Lero, tidzakhala ndi laser "monochromatic" mopitirira malire - yopapatiza ya laser linewidth.Kutuluka kwake kumadzaza mipata m'magawo ambiri ogwiritsira ntchito laser, ndipo m'zaka zaposachedwa wakhala akugwiritsidwa ntchito kwambiri pozindikira mafunde amphamvu yokoka, liDAR, kugawikana, kulumikizana kwamphamvu kwambiri komanso madera ena, omwe ndi "ntchito" yomwe siingatheke. kumalizidwa kokha ndi kuwongolera mphamvu ya laser.
Kodi laser yopapatiza yamtundu wanji?
Mawu akuti "m'lifupi wa mzere" amatanthauza kukula kwa mzere wa spectral wa laser mu frequency domain, yomwe nthawi zambiri imawerengedwa motengera theka la nsonga yathunthu ya sipekitiramu (FWHM).The linewidth makamaka amakhudzidwa mowiriza cheza cha maatomu okondwa kapena ayoni, gawo phokoso, makina kugwedera wa resonator, kutentha jitter ndi zina kunja zinthu.Zing'onozing'ono zamtengo wapatali wa mzerewu, zimakweza chiyero cha sipekitiramu, ndiko kuti, bwino ndi monochromaticity ya laser.Ma laser okhala ndi mikhalidwe yotere nthawi zambiri amakhala ndi gawo locheperako kapena phokoso lafupipafupi komanso phokoso laling'ono kwambiri.Panthawi imodzimodziyo, kucheperako kwa mzere wamtali wamtundu wa laser, kumalimbitsa mgwirizano wofanana, womwe umawonetsedwa ngati kutalika kwautali kwambiri.
Kuzindikira ndi kugwiritsa ntchito yopapatiza linewidth laser
Mochepa ndi kupindula kwachilengedwe kwazinthu zogwirira ntchito za laser, ndizosatheka kuzindikira mwachindunji kutulutsa kwa laser yopapatiza podalira oscillator wamba.Kuti muzindikire magwiridwe antchito a laser yopapatiza, nthawi zambiri pamafunika kugwiritsa ntchito zosefera, grating ndi zida zina kuti muchepetse kapena kusankha modulus yotalikirapo mumtundu wopeza, kukulitsa kusiyana kwaukonde pakati pamitundu yayitali, kuti pakhale oscillation ochepa kapena amodzi okha aatali mu laser resonator.Pochita izi, nthawi zambiri zimakhala zofunikira kuwongolera mphamvu ya phokoso pakupanga kwa laser, ndikuchepetsa kufalikira kwa mizere yowonekera chifukwa cha kugwedezeka ndi kusintha kwa kutentha kwa chilengedwe chakunja;Nthawi yomweyo, imathanso kuphatikizidwa ndi kuwunika kwa gawo kapena pafupipafupi phokoso lowoneka bwino kuti mumvetsetse komwe kumachokera phokoso ndikuwongolera kapangidwe ka laser, kuti mukwaniritse kutulutsa kokhazikika kwa laser yopapatiza.
Tiyeni tiwone kukwaniritsidwa kwa ntchito yopapatiza yamitundu yosiyanasiyana ya lasers.
Ma laser a semiconductor ali ndi maubwino a kukula kophatikizika, kuchita bwino kwambiri, moyo wautali komanso phindu lazachuma.
Fabry-Perot (FP) optical resonator yogwiritsidwa ntchito mwachikhalidwelaser semiconductorzambiri oscillates mumalowedwe Mipikisano longitudinal, ndi linanena bungwe mzere m'lifupi ndi lonse, choncho m'pofunika kuonjezera ndemanga kuwala kupeza linanena bungwe la yopapatiza mzere m'lifupi.
