Nhasi, isu tichaunza "monochromatic" laser kune yakanyanyisa - nhete linewidth laser.Kubuda kwayo kunozadza mapeji muminda yakawanda yekushandiswa kwelaser, uye mumakore achangopfuura yakashandiswa zvakanyanya mukuona mafungu ekukwevera, liDAR, kugovaniswa kwekunzwa, kumhanyisa-kumhanya kwakabatana kutaurirana kwemaziso uye mamwe minda, inova "mission" isingagone kuitwa. inopedzwa chete nekuvandudza laser simba.
Chii chinonzi nhete linewidth laser?
Izwi rekuti "mutsara wakafara" rinoreva hupamhi hwemutsara welaser mune frequency domain, iyo inowanzo kuverengerwa maererano nehafu-yepamusoro yakazara upamhi hweiyo spectrum (FWHM).Iyo linewidth inonyanya kukanganiswa nemwaranzi inongoerekana yaitika yemaatomu anonakidzwa kana maion, ruzha rwechikamu, mechanical vibration ye resonator, tembiricha jitter uye zvimwe zvinhu zvekunze.Iyo diki kukosha kwehupamhi hwemutsara, iyo yakakwirira kuchena kweiyo spectrum, ndiko kuti, zviri nani iyo monochromaticity yelaser.MaLaser ane hunhu hwakadai kazhinji ane chikamu chidiki-diki kana frequency ruzha uye kushoma chaiko kwehukama ruzha.Panguva imwecheteyo, iyo idiki iyo mutsara wehupamhi kukosha kwelaser, iyo inosimba inowirirana inobatana, iyo inoratidzwa seyakanyanya kureba yakabatana kureba.
Kuziva uye kushandiswa kweyakamanikana linewidth laser
Yakaganhurirwa neiyo yemukati kuwana mutsara weiyo inoshanda chinhu chelaser, zvinenge zvisingaite kuti uone zvakananga kuburitswa kweiyo nhete mutsara welaser nekuvimba neiyo yechinyakare oscillator pachayo.Kuti uone kushanda kweyakatetepa linewidth laser, zvinowanzodikanwa kushandisa mafirita, grating uye zvimwe zvishandiso kudzikamisa kana kusarudza iyo longitudinal modulus mune yekuwana spectrum, kuwedzera mambure ekuwana mutsauko pakati peiyo longitudinal modes, kuitira kuti pave ne vashoma kana kunyange imwe chete longitudinal modhi oscillation mune laser resonator.Mukuita uku, kazhinji zvinodikanwa kudzora pesvedzero yeruzha pane yekubuda kwelaser, uye kuderedza kuwedzera kwemitsara ye spectral inokonzerwa nekudengenyeka uye shanduko yekushisa kwekunze kwezvakatipoteredza;Panguva imwecheteyo, inogona zvakare kusanganiswa nekuongororwa kwechikamu kana frequency ruzha spectral density kuti unzwisise kwakabva ruzha uye kukwidziridza dhizaini yelaser, kuitira kuti uwane yakagadzikana kubuda kweyakatetepa linewidth laser.
Ngatitarisei kuzadzikiswa kweakatetepa linewidth mashandiro emhando dzakasiyana siyana dze lasers.
Semiconductor lasers ane zvakanakira compact saizi, kushanda kwakanyanya, hupenyu hurefu uye hupfumi hunobatsira.
Iyo Fabry-Perot (FP) optical resonator inoshandiswa muchinyakaresemiconductor laserskazhinji oscillates mu-multi-longitudinal mode, uye upamhi hwemutsara wekubuda hwakakura, saka zvakakosha kuwedzera mhinduro yemaziso kuti uwane kubuda kwehupamhi hwemutsara wakamanikana.
Distributed feedback (DFB) uye Distributed Bragg reflection (DBR) ndiwo maviri akajairika emukati optical mhinduro semiconductor lasers.Nekuda kweiyo diki grating pitch uye yakanaka wavelength kusarudza, zviri nyore kuwana yakagadzikana imwe-frequency yakatetepa linewidth kubuda.Musiyano mukuru pakati pezvimiro zviviri inzvimbo yekugezesa: iyo DFB chimiro chinowanzo kugovera iyo periodic chimiro cheBragg grating mukati me resonator, uye resonator yeDBR inowanzo umbwa yeratidziro yegirati chimiro uye nharaunda yekuwana yakabatanidzwa mukati. nzvimbo yekupedzisira.Uye zvakare, maDFB lasers anoshandisa akamisikidzwa gratings ane yakaderera refractive index musiyano uye yakaderera reflectivity.DBR lasers anoshandisa pamusoro gratings ane yakakwira refractive index musiyano uye yakakwirira kuratidza.Maumbirwo ese ari maviri ane hombe yemahara yekuona uye anogona kuita wavelength tuning pasina modhi kusvetuka mukati meiyo nanometer mashoma, uko DBR laser ine yakafara tuning siyana kupfuura iyo.DFB laser.Uye zvakare, iyo yekunze cavity optical mhinduro tekinoroji, iyo inoshandisa ekunze optical zvinhu kuti ipindure iyo inobuda mwenje we semiconductor laser chip uye kusarudza iyo frequency, inogona zvakare kuona yakatetepa mutsara mashandiro eiyo semiconductor laser.
(2) Fiber lasers
Fiber lasers ine yakakwira pombi shanduko inoshanda, yakanaka danda mhando uye yakakwirira coupling kunyatsoita, ari iwo anopisa ekutsvagira misoro mumunda welaser.Mumamiriro ezvinhu ezera reruzivo, mafiber lasers ane kuenderana neazvino optical fiber kutaurirana masisitimu pamusika.Iyo single-frequency fiber laser ine mabhenefiti eyakatetepa mutsara upamhi, yakaderera ruzha uye yakanaka kubatana yave imwe yeakakosha nhungamiro yekukura kwayo.
Single longitudinal mode operation ndiyo musimboti wefiber laser kuti uwane yakamanikana mutsara-wakafara kubuda, kazhinji zvinoenderana nechimiro cheiyo resonator ye single frequency fiber laser inogona kukamurwa kuita DFB mhando, DBR mhando uye mhete mhando.Pakati pavo, musimboti wekushanda weDFB uye DBR single-frequency fiber lasers yakafanana neiyo yeDFB uye DBR semiconductor lasers.
Sezvinoratidzwa muFigure 1, DFB fiber laser ndeyekunyora yakagoverwa Bragg grating mufayibha.Nokuti kushanda kwewavelength ye oscillator inobatwa nefiber nguva, iyo longitudinal mode inogona kusarudzwa kuburikidza nemhinduro yakagoverwa ye grating.Iyo laser resonator yeDBR laser inowanzo umbwa nembiri ye fiber Bragg gratings, uye iyo imwechete longitudinal modhi inonyanya kusarudzwa neyakamanikana bhendi uye yakaderera reflectivity fiber Bragg gratings.Nekudaro, nekuda kweiyo resonator refu, chimiro chakaomarara uye kushaikwa kweanoshanda frequency rusaruro mashini, denderedzwa-yakaita gomo rinowanzoita kusvetuka-svetuka, uye zvakaoma kushanda zvakatsiga mukugara kwenguva yakareba modhi.
Mufananidzo 1, Maviri akajairwa mutsara zvimiro zveimwe frequencyfiber lasers
Nguva yekutumira: Nov-27-2023