Nhasi, tichaunza laser "monochromatic" kune yakanyanya - laser yakamanikana ine upamhi hwemutsara. Kubuda kwayo kunozadza mipata iri muminda yakawanda yekushandiswa kwe laser, uye mumakore achangopfuura yave ichishandiswa zvakanyanya mukuona mafungu egiravhiti, liDAR, distributed sensing, high-speed coherent optical communication nedzimwe nzvimbo, inova "basa" risingagone kupedzwa nekuvandudza simba re laser chete.
Chii chinonzi laser ine upamhi hwakatetepa?
Izwi rekuti "mutsetse wakafara" rinoreva upamhi hwemutsara wespectral welaser munzvimbo yema frequency, iyo inowanzo verengerwa maererano nehafu-peak yakazara yespectrum (FWHM). Upamhi hwemutsara hunonyanya kukanganiswa nemwaranzi inongoerekana yaitika yemaatomu kana ma ions anofara, ruzha rwechikamu, kuzununguka kwemuchina we resonator, temperature jitter nezvimwe zvinhu zvekunze. Kana kukosha kwehupamhi hwemutsara kukaderera, kuchena kwespectrum kwakakwira, ndiko kuti, monochromaticity yelaser iri nani. MaLaser ane hunhu hwakadaro anowanzova neruzha rushoma rwechikamu kana frequency uye ruzha rushoma rwekusimba. Panguva imwe chete, kana kukosha kwehupamhi hwemutsara welaser kudiki, kubatana kwakasimba kunoenderana, uko kunoratidzwa sehurefu hwakareba kwazvo hwekubatana.
Kuzadzikiswa uye kushandiswa kwelaser yakamanikana yemutsara
Yakaganhurirwa nehupamhi hwekuwana hwechinhu chinoshanda chelaser, hazvigoneke kuona zvakananga kubuda kwelaser ine hurefu hwemutsara nekushandisa oscillator yechinyakare pachayo. Kuti ugone kuona mashandiro elaser ine hurefu hwemutsara, zvinowanzo dikanwa kushandisa mafirita, grating nezvimwe zvishandiso kuganhurira kana kusarudza longitudinal modulus mu gain spectrum, kuwedzera mutsauko wekuwana pakati pe longitudinal modes, kuitira kuti pave ne oscillation shoma kana imwe chete ye longitudinal mode mulaser resonator. Mukuita uku, zvinowanzo dikanwa kudzora simba reruzha pa laser output, uye kuderedza kuwedzera kwe spectral lines kunokonzerwa ne vibration uye tembiricha shanduko yekunze; Panguva imwe chete, inogona zvakare kubatanidzwa nekuongorora phase kana frequency noise spectral density kuti unzwisise kwakabva ruzha uye kugadzirisa dhizaini yelaser, kuitira kuti uwane stable output yelaser ine hurefu hwemutsara.
Ngatitarisei kushanda kwemutsara wakamanikana wemhando dzakasiyana dzema lasers.
Malaser eSemiconductor ane zvakanakira zvehukuru hudiki, kushanda zvakanaka, kugara kwenguva refu uye mabhenefiti ehupfumi.
Iyo Fabry-Perot (FP) optical resonator inoshandiswa mune zvechinyakarelaser dze semiconductorkazhinji inotenderera mu multi-longitudinal mode, uye upamhi hwemutsetse wekubuda hwakafara, saka zvakakosha kuwedzera mhinduro ye optical kuti uwane kubuda kwehupamhi hwemutsetse wakamanikana.
Distributed feedback (DFB) neDistributed Bragg reflection (DBR) imhando mbiri dzeinternal optical feedback semiconductor lasers. Nekuda kwe small grating pitch uye good wavelength selectivity, zviri nyore kuwana stable single-frequency narrow linewidth output. Musiyano mukuru pakati pezvimiro zviviri izvi inzvimbo ye grating: chimiro cheDFB chinowanzo govera chimiro che periodic cheBragg grating mu resonator yese, uye resonator yeDBR inowanzo umbwa ne reflection grating structure uye gain region yakabatanidzwa mu end surface. Pamusoro pezvo, DFB lasers dzinoshandisa embedded gratings dzine low refractive index contrast uye low reflectivity. DBR lasers dzinoshandisa surface gratings dzine high refractive index contrast uye high reflectivity. Zvimiro zvese zvine free spectral range yakakura uye zvinogona kuita wavelength tuning pasina mode jump mu range ye nanometers shoma, uko DBR laser ine width tuning range yakafara kupfuuraLaser yeDFBPamusoro pezvo, tekinoroji yemhinduro yekunze kwemukati mechiedza, iyo inoshandisa zvinhu zvekunze zvechiedza kupindura chiedza chinobuda che semiconductor laser chip uye kusarudza frequency, inogonawo kuita kuti semiconductor laser ishande zvakanaka.
(2) Malaser efaibha
Malaser efiber ane simba guru rekushandura pombi, mhando yakanaka yemwaranzi uye kushanda zvakanaka kwekubatanidza, izvo zviri nyaya dzinotsvakurudzwa zvakanyanya mumunda welaser. Mukati merimwe nguva yeruzivo, malaser efiber ane hukama hwakanaka nemasisitimu ekutaurirana e optical fiber aripo pamusika. Laser yefiber ine mabhenefiti ehupamhi hwemutsara wakamanikana, ruzha rwakaderera uye kubatana kwakanaka yave imwe yenzira dzakakosha dzekugadzirwa kwayo.
Kushanda kwe single longitudinal mode ndiko musimboti we fiber laser kuti ibudise mutsetse wakamanikana, kazhinji zvichienderana nechimiro che resonator, single frequency fiber laser inogona kukamurwa kuva DFB type, DBR type uye ring type. Pakati pavo, musimboti wekushanda kwe DFB ne DBR single-frequency fiber lasers wakafanana newa DFB ne DBR semiconductor lasers.
Sezvakaratidzwa muMufananidzo 1, DFB fiber laser inofanira kunyora Bragg grating yakapararira mufiber. Nekuti urefu hwemafungu ekushanda kweoscillator hunokanganiswa nenguva yefiber, longitudinal mode inogona kusarudzwa kuburikidza ne distributed feedback yegrating. Laser resonator yeDBR laser inowanzo umbwa ne pair ye fiber Bragg gratings, uye single longitudinal mode inonyanya kusarudzwa ne narrow band uye low reflectivity fiber Bragg gratings. Zvisinei, nekuda kwe long resonator yayo, complex structure uye kushaya effective frequency discrimination mechanism, ring-shaped cavity inowanzo chinja mode, uye zvakaoma kushanda stably mu constant longitudinal mode kwenguva yakareba.
Mufananidzo 1, Zvimiro zviviri zvakajairika zve frequency imwe chetemalaser efaibha
Nguva yekutumira: Mbudzi-27-2023