bomugqa wemidiya ngokuvamile iwuhlelo lwe-MHZ-ghz kuphela (i-Brillouin izuza ububanzi bomugqa wemidiya ethile eqinile icishe ibe ngu-10 MHz), incane kakhulu kunobubanzi bokuzuza kwento esebenzayo ye-laser. ye-oda ye-100 GHz, ngakho-ke, i-Stokes ejabulile ku-Brillouin laser ingabonisa into esobala yokuncipha kwe-spectrum ngemva kokukhulisa okuningi emgodini, futhi ububanzi bayo bomugqa okukhiphayo buyimiyalo eminingana yobukhulu obuncane kunobubanzi bomugqa wephampu. Njengamanje, i-laser ye-Brillouin isiphenduke isizinda socwaningo emkhakheni wezithombe, futhi kube nemibiko eminingi ku-Hz ne-sub-Hz oda yokuphuma komugqa omncane kakhulu.
Eminyakeni yamuva, amadivaysi e-Brillouin anesakhiwo se-waveguide avele emkhakheni weizithombe ze-microwave, futhi zithuthuka ngokushesha ekuqondeni kwe-miniaturization, ukuhlanganiswa okuphezulu nokuxazulula okuphezulu. Ngaphezu kwalokho, i-laser ye-Brillouin egijima emkhathini esekelwe ezintweni zekristalu entsha njengedayimane nayo ingene embonweni wabantu eminyakeni emibili edlule, impumelelo yayo emisha emandleni esakhiwo se-waveguide kanye ne-cascade SBS bottleneck, amandla e-laser ye-Brillouin. kuya ku-10 W ubukhulu, ibeka isisekelo sokwandisa ukusetshenziswa kwayo.
Ukuhlangana okujwayelekile
Ngokucutshungulwa okuqhubekayo kolwazi olusezingeni eliphezulu, ama-laser obubanzi obuncane abe yithuluzi elibalulekile ocwaningweni lwesayensi ngokusebenza kwawo okuhle kakhulu, njenge-laser interferometer LIGO yokuthola amagagasi adonsela phansi, esebenzisa imvamisa eyodwa yobubanzi obuyingcingo.lasernge-wavelength engu-1064 nm njengomthombo wembewu, futhi ububanzi bomugqa wokukhanya kwembewu bungaphakathi kuka-5 kHz. Ngaphezu kwalokho, ama-lasers anobubanzi obuncane anoshutheka we-wavelength futhi akukho gxuma kwemodi futhi akhombisa amandla amakhulu okusebenza, ikakhulukazi ekuxhumaneni okuhambisanayo, okungahlangabezana ngokuphelele nezidingo ze-wavelength division multiplexing (WDM) noma i-frequency division multiplexing (FDM) ye-wavelength (noma imvamisa). ) ukusebenziseka, futhi kulindeleke ukuthi kube yinsizakalo yesizukulwane esilandelayo sobuchwepheshe bezokuxhumana ngomakhalekhukhwini.
Esikhathini esizayo, ukusungulwa kwezinto ezintsha ze-laser kanye nobuchwepheshe bokucubungula kuzothuthukisa ukucindezelwa kobubanzi bomugqa we-laser, ukuthuthukiswa kokuzinza kwamaza, ukunwetshwa kobubanzi be-wavelength kanye nokwenza ngcono kwamandla, kuvula indlela yokuhlola komuntu umhlaba ongaziwa.
Isikhathi sokuthumela: Nov-29-2023