Kedu ihe bụ laser linewidth dị warara?

Gịnị bụ alesa linewid dị warara?

Lesa linewidth dị warara, Okwu “obosara ahịrị” na-ezo aka na obosara ahịrị spectral nkelasern'ime ngalaba ugboro, nke a na-agụkarị n'usoro nke ọkara-peak zuru oke nke ụdịdị dị iche iche (FWHM). A na-emetụta obosara linen nke ukwuu site na radieshon na-apụtaghị ìhè nke atọm ma ọ bụ ion na-akpali akpali, mkpọtụ oge, ịma jijiji nke igwe resonator, ihe na-ekpo ọkụ na ihe ndị ọzọ dị na mpụga. Obere uru nke obosara ahịrị, nke dị elu nke ịdị ọcha nke ụdịdị dị iche iche, ya bụ, ka mma monochromaticity nke laser. Lasers nwere àgwà ndị dị otú ahụ na-enwekarị obere oge ma ọ bụ ụda ugboro ole na obere mkpọtụ ike ike. N'otu oge ahụ, ntakịrị uru obosara linear nke laser, na-esiwanye ike na nkwekọ kwekọrọ, nke a na-egosipụta dị ka ogologo nkwekọ dị ogologo.

Nghọta na ntinye nke laser linewidth dị warara

Oke site n'inwe uru dị n'obosara nke ihe na-arụ ọrụ nke laser, ọ fọrọ nke nta ka ọ bụrụ ihe na-agaghị ekwe omume ịghọta nsonaazụ nke laser linewidth ozugbo site na ịdabere na oscillator ọdịnala n'onwe ya. Iji ghọta ọrụ nke laser linewidth dị warara, ọ na-adịkarị mkpa iji nzacha, grating na ngwaọrụ ndị ọzọ na-amachi ma ọ bụ họrọ modul ogologo na uru dị iche iche, na-abawanye uru net dị iche n'etiti ụdị ogologo ogologo, nke mere na enwere ole na ole ma ọ bụ ọbụna naanị otu oscillation mode ogologo na resonator laser. N'ime usoro a, ọ na-adịkarị mkpa ijikwa mmetụta nke mkpọtụ na mmepụta laser, ma belata mgbasawanye nke ahịrị spectral nke na-eme ka mkpọtụ na mgbanwe okpomọkụ nke gburugburu ebe dịpụrụ adịpụ; N'otu oge ahụ, ọ nwekwara ike jikọta ya na nyocha nke usoro ma ọ bụ ugboro ugboro mkpọtụ spectral density iji ghọta isi iyi nke mkpọtụ na ebuli imewe nke laser, nke mere na iji nweta kwụsiri ike mmepụta nke warara linewidth laser.

Ka anyị leba anya n'ịghọta ọrụ dị warara linewidth nke ọtụtụ ụdị lasers dị iche iche.

(1)Semiconductor laser

Laser semiconductor nwere uru nke nha kọmpat, arụmọrụ dị elu, ogologo ndụ na uru akụ na ụba.

The Fabry-Perot (FP) resonator ngwa anya ejiri na omenalasemiconductor lasersn'ozuzu oscillates na multi-longitudinal mode, na mmepụta ahịrị obosara bụ dịtụ obosara, n'ihi ya, ọ dị mkpa dịkwuo ngwa anya nzaghachi iji nweta mmepụta nke warara ahịrị obosara.

Nzaghachi ekesara (DFB Laser) na nkesa Bragg reflection (DBR) bụ ihe abụọ na-ahụkarị nleba anya n'ime ime semiconductor lasers. N'ihi obere grating pitch na ezigbo wavelength selectivity, ọ dị mfe iji nweta mmepụta linewid dị warara kwụsiri ike otu ugboro. Isi ihe dị iche n'etiti ihe owuwu abụọ ahụ bụ ọnọdụ nke grating: ihe owuwu DFB Laser na-ekesa usoro oge nke Bragg grating n'oge resonator, na resonator nke DBR na-abụkarị nke usoro grating na-egosipụta na mpaghara uru agbakwunyere na njedebe njedebe. Na mgbakwunye, lasers DFB na-eji grating agbakwunyere nwere ọdịiche ntụgharị ntụgharị dị ala yana ngosipụta dị ala. Laser DBR na-eji grating elu elu nwere ọdịiche ntugharị refractive dị elu yana ngosipụta dị elu. Ihe owuwu abụọ a nwere nnukwu ihe nlegharị anya n'efu ma nwee ike ịrụ nrụgharị ogologo ogologo na-enweghị ịwụli elu n'ogo nke nanometer ole na ole, ebe laser DBR nwere oke nlegharị anya karịaDFB laser. Na mgbakwunye, teknụzụ nzaghachi anya oghere dị n'èzí, nke na-eji ihe ndị na-ahụ anya mpụga na-azaghachi ọkụ na-apụ apụ nke mgbawa laser semiconductor wee họrọ ugboro ole, nwekwara ike ghọta ọrụ eriri nke semiconductor laser.

(2) Fiber lasers

Fiber lasers nwere elu mgbapụta ngbanwe arụmọrụ, ezigbo ọkụ ọkụ na arụmọrụ dị elu, nke bụ isiokwu nyocha na-ekpo ọkụ na mpaghara laser. Na onodu nke ozi afọ, fiber lasers nwere ezi ndakọrịta na ugbu a ngwa anya fiber nkwurịta okwu usoro na ahịa. The otu-ugboro fiber laser na uru nke warara ahịrị obosara, ala mkpọtụ na ezi coherence aghọwo otu n'ime mkpa ntụziaka nke ya mmepe.

Single longitudinal mode ọrụ bụ isi nke eriri laser nweta warara akara-obosara mmepụta, na-emekarị dị ka Ọdịdị nke resonator nke otu ugboro eriri laser nwere ike kewara n'ime DFB ụdị, DBR ụdị na mgbanaka ụdị. N'ime ha, ụkpụrụ ọrụ nke DFB Laser na DBR otu ugboro fiber lasers yiri nke DFB na DBR semiconductor lasers.

(3)Laser steeti siri ike

N'afọ 1960, laser ruby ​​mbụ nke ụwa bụ laser steeti siri ike, nke e ji ike mmepụta dị elu na mkpuchi ogologo ogologo oge mara. Ọdịdị oghere pụrụ iche nke laser steeti siri ike na-eme ka ọ dịkwuo mfe n'ichepụta mmepụta linewidth dị warara. Ka ọ dị ugbu a, ụzọ ndị bụ isi etinyere gụnyere usoro oghere dị mkpụmkpụ, usoro mgbanaka otu ụzọ, usoro ọkọlọtọ intracavity, usoro oghere nke torsion pendulum, usoro grating olu Bragg na usoro ịgba mkpụrụ.