Umgaqo osisiseko we-single-mode fiber lasers

Umgaqo osisiseko weiileyiza zefayibha zemowudi enye

Ukuveliswa kwelaser kufuna ukuhlangabezana neemeko ezintathu ezisisiseko: ukuguquka kwabantu, umgodi ofanelekileyo we-resonant, kunye nokufikelelailezaumngcele (ukwanda kokukhanya kwindawo evakalayo kufuneka kube ngaphezulu kokulahleka). Indlela yokusebenza ye-single-mode fiber lasers isekelwe ngqo kule migaqo isisiseko yomzimba kwaye ifezekisa ukwenziwa ngcono kokusebenza ngesakhiwo esikhethekileyo se-fiber waveguides.

Imitha evuselelweyo kunye nokuguqulwa kwenani labantu zizinto ezisisiseko sokwenziwa kwee-laser. Xa amandla okukhanya akhutshwa ngumthombo wepompo (ngesiqhelo i-semiconductor laser diode) efakwa kwi-gain fiber exutywe nee-ions zomhlaba ezingaqhelekanga (ezifana neYtterbium Yb³⁺, erbium Er³⁺), ii-ions zomhlaba ezingaqhelekanga zifunxa amandla kwaye zitshintshe ukusuka kwimeko yomhlaba ukuya kwimeko evuselelekileyo. Xa inani lee-ions kwimeko evuselelekileyo lidlula elo kwimeko yomhlaba, kwakheka imeko yokuguqulwa kwenani labantu. Kule ndawo, i-photon yesiganeko iya kubangela imitha evuselelekileyo ye-ion yesiganeko esivuselelekileyo, ivelise ii-photons ezintsha ze-frequency, isigaba kunye necala elifanayo ne-photon yesiganeko, ngaloo ndlela ifezekisa ukwandiswa kwe-optical.

Uphawu oluphambili lwemowudi enyeiileyiza zefayibhaikwi-diameter yayo ecolekileyo kakhulu ye-core (ngesiqhelo yi-8-14μm). Ngokwethiyori ye-wave optics, i-core enjalo ecolekileyo inokuvumela kuphela imo yentsimi ye-electromagnetic enye (oko kukuthi, imo yesiseko ye-LP₀₁ okanye imo ye-HE₁₁) ukuba idluliselwe ngokuzinzileyo, oko kukuthi, imo enye. Oku kususa ingxaki yokusasazwa kwe-intermodal ekhoyo kwi-multimode fibers, oko kukuthi, i-pulse broadening phenomenon ebangelwa kukusasazwa kweendlela ezahlukeneyo ngesantya esahlukileyo. Ngokwembono yeempawu zothumelo, umahluko wendlela yokukhanya okusasazekayo kwicala le-axial kwi-single-mode optical fibers mncinci kakhulu, nto leyo eyenza ukuba i-output beam ibe nokuhambelana okupheleleyo kwendawo kunye nokusasazwa kwamandla e-Gaussian, kwaye i-beam quality factor M² inokusondela kwi-1 (M²=1 ye-Gaussian beam efanelekileyo).

Iifayibha ze-laser zimela kakuhle isizukulwana sesithathuiteknoloji yelaser, ezisebenzisa iifayibha zeglasi ezinqabileyo zomhlaba njengesixhobo sokufumana inzuzo. Kwiminyaka elishumi edlulileyo, iilaser zefayibha zemowudi enye zithathe isabelo esibaluleke ngakumbi kwimarike yelaser yehlabathi, ngenxa yeenzuzo zazo zokusebenza ezikhethekileyo. Xa kuthelekiswa neelaser zefayibha zemowudi ezininzi okanye ilaser yendabuko yesimo esiqinileyo, iilaser zefayibha zemowudi enye zinokuvelisa umqadi weGaussian ofanelekileyo onomgangatho womqadi osondele kwi-1, oko kuthetha ukuba umqadi ungafikelela kwi-Angle encinci yokwahlukana kunye nendawo encinci egxile kuyo. Olu phawu lwenza ukuba lungathathelwa indawo kwiindawo zokucubungula kunye nokulinganisa ezifuna ukuchaneka okuphezulu kunye nefuthe eliphantsi lobushushu.