Laser sosi tekinoroji yeOptical fiber inonzwa Chikamu Chechipiri
2.2 Kutsvaira kwewavelength imwelaser source
Kuzadzikiswa kwelaser single wavelength kutsvaira ndiko kudzora zvimiro zvechishandiso mulasercavity (kazhinji iyo yepakati wavelength yeiyo inoshanda bandwidth), kuitira kuti uwane kutonga uye kusarudzwa kweiyo oscillating longitudinal modhi mumhango, kuitira kuti uwane chinangwa chekugadzirisa iyo inobuda wavelength. Zvichienderana nemusimboti uyu, kutanga kuma1980s, kuzadzikiswa kwetunable fiber lasers kwainyanya kuwanikwa nekutsiva inotaridzika yekupedzisira kumeso kwelaser neinotaridza diffraction grating, uye kusarudza iyo laser cavity modhi nekutenderera nemaoko uye kugadzirisa diffraction grating. Muna 2011, Zhu et al. yakashandisa tunable mafirita kuwana imwe-wavelength tunable laser inobuda ine nhete mutsara. Muna 2016, Rayleigh linewidth compression mechanism yakashandiswa kune mbiri-wavelength compression, kureva kuti, kushushikana kwakaiswa kuFBG kuti iwane mbiri-wavelength laser tuning, uye yakabuda laser linewidth yakaongororwa panguva imwe chete, ichiwana wavelength tuning renji ye3. nm. Dual-wavelength yakagadzikana inobuda ine mutsara wakafara unosvika 700 Hz. Muna 2017, Zhu et al. yakashandisa graphene uye micro-nano fiber Bragg grating kugadzira iyo yose-optical tunable sefa, uye yakasanganiswa neBrillouin laser narrowing tekinoroji, yakashandisa iyo photothermal mhedzisiro yegraphene padyo ne1550 nm kuwana laser linewidth yakaderera se750 Hz uye foto inodzorwa nekukurumidza uye kunyatsoongorora kwe700 MHz/ms muwavelength renji ye3.67 nm. Sezvinoratidzwa muFigure 5. Iyo iri pamusoro apa yavelength yekudzora nzira inonyanya kuona iyo laser mode sarudzo nekuchinja zvakananga kana zvisina kunanga passband centre wavelength yechishandiso mune laser cavity.
Fig. 5 (a) Kuedza kuseta kweiyo optical-controllable wavelength-tunable fiber laseruye hurongwa hwekuyera;
(b) Mucherechedzo wekubuditsa pakubuda 2 pamwe nekusimudzirwa kwepombi inodzora
2.3 White laser light source
Iko kuvandudzwa kwechiedza chichena sosi kwakasangana nematanho akasiyana senge halogen tungsten mwenje, deuterium rambi,semiconductor laseruye supercontinuum chiedza sosi. Kunyanya, iyo supercontinuum mwenje sosi, pasi pekunakidzwa kwefemtosecond kana picosecond pulses ine simba rinopfuura simba, inoburitsa mhedzisiro yemirairo yakasiyana-siyana muwaveguide, uye iyo spectrum yakawedzera zvakanyanya, iyo inogona kuvhara bhendi kubva kuchiedza chinooneka kusvika pedyo infrared, uye ine kuwirirana kwakasimba. Uye zvakare, nekugadzirisa kupararira uye kusaenzana kweiyo yakakosha fiber, iyo spectrum inogona kutowedzerwa kune yepakati-infrared band. Iri rudzi rwelaser sosi yakashandiswa zvakanyanya mundima dzakawanda, senge optical coherence tomography, kuona gasi, biological imaging uye zvichingodaro. Nekuda kwekudzikisira kwemwenje sosi uye isina mitsetse yepakati, yekutanga supercontinuum spectrum yainyanya kugadzirwa ne solid-state laser kupomba girazi remaziso kuti ribudise iyo supercontinuum spectrum mune inooneka renji. Kubva ipapo, optical fiber yave zvishoma nezvishoma yave yakanakisa svikiro yekugadzira wideband supercontinuum nekuda kweiyo yakakura isina mutsara coefficient uye diki transmission mode ndima. Mhedzisiro mikuru isina mutsara inosanganisira mana-wave kusanganisa, kusagadzikana kwemodulation, self-phase modulation, cross-phase modulation, soliton kupatsanura, Raman kuparadzira, soliton self-frequency shift, nezvimwewo, uye chikamu chega chega chiitiko chakasiyanawo maererano ne pulse hupamhi hwemhepo yekukurudzira uye kupararira kwefiber. Kazhinji, ikozvino supercontinuum mwenje sosi inonyanya kunatsiridza iyo laser simba uye kuwedzera iyo spectral renji, uye teerera kune yayo kubatana kutonga.
3 Pfupiso
Iri bepa rinopfupikisa uye rinoongorora ma laser masosi anoshandiswa kutsigira fiber inonzwa tekinoroji, kusanganisira yakatetepa linewidth laser, single frequency tunable laser uye Broadband chena laser. Izvo zvinodiwa zvekushandisa uye mamiriro ekusimudzira eaya lasers mumunda wefiber sensing anounzwa zvakadzama. Nekuongorora zvavanoda uye chimiro chekusimudzira, zvinogumiswa kuti yakanakira laser sosi yefiber sensing inogona kuwana yakanyanya-yakamanikana uye yekupedzisira-yakagadzika laser kubuda chero bhendi uye chero nguva. Naizvozvo, isu tinotanga neyakatetepa mutsara wakafara laser, tunable yakatetepa mutsara wakafara laser uye chena mwenje laser ine yakafara kuwana bandwidth, uye tsvaga nzira inoshanda yekuziva yakanakira laser sosi yefiber sensing nekuongorora kukura kwavo.
Nguva yekutumira: Nov-21-2023