Taa, anyị ga-ewebata laser "monochromatic" ruo n'ókè - obere laser linewidth. Mpụta ya na-ejupụta oghere dị n'ọtụtụ ebe eji laser eme ihe, a na-ejikwa ya nke ọma n'afọ ndị na-adịbeghị anya na nchọpụta ebili mmiri ike ndọda, liDAR, nchọpụta kesara, nkwukọrịta anya dị elu na-agba ọsọ na mpaghara ndị ọzọ, nke bụ "ọrụ" nke a na-apụghị imecha naanị site na imeziwanye ike laser.
Kedu ihe bụ laser dị warara nke nwere obosara ahịrị?
Okwu ahụ bụ "obosara ahịrị" na-ezo aka na obosara ahịrị spectral nke laser na mpaghara ugboro, nke a na-agbakọkarị n'ihe gbasara ọkara oke obosara zuru oke nke spectrum (FWHM). Radiation nke atọm ma ọ bụ ion ndị a na-akpali akpali, mkpọtụ nke usoro, mkpọtụ igwe nke resonator, mkpọtụ okpomọkụ na ihe ndị ọzọ dị n'èzí na-emetụta obosara ahịrị ahụ. Ka uru nke obosara ahịrị dị obere, otú ahụ ka ịdị ọcha nke spectrum dị elu, ya bụ, ka monochromaticity nke laser ka mma. Laser ndị nwere àgwà ndị dị otú ahụ na-enwekarị obere mkpọtụ nke usoro ma ọ bụ ugboro ugboro na obere mkpọtụ ike dịtụ. N'otu oge ahụ, ka uru obosara ahịrị nke laser dị obere, otú ahụ ka njikọ kwekọrọ si sie ike, nke a na-egosipụta dị ka ogologo njikọ dị ogologo.
Nghọta na itinye laser dị warara n'ọrụ
N'ihi oke nha nhata nke ihe na-arụ ọrụ nke laser ahụ, ọ fọrọ nke nta ka ọ ghara ikwe omume ịchọpụta mmepụta nke laser obosara dị warara site na ịdabere na oscillator ọdịnala n'onwe ya. Iji mezuo ọrụ nke laser obosara dị warara, ọ na-adịkarị mkpa iji nzacha, grating na ngwaọrụ ndị ọzọ iji belata ma ọ bụ họrọ modulus ogologo na spectrum gain, mee ka ọdịiche uru dị n'etiti ụdị longitarian dịkwuo elu, ka e wee nwee ole na ole ma ọ bụ ọbụna otu oscillation ụdị longitudinal na resonator laser. N'ime usoro a, ọ dị mkpa ijikwa mmetụta nke mkpọtụ na mmepụta laser, ma belata mgbasa nke ahịrị spectral nke mgbanwe mkpọtụ na okpomọkụ nke gburugburu ebe obibi mpụga kpatara; N'otu oge ahụ, enwere ike ijikọ ya na nyocha nke njupụta spectral nke usoro ma ọ bụ ugboro ugboro iji ghọta isi iyi nke mkpọtụ ma melite nhazi nke laser ahụ, ka e wee nweta mmepụta kwụsiri ike nke laser obosara dị warara.
Ka anyị leba anya n'otú e si arụ ọrụ dị warara nke ọtụtụ ụdị laser dị iche iche.
Laser semiconductor nwere uru dị ka obere nha, arụmọrụ dị elu, ogologo ndụ na uru akụ na ụba.
Ihe na-eme ka ihe na-eme ka ihe na-eme ka ihe na-eme ka ihe na-eme ka ihe na-eme ka ihe dị n'ime Fabry-Perot (FP) rụọ ọrụ.laser semiconductorỌ na-agbagharịkarị n'ụdị ogologo dị iche iche, obosara ahịrị mmepụta dịkwa obosara, yabụ ọ dị mkpa ịbawanye nzaghachi anya iji nweta mmepụta nke obosara ahịrị dị warara.
