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 ye-longitudinal esekelwe ku-in-cavity ye-FP standard, okungukuthi, i-spectrum yokudlulisa ububanzi bomugqa omncane wezinga isetshenziselwa ukwandisa ukulahlekelwa kwezinye izindlela ze-longitudinal, ukuze ezinye izindlela ze-longitudinal zihlungwe kunqubo yokuncintisana kwemodi ngenxa yemodethi yazo encane yokudlulisa i-longididi eyodwa, ukuze kuzuzwe indlela yokudlulisa i-longitudi eyodwa. 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. Isimiso sokusebenza siwukwenza ugongolo lusakaze endaweni eyodwa ku-resonator, luqede ngokuphumelelayo ukusatshalaliswa kwendawo okungalingani kwenani lezinhlayiya ezihlehlisiwe endaweni evamile yokuma kwamagagasi, futhi ngaleyo ndlela kugwenywe ithonya lomphumela wokushiswa kwembobo yendawo ukuze kuzuzwe ukuphuma kwemodi eyodwa ye-longitudinal. Isimiso sokukhetha imodi ye-Bragg grating (VBG) ngobuningi siyefana nesemiconductor kanye ne-fibre emincane yobubanzi bomugqa we-lases okukhulunywe ngayo ngaphambili, okungukuthi, ngokusebenzisa i-VBG njengento yokuhlunga, ngokusekelwe ekukhetheni kwayo okuhle kwe-spectral kanye nokukhetha kwe-Angle, i-oscillator izungeza ubude begagasi obuthile noma ibhendi ukuze kuzuzwe indima yokukhetha ubude, njengoba kuboniswe kubude bobude (7).
Ngasikhathi sinye, izindlela ezimbalwa zokukhetha imodi ye-longitudinal zingahlanganiswa ngokuya ngezidingo zokuthuthukisa ukunemba kokukhetha imodi ye-longitudinal, unciphise ngokwengeziwe ububanzi bomugqa, noma ukhuphule umfutho wemodi yokuncintisana ngokwethula uguquko lwefrikhwensi engaqondile nezinye izindlela, futhi kwandiswe ubude begagasi be-laser ngenkathi isebenza kumugqa womugqa omncane, okunzima ukuwenza.I-semiconductor laserfuthii-fiber lasers.
(4) I-laser ye-brillouin
I-laser ye-Brillouin isekelwe kumphumela ovuselelwe we-Brillouin scattering (SBS) ukuze kutholwe umsindo ophansi, ubuchwepheshe bokuphuma obuncane bobubanzi bomugqa, umgomo wayo nge-photon kanye nokusebenzisana kwenkundla ye-acoustic yangaphakathi ukuze kukhiqizwe ukushintsha okuthile kwama-Stokes photons, futhi ithuthukiswa ngokuqhubekayo ngaphakathi komkhawulokudonsa wokuzuza.
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 ngelaser engu-1064 nm njengokukhanya kwephampu, ubude beza beza beStokes obukhiqizwayo buvamise ukuba ngu-1064.01 nm kuphela, kodwa lokhu futhi kusho ukuthi ukuguqulwa kwe-quantum yayo ukusebenza kahle kokungu-9 kuya ku-9 kuya phezulu kakhulu. Ngaphezu kwalokho, ngenxa yokuthi iBrillouin ithola ububanzi bomugqa we-medium imvamisa iwuhlelo lwe-MHZ-ghz kuphela (i-Brillouin izuza ububanzi bomugqa wemidiya ethile eqinile icishe ibe ngu-10 MHz), ingaphansi kakhulu kokuzuza komugqa wobubanzi bento esebenzayo ye-laser ye-oda le-100 GHz, ngakho-ke, ama-Stokes ajabulile ku-Brillouin spectrum ngemuva kokubonisa i-laser ecacile, futhi ububanzi bomugqa wokukhiphayo bungama-oda amaningana obukhulu 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 entsha emandleni esakhiwo se-waveguide kanye ne-cascade SBS bottleneck, amandla e-laser ye-Brillouin kuya ku-10 W magnitude, 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-laser anobubanzi obuncane anoshutheka we-wavelength futhi akukho gxuma kwemodi futhi akhombisa amandla amakhulu ohlelo lokusebenza, ikakhulukazi ekuxhumaneni okuhambisanayo, okungahlangabezana ngokuphelele nezidingo ze-wavelength division multiplexing (WDM) noma i-frequency division multiplexing (FDM) yokulinganisa ubude (noma imvamisa), futhi kulindeleke ukuthi ibe insiza eyinhloko yesizukulwane esilandelayo sobuchwepheshe bokuxhumana beselula.
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