Kajeno, re tla hlahisa "laser" ea "monochromatic" ho feteletseng - laser e moqotetsane oa linewidth. Ho hlaha ha eona ho tlatsa likheo likarolong tse ngata tsa ts'ebeliso ea laser, 'me lilemong tsa morao tjena e' nile ea sebelisoa haholo ho lemoha leqhubu la khoheli, liDAR, sensing e arolelanoang, puisano ea optical e nang le lebelo le phahameng le likarolo tse ling, e leng "thōmo" e ke keng ea etsoa. phethoa feela ka ho ntlafatsa matla a laser.
Laser e patisaneng ka bophara ba mola ke eng?
Poleloana "bophara ba mohala" e bolela bophara ba mohala oa spectral oa laser sebakeng sa maqhubu, seo hangata se lekantsoeng ho latela halofo ea tlhōrō e feletseng ea bophara ba spectrum (FWHM). The linewidth haholo-holo angoa ke mahlaseli a itlelang feela ea liathomo thabo kapa li-ion, lerata la mohato, mochine o sisinyehang oa resonator, jitter mocheso le lintho tse ling tse ka ntle. Ntho e nyenyane ea boleng ba bophara ba mohala, e phahamisa bohloeki ba marang-rang, ke hore, ho molemo ho feta monochromaticity ea laser. Li-Laser tse nang le litšobotsi tse joalo hangata li na le mohato o fokolang haholo kapa lerata la khafetsa le lerata le lenyenyane haholo. Ka nako e ts'oanang, boleng bo fokolang ba bophara ba mohala oa laser, bo matla ba momahano o lumellanang, o bonahatsoang e le bolelele bo bolelele ba momahano.
Ho elelloa le ho sebelisoa ha laser linewidth e moqotetsane
Ho fokotsoa ke phaello ea tlhaho ea bophara ba ntho e sebetsang ea laser, ho batla ho sa khonehe ho lemoha ka ho toba tlhahiso ea laser e moqotetsane ea bophara ka ho itšetleha ka oscillator ea setso ka boeona. Bakeng sa ho hlokomela ts'ebetso ea laser e moqotetsane, hangata hoa hlokahala ho sebelisa li-filters, grating le lisebelisoa tse ling ho fokotsa kapa ho khetha modulus ea longitudinal molemong oa phaello, ho eketsa phapang ea letlooa lipakeng tsa mekhoa ea longitudinal, e le hore ho be le oscillation e fokolang kapa e le 'ngoe feela ea longitudinal ho resonator ea laser. Ts'ebetsong ena, hangata hoa hlokahala ho laola tšusumetso ea lerata ho tlhahiso ea laser, le ho fokotsa ho pharalla ha mela ea spectral e bakoang ke ho sisinyeha le liphetoho tsa mocheso oa tikoloho ea kantle; Ka nako e ts'oanang, e ka boela ea kopanngoa le tlhahlobo ea sekhahla sa sekhahla sa lerata kapa maqhubu a lerata ho utloisisa mohloli oa lerata le ho ntlafatsa moralo oa laser, e le ho finyella tlhahiso e tsitsitseng ea laser e moqotetsane.
Ha re shebeng ts'ebetso ea ts'ebetso ea mola o mosesaane oa mekhahlelo e mengata e fapaneng ea lasers.
Li-lasers tsa semiconductor li na le melemo ea boholo bo kopaneng, ts'ebetso e phahameng, bophelo bo bolelele le melemo ea moruo.
Fabry-Perot (FP) optical resonator e sebelisoang moetlonglisebelisoa tsa laser tsa semiconductorka kakaretso oscillates ka mokgwa wa multi-longitudinal, 'me sephetho mola bophara bophara batlang e le bophara, kahoo ho ke ke ho hlokahala hore ho eketsa maikutlo a optical ho fumana tlhahiso ea moqotetsane bophara ba mola.