Nzaghachi Kesara (DFB) na Distributed Bragg reflection (DBR) bụ laser abụọ a na-ahụkarị n'ime ihe ngosi ọkụ eletrik. N'ihi obere oghere grating na nhọrọ ogologo ebili mmiri dị mma, ọ dị mfe inweta mmepụta obosara ahịrị dị warara nke otu ugboro kwụsiri ike. Isi ihe dị iche n'etiti ihe owuwu abụọ ahụ bụ ọnọdụ nke grating: ihe owuwu DFB na-ekesakarị usoro oge nke Bragg grating n'ofe resonator ahụ, resonator nke DBR na-abụkarị nke nhazi grating reflection na mpaghara uru ejikọtara na elu njedebe. Na mgbakwunye, laser DFB na-eji gratings agbakwunyere nwere obere ọdịiche index refractive na obere reflective. Laser DBR na-eji gratings elu nwere nnukwu refractive index contrast na nnukwu reflective. Ihe owuwu abụọ a nwere nnukwu spectral spectral ma nwee ike ịrụ nhazi ebili mmiri na-enweghị mwụda mode na oke nanometers ole na ole, ebe laser DBR nwere oke nhazi sara mbara karịaLaser DFBTinyere nke ahụ, teknụzụ nzaghachi anya oghere dị n'èzí, nke na-eji ihe anya mpụga iji meghachi omume na ìhè na-apụ apụ nke chip laser semiconductor ma họrọ ugboro ole, nwekwara ike ime ka ọrụ laser semiconductor dị warara rụọ ọrụ.
(2) Eriri laser
Igwe laser eriri nwere arụmọrụ mgbanwe mgbapụta dị elu, ezigbo mma nke ìhè na arụmọrụ njikọ dị elu, nke bụ isiokwu nyocha na-ekpo ọkụ n'ọhịa laser. N'ihe gbasara oge ozi, eriri laser nwere ezigbo ndakọrịta na sistemụ nkwukọrịta eriri anya dị ugbu a n'ahịa. Igwe laser eriri otu ugboro nwere uru nke obosara ahịrị dị warara, obere mkpọtụ na ịdị n'otu aghọọla otu n'ime ntụziaka dị mkpa maka mmepe ya.
Ọrụ otu ụdị ogologo oge bụ isi ihe dị na laser eriri iji nweta mmepụta dị warara-obosara ahịrị, dịka usoro nke resonator nke laser eriri ugboro ugboro si dị, enwere ike kewaa ya n'ụdị DFB, ụdị DBR na ụdị mgbanaka. N'ime ha, ụkpụrụ ọrụ nke DFB na DBR fiber laser otu ugboro yiri nke DFB na DBR semiconductor lasers.
Dịka egosiri na Foto 1, DFB fiber laser ga-ede Bragg grating nke e kesara n'ime eriri ahụ. Ebe ọ bụ na ogologo eriri ahụ na-emetụta ogologo oge ọrụ nke oscillator, enwere ike ịhọrọ ụdị longitudinal site na nzaghachi kesara nke grating ahụ. A na-ejikarị eriri Bragg gratings emepụta resonator laser nke DBR laser, a na-ahọrọkwa ụdị longitudinal otu site na eriri dị warara na obere reflectivity fiber Bragg gratings. Agbanyeghị, n'ihi resonator ya dị ogologo, nhazi dị mgbagwoju anya na enweghị usoro ịkpa ókè ugboro ugboro dị irè, oghere dị ka mgbaaka na-adịkarị mfe ịnyagharị mode, ọ na-esikwa ike ịrụ ọrụ nke ọma na ụdị longitudinal mgbe niile ruo ogologo oge.
Foto nke 1, Nhazi abụọ a na-ahụkarị nke otu ugboroeriri lasers
Oge ozi: Nọvemba-27-2023