Iyo yakakosha musimboti we single-modhi fiber lasers

Nheyo yekutanga yesingle-modhi fiber lasers

Chizvarwa chelaser chinoda kusangana nemamiriro matatu ekutanga: inversion yehuwandu, yakakodzera resonant mhango, uye kusvika iyolaserchikumbaridzo (kuwana kwechiedza mugomba resonant inofanira kuva yakakura kudarika kurasikirwa). Iyo yekushanda mashandiro e-single-modhi fiber lasers yakanyatso kuenderana neaya akakosha mamisimboti emuviri uye inowana optimization yekuita kuburikidza neyakasiyana chimiro chefiber waveguides.

Yakasimudzwa radiation uye huwandu hwevanhu inversion ndiyo hwaro hwepanyama hwekugadzirwa kwema lasers. Kana simba rechiedza rinobudiswa nepombi sosi (kazhinji semiconductor laser diode) rinoiswa mufiber yekuwana yakasanganiswa neasingawanzo pasi pasi (seYtterbium Yb³⁺, erbium Er³⁺), iyo isingawanzo ion yepasi inotora simba uye shanduko kubva pasi pasi kuenda kunzvimbo yekunakidzwa. Kana iyo nhamba yeioni munharaunda inofadza inodarika iyo muvhu revhu, huwandu hwevanhu inversion state inoumbwa. Panguva ino, chiitiko fotoni chinokonzeresa kumutswa kwemwaranzi yeiyo inonakidza-nyika ion, ichigadzira nyowani mafotoni eiyo yakafanana frequency, nhanho uye gwara sechiitiko foton, nekudaro kuwana optical amplification.

Chinhu chakakosha che single-modefiber lasersinorara mudhayamita yavo yakanyatsonaka yepakati (kazhinji 8-14μm). Zvinoenderana newave optics theory, iyo yakanaka musimboti inogona chete kubvumira imwe electromagnetic field mode (kureva, yakakosha modhi LP₀₁ kana HE₁₁ modhi) kuti ifambiswe zvakadzikama, kureva, iyo imwechete modhi. Izvi zvinobvisa dambudziko rekupararira kweintermodal riripo mumultimode fibers, ndiko kuti, pulse wideening phenomenon inokonzerwa nekupararira kwemhando dzakasiyana-siyana kumhanya kwakasiyana. Kubva pamaonero ehunhu hwekutapurirana, mutsauko wenzira yechiedza chinopararira pamwe neaxial kutungamira mune imwe-modhi optical fibers idiki zvakanyanya, izvo zvinoita kuti danda rekubuda rive nekubatana kwakakwana kwenzvimbo uye Gaussian simba rekugovera, uye danda remhando yeM² rinogona kusvika 1 (M² = 1 kune yakanaka Gaussian danda).

Fiber lasers vamiriri vakatanhamara vechizvarwa chechitatulaser tekinoroji, iyo inoshandisa isingawanzo pasi element-doped glass fibers senzira yekuwana. Mumakore gumi apfuura, single-mode fiber lasers yakatora chikamu chakakosha mumusika wepasi rose welaser, nekuda kweyakasarudzika mabhenefiti. Kuenzaniswa nemultimode fiber lasers kana yechinyakare solid-state laser, single-mode fiber lasers inogona kuburitsa yakanakira Gaussian danda ine danda remhando padhuze ne1, zvinoreva kuti danda rinogona kusvika painoretical yakaderera divergence Angle uye shoma yakatarisana nzvimbo. Iyi ficha inoita kuti isadzorereke muminda yekugadziriswa uye kuyerwa kunoda kurongeka kwepamusoro uye kuderera kwekupisa kwekupisa.