Distributed feedback (DFB) le Distributed Bragg reflection (DBR) ke li-lasers tse peli tse tloaelehileng tsa ka hare tsa semiconductor. Ka lebaka la sekontiri se senyenyane sa grating le khetho e ntle ea wavelength, ho bonolo ho fihlella tlhahiso e tsitsitseng ea maqhubu a moqotetsane a le mong. Phapang e kholo lipakeng tsa meaho ena e 'meli ke boemo ba grating: sebopeho sa DFB hangata se aba sebopeho sa nako le nako sa Bragg grating ho pholletsa le resonator,' me resonator ea DBR hangata e entsoe ka sebopeho sa grating se bonahatsang le sebaka sa phaello se kopantsoeng le bokaholimo ba pheletso. Ntle le moo, li-laser tsa DFB li sebelisa li-grating tse kentsoeng tse nang le phapang e tlase ea index ea refractive le ponahalo e tlase. Li-laser tsa DBR li sebelisa li-grating tsa bokaholimo tse nang le phapang e phahameng ea li-refractive index le ponahalo e phahameng. Mehaho ka bobeli e na le sebaka se seholo sa mahala sa spectral mme e khona ho etsa tokiso ea wavelength ntle le mokhoa oa ho tlola lipakeng tsa nanometer tse 'maloa, moo laser ea DBR e nang le mefuta e mengata ea tokiso ho fetaDFB laser. Ho phaella moo, thekenoloji ea "external cavity optical feedback" , e sebelisang lisebelisoa tsa ka ntle tsa optical ho fana ka maikutlo a leseli le hlahang la semiconductor laser chip le ho khetha maqhubu, e ka boela ea hlokomela ts'ebetso e fokolang ea mohala oa semiconductor laser.
(2) Fiber lasers
Li-laser tsa fiber li na le ts'ebetso e phahameng ea phetolo ea pompo, boleng bo botle ba maballo le ts'ebetso e phahameng ea ho kopanya, e leng lihlooho tsa lipatlisiso tse chesang lebaleng la laser. Boemong ba mehla ea tlhahisoleseling, li-laser tsa fiber li lumellana hantle le litsamaiso tsa hajoale tsa puisano tsa optical fiber 'marakeng. Laser ea fiber e le 'ngoe e nang le melemo ea bophara ba mela e moqotetsane, lerata le tlaase le momahano e ntle e fetohile e' ngoe ea litsela tsa bohlokoa tsa tsoelo-pele ea eona.
Single longitudinal mode opereishene ke motheo oa fiber laser ho finyella e moqotetsane mola-bophara tlhahiso, hangata ho ea ka sebopeho sa resonator ea single frequency fiber laser e ka aroloa ka DFB mofuta, DBR mofuta le lesale mofuta. Har'a tsona, molao-motheo o sebetsang oa DFB le DBR single-frequency fiber lasers o tšoana le oa DFB le DBR semiconductor lasers.
Joalo ka ha ho bonts'itsoe ho Setšoantšo sa 1, DFB fiber laser ke ho ngola Bragg grating ka har'a fiber. Hobane leqhubu la ho sebetsa la oscillator le angoa ke nako ea fiber, mokhoa oa longitudinal o ka khethoa ka maikutlo a ajoang a grating. Laser resonator ea DBR laser hangata e thehoa ke li-fiber Bragg gratings, 'me mokhoa o le mong oa longitudinal o khethoa haholo ke sehlopha se moqotetsane le li-fiber tse fokolang tsa Bragg. Leha ho le joalo, ka lebaka la resonator ea eona e telele, sebopeho se rarahaneng le khaello ea mokhoa o atlehang oa khethollo ea makhetlo, lekhalo le nang le sebopeho sa selikalikoe le na le tšekamelo ea ho tlōla-tlōla, 'me ho thata ho sebetsa ka mokhoa o tsitsitseng nako e telele ka nako e telele.
Setšoantšo sa 1, Mehaho e 'meli e tloaelehileng ea mela ea maqhubu a le mongli-laser tsa fiber
Nako ea poso: Nov-27-2023