Tekinoroji ye laser yekunzwa fiber ye optical Chikamu Chechipiri
2.2 Kutsvaira kwehurefu hwewavelength imwe chetesosi yelaser
Kuzadzikiswa kwekushandiswa kwe laser single wavelength sweep kunonyanya kukosha kudzora hunhu hwechishandiso chiri mulasercavity (kazhinji centre wavelength ye operating bandwidth), kuitira kuti pave nekudzora uye kusarudzwa kwe oscillating longitudinal mode mu cavity, kuitira kuti pave nechinangwa chekugadzirisa output wavelength. Zvichibva panheyo iyi, kare kuma1980, kuwanikwa kwe tunable fiber lasers kwainyanya kuwanikwa nekutsiva reflective end face ye laser ne reflective diffraction grating, uye kusarudza laser cavity mode nekutenderera nemaoko nekugadzirisa diffraction grating. Muna 2011, Zhu et al. vakashandisa tunable filters kuti vawane single-wavelength tunable laser output ne narrow linewidth. Muna 2016, Rayleigh linewidth compression mechanism yakashandiswa kune dual-wavelength compression, kureva kuti, stress yakashandiswa kuFBG kuti pave ne dual-wavelength laser tuning, uye output laser linewidth yakatariswa panguva imwe chete, ichiwana wavelength tuning range ye3 nm. Dual-wavelength stable output ine line width yeinenge 700 Hz. Muna 2017, Zhu et al. Vakashandisa graphene ne micro-nano fiber Bragg grating kugadzira firita inogadziriswa ne all-optical, uye pamwe chete neBrillouin laser narrowing technology, vakashandisa photothermal effect yegraphene iri pedyo ne1550 nm kuti vawane laser linewidth yakaderera se750 Hz uye photocontrolled fast and accurate scanning ye700 MHz/ms mu wavelength range ye3.67 nm. Sezvakaratidzwa muMufananidzo 5. Nzira yekudzora wavelength iri pamusoro apa inonyanya kuita kuti laser mode isarudze nekuchinja zvakananga kana zvisina kunanga passband center wavelength yemudziyo uri mu laser cavity.
Mufananidzo 5 (a) Kuedzwa kwehurefu hwemafungu hunodzorwa nemazisolaser yefiber inogadziriswauye hurongwa hwekuyera;
(b) Kubuda kwesimba pamagetsi e2 nekuwedzerwa kwepombi inodzora
2.3 Chitubu chechiedza chelaser chena
Kugadzirwa kwechiedza chichena kwakasangana nematanho akasiyana-siyana akadai serambi re halogen tungsten, rambi re deuterium,laser ye semiconductoruye supercontinuum light source. Kunyanya, supercontinuum light source, pasi pekukwezvwa kwefemtosecond kana picosecond pulses ine simba re super transient, inogadzira nonlinear effects yemirairo yakasiyana-siyana mu waveguide, uye spectrum inokura zvakanyanya, iyo inogona kufukidza bhendi kubva kuchiedza chinoonekwa kusvika pedyo ne infrared, uye ine kubatana kwakasimba. Pamusoro pezvo, nekugadzirisa kupararira uye nonlinearity ye special fiber, spectrum yayo inogona kutowedzerwa kusvika pakati pe infrared band. Rudzi urwu rwe laser source rwakashandiswa zvakanyanya muminda yakawanda, senge optical coherence tomography, gas detection, biological imaging nezvimwewo. Nekuda kwekuganhurirwa kwechiedza uye nonlinear medium, early supercontinuum spectrum yakanyanya kugadzirwa ne solid-state laser pumping optical glass kuti igadzire supercontinuum spectrum mu visible range. Kubva ipapo, optical fiber zvishoma nezvishoma yakava medium yakanaka yekugadzira wideband supercontinuum nekuda kwe hombe nonlinear coefficient yayo uye small transmission mode field. Migumisiro mikuru isiri yemutsara inosanganisira kusanganiswa kwemafungu mana, kusagadzikana kwemodulation, self-phase modulation, cross-phase modulation, soliton splitting, Raman scattering, soliton self-frequency shift, nezvimwewo, uye huwandu hwemhedzisiro yega yega hwakasiyanawo zvichienderana nehupamhi hwepulse ye excitation pulse uye kupararira kwefiber. Kazhinji, ikozvino supercontinuum light source inonyanya kunangana nekuvandudza simba re laser uye kuwedzera spectral range, uye teererai kudzorwa kwayo kwekubatana.
3 Pfupiso
Pepa iri rinopfupikisa uye rinoongorora manyuko elaser anoshandiswa kutsigira tekinoroji yekuona fiber, kusanganisira narrow linewidth laser, single frequency tunable laser uye broadband white laser. Zvinodiwa zvekushandiswa uye mamiriro ekugadzirwa kwemalaser aya mumunda wekuona fiber zvinounzwa zvakadzama. Nekuongorora zvinodiwa zvavo uye mamiriro ekugadzirwa, zvinogumiswa kuti sosi yelaser yakakodzera yekuona fiber inogona kuwana ultra-narrow uye ultra-stable laser output pane chero band uye chero nguva. Naizvozvo, tinotanga ne narrow line width laser, tunable narrow line width laser uye white light laser ine wide gain bandwidth, uye tinotsvaga nzira inoshanda yekuwana sosi yelaser yakakodzera yekuona fiber nekuongorora kukura kwavo.
Nguva yekutumira: Mbudzi-21-2023