Mkpọlite ​​nke harmonics nke abụọ n'ọtụtụ ụdị dị iche iche

Mkpọlite ​​nke harmonics nke abụọ n'ọtụtụ ụdị dị iche iche

Kemgbe nchọpụta nke mmetụta anya nke abụọ na-abụghị nke ahịrị na 1960, akpaliela mmasị nke ndị nchọpụta, ruo ugbu a, dabere na mmetụta harmonic nke abụọ, na ugboro ugboro, emepụtala site na oke ultraviolet ruo na eriri infrared dị anya nkelasers, kwalitere mmepe nke laser nke ukwuu,ngwa anyaNhazi ozi, onyonyo obere ihe osise dị elu na mpaghara ndị ọzọ. Dịka usoro na-abụghị ahịrị si kwuo.ngwa anyana ozizi polarization, mmetụta anya nke na-abụghị nke kwụ ọtọ nwere njikọ chiri anya na kristal symmetry, na ihe na-abụghị nke kwụ ọtọ abụghị naanị efu na mgbasa ozi symmetric inversion na-abụghị nke etiti. Dịka mmetụta nke abụọ kachasị mkpa na-abụghị nke kwụ ọtọ, harmonics nke abụọ na-egbochi mmepụta ha nke ukwuu na ojiji dị irè na eriri quartz n'ihi ụdị amorphous na symmetry nke ntụgharị etiti. Ugbu a, usoro polarization (optical polarization, thermal polarization, electric field polarization) nwere ike imebi symmetry nke ntụgharị etiti ihe nke eriri optic n'ụzọ artificial, ma melite nke ọma nonlinearity nke eriri optic nke abụọ. Agbanyeghị, usoro a chọrọ teknụzụ nkwadebe siri ike ma na-achọsi ike, ọ nwekwara ike izute naanị ọnọdụ dakọtara quasi-phase na ebili mmiri dị iche iche. Mgbaaka resonant eriri optic dabere na ụdị mgbidi echo na-egbochi mkpali spectrum sara mbara nke harmonics nke abụọ. Site na imebi symmetry nke nhazi elu nke eriri ahụ, a na-eme ka harmonics nke abụọ elu dị na eriri nhazi pụrụ iche dịkwuo mma ruo n'ókè ụfọdụ, mana ka na-adabere na pulse mgbapụta femtosecond nwere ike dị elu nke ukwuu. Ya mere, mmepụta nke mmetụta anya nke abụọ na-abụghị ahịrị n'usoro na nhazi eriri niile na mmezi nke arụmọrụ ntụgharị, karịsịa mmepụta nke harmonics nke abụọ dị iche iche na mgbapụta anya dị ala, na-aga n'ihu, bụ nsogbu ndị bụ isi nke kwesịrị idozi n'ọhịa nke eriri anya na ngwaọrụ na-abụghị ahịrị, ma nwee mkpa sayensị dị mkpa na uru ngwa sara mbara.

Otu ndị nyocha na China atụpụtala atụmatụ njikọta nke gallium selenide kristal nke nwere akwa nwere eriri micro-nano. Site n'iji uru nke kristal gallium selenide nke nwere usoro nke abụọ na-abụghị nke linearity na nhazi ogologo oge nke kristal gallium selenide mee ihe, a na-enweta usoro mkpali nke abụọ na-adakọ na mgbanwe ugboro ugboro dị iche iche, na-enye ngwọta ọhụrụ maka imeziwanye usoro multi-parametric na eriri na nkwadebe nke broadband nke abụọ-harmonicisi mmalite ọkụMmetụta dị irè nke mmetụta nke ugboro abụọ nke harmonic na sum na atụmatụ ahụ dabere na ọnọdụ atọ dị mkpa ndị a: anya mmekọrịta dị ogologo n'etiti gallium selenide naeriri micro-nano, usoro nke abụọ dị elu nke na-abụghị nke akara na usoro ogologo nke kristal gallium selenide dị n'ime akwa, yana ọnọdụ nhazi nke usoro nke ugboro ugboro na usoro ugboro abụọ nke isi.

N'ime nnwale ahụ, eriri micro-nano nke sistemụ mgbape ọkụ na-akwado nwere mpaghara kọn otu n'usoro nke milimita, nke na-enye ogologo ọrụ na-abụghị ahịrị maka ọkụ mgbapụta na ebili mmiri harmonic nke abụọ. Polarisability nke abụọ nke kristal gallium selenide agbakwunyere gafere 170 pm/V, nke dị elu karịa polarisability nke eriri anya na-abụghị ahịrị. Ọzọkwa, nhazi ogologo oge nke kristal gallium selenide na-eme ka nnyonye anya na-aga n'ihu nke harmonics nke abụọ, na-enye ohere zuru oke maka uru nke ogologo ọrụ na-abụghị ahịrị na eriri micro-nano. Ihe kacha mkpa bụ na a na-ahụ njikọ nke usoro dị n'etiti ụdị ntọala pumping optical (HE11) na ụdị harmonic nke abụọ (EH11, HE31) site na ijikwa dayameta cone wee chịkwaa mgbasa waveguide n'oge nkwadebe nke eriri micro-nano.

Ọnọdụ ndị dị n'elu tọrọ ntọala maka mkpali dị irè na nke sara mbara nke harmonics nke abụọ na eriri micro-nano. Nnwale ahụ na-egosi na enwere ike nweta mmepụta nke harmonics nke abụọ na ọkwa nanowatt n'okpuru mgbapụta laser picosecond pulse 1550 nm, a pụkwara ịkpalite harmonics nke abụọ nke ọma n'okpuru mgbapụta laser na-aga n'ihu nke otu ogologo ebili mmiri ahụ, ike njedebe dịkwa ala dị ka ọtụtụ narị microwatts (Foto 1). Ọzọkwa, mgbe a gbatịpụrụ ọkụ mgbapụta ahụ ruo ogologo ebili mmiri atọ dị iche iche nke laser na-aga n'ihu (1270/1550/1590 nm), a na-ahụ harmonics nke abụọ atọ (2w1, 2w2, 2w3) na akara ugboro ugboro atọ (w1+w2, w1+w3, w2+w3) na nke ọ bụla n'ime ogologo ebili mmiri mgbanwe ugboro isii ahụ. Site n'iji isi iyi ọkụ nke na-enye ìhè na-enwu enwu nke ukwuu (SLED) dochie ọkụ mgbapụta ahụ na bandwidth nke 79.3 nm, a na-emepụta harmonic nke abụọ sara mbara nke nwere bandwidth nke 28.3 nm (Foto nke 2). Na mgbakwunye, ọ bụrụ na enwere ike iji teknụzụ nchekwa anwụrụ kemịkalụ dochie teknụzụ mbufe akọrọ na ọmụmụ ihe a, na enwere ike itolite obere akwa kristal gallium selenide n'elu eriri micro-nano n'ebe dị anya, a na-atụ anya na arụmọrụ mgbanwe harmonic nke abụọ ga-aka mma.

FIG. 1 Sistemụ mmepụta harmonic nke abụọ na nsonaazụ nke nhazi eriri niile

Foto nke 2 Ngwakọta ọtụtụ ebili mmiri na harmonics nke abụọ dị obosara n'okpuru mgbapụta anya na-aga n'ihu