Distributed feedback (DFB) ndi Distributed Bragg reflection (DBR) ndi ma lasers awiri amkati opangira mayankho a semiconductor.Chifukwa cha kachulukidwe kakang'ono ka grating ndi kusankha kwabwino kwa mafunde, ndikosavuta kukwaniritsa kukhazikika kwapang'onopang'ono kocheperako.Kusiyana kwakukulu pakati pazigawo ziwirizi ndi malo a grating: mawonekedwe a DFB nthawi zambiri amagawira mawonekedwe a nthawi zonse a Bragg grating mu resonator, ndipo resonator ya DBR nthawi zambiri imakhala ndi mawonekedwe a grating ndi gawo lopindula lophatikizidwa mu resonator. mapeto pamwamba.Kuphatikiza apo, ma laser a DFB amagwiritsa ntchito ma grating ophatikizidwa okhala ndi index yotsika ya refractive index komanso mawonekedwe otsika.Ma laser a DBR amagwiritsa ntchito ma gratings apamtunda okhala ndi mawonekedwe apamwamba a refractive index komanso mawonekedwe apamwamba.Mapangidwe onsewa ali ndi mawonekedwe akulu aulere ndipo amatha kuwongolera mafunde popanda kudumphadumpha pama nanometer angapo, pomwe DBR laser ili ndi mawonekedwe okulirapo kuposaDFB laser.Kuphatikiza apo, ukadaulo wakunja wapang'onopang'ono wopangira mayankho, womwe umagwiritsa ntchito zinthu zakunja zakunja kuti uyankhe kuwala kotuluka kwa semiconductor laser chip ndikusankha pafupipafupi, imatha kuzindikiranso kutalika kwa mzere wa semiconductor laser.
(2) Fiber lasers
Ma fiber lasers ali ndi mphamvu yosinthira pampu, mtundu wabwino wa mtengo komanso kulumikizana kwabwino kwambiri, yomwe ndi mitu yotentha yofufuza m'munda wa laser.Pankhani yanthawi yazidziwitso, ma fiber lasers amalumikizana bwino ndi makina amakono olumikizirana opangira ma fiber pamsika.The single-frequency fiber laser yokhala ndi ubwino wamzere wopapatiza, phokoso lochepa komanso kulumikizana kwabwino kwakhala imodzi mwamagawo ofunikira pakukula kwake.
Single longitudinal mode ntchito pachimake cha CHIKWANGWANI laser kukwaniritsa yopapatiza mzere-linanena bungwe m'lifupi, kawirikawiri malinga ndi dongosolo la resonator wa single pafupipafupi CHIKWANGWANI laser akhoza kugawidwa mu mtundu DFB, DBR mtundu ndi mphete mtundu.Pakati pawo, mfundo yogwira ntchito ya DFB ndi DBR single-frequency fiber lasers ndi yofanana ndi ya DFB ndi DBR semiconductor lasers.
Monga momwe chithunzi 1, DFB CHIKWANGWANI laser ndi kulemba anagawira Bragg grating mu CHIKWANGWANI.Chifukwa chakuti kutalika kwa mawonekedwe a oscillator kumakhudzidwa ndi nthawi ya fiber, mawonekedwe a nthawi yayitali amatha kusankhidwa kupyolera mu ndemanga zogawidwa za grating.Laser resonator ya DBR laser nthawi zambiri imapangidwa ndi ulusi wa Bragg gratings, ndipo njira imodzi yotalikirapo imasankhidwa makamaka ndi gulu lopapatiza komanso magalasi otsika owoneka bwino a Bragg.Komabe, chifukwa cha resonator yake yayitali, kapangidwe kake kovutirapo komanso kusowa kwa njira yotsatsira pafupipafupi, pabowo wokhala ngati mphete nthawi zambiri amadumphadumpha, ndipo zimakhala zovuta kugwira ntchito mokhazikika mokhazikika kwa nthawi yayitali.
Chithunzi 1, Mitundu iwiri yofananira yamafupipafupi amodzifiber lasers
Nthawi yotumiza: Nov-27-2023