Mmalite nke harmonics nke abụọ na ụdị dị iche iche

Mmalite nke harmonics nke abụọ na ụdị dị iche iche

Ebe ọ bụ na nchoputa nke abụọ-usoro na-abụghị nke ngwa anya mmetụta na 1960, kpalitere mmasị dị ukwuu nke ndị na-eme nchọpụta, ka ọ dị ugbu a, dabere na nke abụọ harmonic, na ugboro mmetụta, emepụtala site na oké ultraviolet ruo na anya infrared band nke.lasers, na-akwalite mmepe nke laser;ngwa anyanhazi ozi, ihe onyonyo microscopic dị elu na mpaghara ndị ọzọ. Dị ka enweghị usorongwa anyana tiori polarization, mmetụta anya anya na-enweghị usoro na-enwe njikọ chiri anya na kristal symmetry, yana ọnụọgụ na-abụghị efu abụghị naanị na mgbasa ozi symmetrical inversion na-abụghị nke etiti. Dị ka ihe kachasị mkpa nke abụọ na-abụghị nke na-adịghị ahụkebe, nke abụọ harmonics na-egbochi ọgbọ ha nke ọma na iji quartz eme ihe dị irè n'ihi ọdịdị amorphous na symmetry nke ntụgharị etiti. Ka ọ dị ugbu a, ụzọ polarization (optical polarization, thermal polarization, electric field polarization) nwere ike ibibi symmetry nke ihe etiti ihe ngbanwe nke eriri anya, ma kwalite nke ọma n'usoro nke abụọ nke eriri anya. Agbanyeghị, usoro a chọrọ teknụzụ nkwadebe dị mgbagwoju anya na nke na-achọsi ike, ọ ga-enwe ike iru naanị ọnọdụ nha nha-phase na ogologo ogologo ogologo. Mgbanaka mgbanaka eriri anya nke dabere na ọnọdụ mgbanaka mgbanaka mgbanaka na-amachi oke mkpali dị iche iche nke harmonics nke abụọ. Site na-agbasa symmetry nke elu Ọdịdị nke eriri, elu nke abụọ harmonics na pụrụ iche Ọdịdị eriri na-enwekwukwa ruo n'ókè ụfọdụ, ma ka na-adabere femtosecond mgbapụta usu na nnọọ elu elu ike. Ya mere, ọgbọ nke abụọ-usoro na-abụghị nke ngwa anya mmetụta na niile-fiber owuwu na mma nke ntughari arụmọrụ, karịsịa ọgbọ nke obosara-ụdịdị dị iche iche nke abụọ harmonics na ala-ike, na-aga n'ihu ngwa anya pumping, bụ isi nsogbu ndị kwesịrị idozi. na ubi nke na-abụghị online fiber optics na ngwaọrụ, na nwere mkpa sayensị pụtara na mbara ngwa uru.

Otu ndị nyocha na China atụpụtala atụmatụ njikọta nke gallium selenide crystal nke nwere obere micro-nano fiber. Site n'iji ohere dị elu nke abụọ na-adịghị na ntanetị na nhazi ogologo oge nke kristal gallium selenide, a na-enweta ihe mgbagwoju anya nke abụọ-harmonic excitation na multi-frequency ntụgharị usoro, na-enye ihe ngwọta ọhụrụ maka nkwalite nke multi-parametric usoro na. eriri na nkwadebe nke brọdband nke abụọ-harmonicisi mmalite ọkụ. Mmalite nke ọma nke mmetụta nkwekọ nke abụọ na nchikota n'ime atụmatụ a dabere na isi ọnọdụ atọ ndị a: ogologo mmekọrịta ọkụ-ihe dị anya n'etiti gallium selenide namicro-nano eriri, usoro dị elu nke abụọ na-adịghị adị na ogologo ogologo nke gallium selenide crystal Layered, na ọnọdụ kwekọrọ na usoro nke isi ugboro na ugboro ugboro abụọ na-eju afọ.

N'ime nnwale ahụ, eriri micro-nano kwadebere site na sistemụ nyocha ọkụ ọkụ nwere mpaghara cone edo edo n'usoro nke milimita, nke na-enye ogologo ihe na-adịghị adị ogologo maka ọkụ mgbapụta na ebili mmiri nke abụọ. Polarizability nke abụọ na-adịghị n'usoro nke kristal gallium selenide agbakwunyere karịrị 170 pm/V, nke dị elu karịa ihe dị n'ime ahụ na-adịghị ahụ anya nke eriri anya. Ọzọkwa, usoro iwu ogologo ogologo nke kristal gallium selenide na-eme ka nnyonye anya na-aga n'ihu na-aga n'ihu nke nkwekọrịta nke abụọ, na-enye egwuregwu zuru oke maka uru nke nnukwu ihe omume na-adịghị adị na micro-nano fiber. Nke ka mkpa, usoro nke dabara n'etiti mgbapụta ngwa anya isi ọnọdụ (HE11) na nke abụọ harmonic high order mode (EH11, HE31) na-emezu site na ịchịkwa cone dayameta wee na-achịkwa mgbasa ozi waveguide n'oge nkwadebe nke micro-nano fiber.

Ọnọdụ ndị a dị n'elu na-atọ ntọala maka mkpali nke ọma na nke obosara nke abụọ harmonics na micro-nano fiber. Nnwale na-egosi na mmepụta nke abụọ harmonics na nanowatt larịị nwere ike nweta n'okpuru 1550 nm picosecond pulse laser mgbapụta, na nke abụọ harmonics nwekwara ike inwe obi ụtọ nke ọma n'okpuru mgbapụta laser na-aga n'ihu nke otu wavelength, na ike ọnụ ụzọ dị ka. obere dị ka ọtụtụ narị microwatts (Fig 1). Ọzọkwa, mgbe mgbapụta ọkụ gbatịrị atọ dị iche iche wavelengths nke na-aga n'ihu laser (1270/1550/1590 nm), atọ nke abụọ harmonics (2w1, 2w2, 2w3) na atọ nchikota akara ngosi (w1 + w2, w1 + w3, w2+). w3) ka a na-ahụ na nke ọ bụla n'ime ogologo ntụgharị ntụgharị ugboro isii. Site n'iji dochie ìhè mgbapụta ọkụ na-egbuke egbuke na-egbuke egbuke diode (SLED) nke nwere bandwit nke 79.3 nm, a na-emepụta ihe nkwekọ nke abụọ na bandwit nke 28.3 nm (Nyocha 2). Tụkwasị na nke a, ọ bụrụ na enwere ike iji nkà na ụzụ na-emepụta ihe na-emepụta ihe na-emepụta ihe iji dochie nkà na ụzụ mbufe akọrọ na ọmụmụ ihe a, na obere oyi akwa nke gallium selenide kristal nwere ike ịmalite n'elu micro-nano fiber n'ebe dị anya, a na-atụ anya ịrụ ọrụ ngbanwe nke abụọ. a ga-akawanye mma.

FIG. 1 Sistemụ harmonic nke abụọ wee rụpụta ihe niile nwere eriri

Ọgụgụ 2 Multi-wavelength mixing na wide-spectrum second harmonics n'okpuru mgbapụta ngwa anya na-aga n'ihu