Pụrụ iche ultrafast laser akụkụ nke mbụ

Pụrụ icheultrafast laserakụkụ nke mbụ

Njirimara pụrụ iche nke ultrafastlasers
Oge ultra-short pulse nke laser ultrafast na-enye usoro ndị a ihe pụrụ iche nke na-amata ọdịiche dị na lasers ogologo oge ma ọ bụ na-aga n'ihu (CW). Iji mepụta obere mkpirisi usu dị otú ahụ, a chọrọ nnukwu bandwit dị iche iche. The pulse udi na Central wavelength na-ekpebi opekempe bandwit chọrọ n'ịwa pulses nke otu oge. Na-emekarị, a na-akọwa mmekọrịta a n'usoro ngwaahịa oge-bandwidth (TBP), nke sitere na ụkpụrụ ejighị n'aka. A na-enye TBP nke pulse Gaussian site na usoro a: TBPGaussian = ΔτΔν≈0.441
Δτ bụ oge pulse na Δv bụ bandwit ugboro ugboro. N'ezie, nha nha na-egosi na enwere mmekọrịta dị iche n'etiti bandwit dị iche iche na ogologo oge pulse, nke pụtara na ka oge nke pulse na-ebelata, bandwit achọrọ iji mepụta ụbụrụ ahụ na-abawanye. Ọgụgụ 1 na-egosi obere bandwit achọrọ iji kwado ọtụtụ oge pulse dị iche iche.

Ọgụgụ 1: bandwit spectral kacha nta achọrọ iji kwadoọkpụkpụ lasernke 10ps (green), 500fs (acha anụnụ anụnụ), na 50fs (red)

Ihe ịma aka teknụzụ nke ultrafast lasers
A ghaghị ijikwa bandwit dị obosara, ike kacha elu, na oge pulse dị mkpụmkpụ nke laser ultrafast nke ọma na sistemụ gị. Ọtụtụ mgbe, otu n'ime ihe ngwọta kachasị mfe maka nsogbu ndị a bụ mmepụta ihe dị iche iche nke lasers. Ọ bụrụ na ị na-ejibu laser ogologo pulse ma ọ bụ na-efegharị efegharị na-aga n'ihu n'oge gara aga, ngwaahịa ngwa anya gị dị ugbu a nwere ike ọ gaghị enwe ike ịtụgharị ma ọ bụ bufee bandwidth zuru oke nke ultrafast pulses.

Ọnụ ụzọ mmebi laser
Ultrafast optics nwekwara nnukwu dị iche na nke siri ike ịnyagharịa ọnụ ụzọ mmebi laser (LDT) ma e jiri ya tụnyere isi mmalite laser ndị ọzọ. Mgbe a na-enye opticsnanosecond pulsed lasers, ụkpụrụ LDT na-abụkarị n'usoro nke 5-10 J/cm2. Maka ultrafast optics, ụkpụrụ nke ịdị ukwuu a bụ ihe a na-anụbeghị, ebe ụkpụrụ LDT nwere ike ịdị n'usoro nke <1 J/cm2, na-adịkarị nso 0.3 J/cm2. Ọdịiche dị ịrịba ama nke njupụta LDT n'okpuru ogologo oge pulse dị iche iche bụ nsonaazụ nke usoro mmebi laser dabere na oge usu. Maka laser nanosecond ma ọ bụ karịalasers pulsed, isi usoro nke na-akpata mmebi bụ ikpo ọkụ ọkụ. Ihe mkpuchi na ihe substrate nkengwa anya ngwaọrụbanye foton ndị merenụ wee kpoo ha ọkụ. Nke a nwere ike iduga ngbanwe nke kristal lattice nke ihe. Mgbasa ọkụ, mgbawa, mgbaze na eriri lattice bụ usoro mmebi ọkụ na-emekarị nke ndị aisi mmalite laser.

Otú ọ dị, maka ultrafast lasers, oge pulse n'onwe ya na-adị ngwa ngwa karịa oge okpomọkụ na-ebufe site na laser gaa na lattice ihe, ya mere mmetụta okpomọkụ abụghị isi ihe kpatara mmebi nke laser. Kama nke ahụ, ike kachasị elu nke laser ultrafast na-agbanwe usoro mmebi ahụ n'ime usoro ndị na-adịghị adị dị ka absorption multi-photon na ionization. Nke a bụ ya mere na ọ gaghị ekwe omume nanị ibelata ọkwa LDT nke nanosecond pulse na nke ultrafast pulse, n'ihi na usoro anụ ahụ nke mmebi dị iche. Ya mere, n'okpuru otu ọnọdụ ojiji (dịka ọmụmaatụ, ogologo ogologo, ogologo oge, na ọnụego nkwughachi), ngwaọrụ anya nwere akara LDT zuru oke ga-abụ ngwaọrụ anya kacha mma maka ngwa gị akọwapụtara. Optics a nwalere n'okpuru ọnọdụ dị iche iche abụghị ihe nnọchianya nke arụmọrụ nke otu ngwa anya na sistemụ.

Ọgụgụ 1: Usoro nke mmebi nke laser nwere ogologo oge pulse dị iche iche