Kunakidzwa kwechipiri harmonics mune yakakura spectrum

Kunakidzwa kwechipiri harmonics mune yakakura spectrum

Kubva pakuwanikwa kwechipiri-yekurongeka isina mutsara optical mhedzisiro mu1960s, yakamutsa kufarira kwakakura kwevanoongorora, kusvika parizvino, zvichibva pane yechipiri harmonic, uye frequency mhedzisiro, yakagadzira kubva kune yakanyanyisa ultraviolet kusvika kure infrared band ye.lasers, yakakurudzira zvikuru kukura kwe laser,opticalkugadzirisa ruzivo, yakakwirira-resolution microscopic imaging uye mamwe minda. Maererano nonlinearopticsuye polarization theory, iyo even-order nonlinear optical effect yakanyatsoenderana necrystal symmetry, uye iyo nonlinear coefficient haisi zero chete mune isiri-central inversion symmetric media. Seyakanyanya kukosha yechipiri-yekurongeka isina mutsetse mhedzisiro, yechipiri harmonics inotadzisa zvakanyanya chizvarwa chavo uye inobudirira kushandiswa muquartz fiber nekuda kweamorphous fomu uye symmetry yepakati inversion. Parizvino, nzira dzepolarization (optical polarization, thermal polarization, electric field polarization) inogona kuparadza symmetry yezvinhu centre inversion yefiber optical, uye zvinobudirira kuvandudza yechipiri-kurongeka kusaenzana kwefiber optical. Nekudaro, iyi nzira inoda yakaoma uye inoda tekinoroji yekugadzirira, uye inogona chete kusangana neiyo quasi-chikamu chekufananidza mamiriro pane discrete wavelengths. Iyo optical fiber resonant mhete yakavakirwa pane echo madziro modhi inodzika yakafara spectrum excitation yechipiri harmonics. Nekutyora symmetry yechimiro chepamusoro chefayibha, iyo yepamusoro yechipiri harmonics mune yakakosha chimiro faibha inokwidziridzwa kune imwe nhanho, asi zvakadaro zvinoenderana nefemtosecond pombi pulse ine yakanyanya simba repamusoro. Naizvozvo, chizvarwa chechipiri-yekurongeka isiri-linear optical mhedzisiro mune ese-fiber zvimiro uye kuvandudzwa kweshanduko inoshanda, kunyanya chizvarwa cheyakakura-spectrum yechipiri harmonics mune yakaderera-simba, inoenderera optical kupomba, ndiwo matambudziko akakosha anoda kugadziriswa. mumunda we nonlinear fiber optics uye zvishandiso, uye zvine kukosha kwesainzi kukosha uye kukosha kwekushandisa kwakakura.

Chikwata chekutsvagisa kuChina chakurudzira gallium selenide crystal phase yekubatanidza chirongwa chine micro-nano fiber. Nekutora mukana weiyo yepamusoro yechipiri-yekurongeka isina kurongeka uye kureba-kurongeka kwegallium selenide makristasi, yakafara-spectrum yechipiri-harmonic excitation uye akawanda-frequency kutendeuka maitiro anoitika, ichipa mhinduro nyowani yekusimudzira akawanda-parametric maitiro mu. fiber uye kugadzirira kwebroadband yechipiri-harmonicmagetsi. Iyo inobudirira excitation yechipiri harmonic uye sum frequency effect muchirongwa chinonyanya kuenderana neanotevera matatu akakosha mamiriro: kureba kwechiedza-nyaya yekudyidzana kureba pakati pe gallium selenide uye.micro-nano fiber, iyo yechipiri-yepamusoro-yekurongeka isina mutsara uye yakareba-yakareba kurongeka kweakafukidzwa gallium selenide crystal, uye chikamu chekufananidza mamiriro eiyo yakakosha frequency uye frequency kaviri modhi inogutsikana.

Mukuedza, iyo micro-nano fiber yakagadzirirwa neflame scanning tapering system ine yunifomu yekoni dunhu muhurongwa hwemillimeter, iyo inopa kureba kwekuita kwekuita kureba kwechiedza chepombi uye yechipiri harmonic wave. Yechipiri-yakarongeka isina mutsara polarizability ye-integrated gallium selenide crystal inopfuura 170 pm / V, iyo yakakwirira zvikuru kupfuura intrinsic nonlinear polarizability ye optical fiber. Uyezve, iyo yakareba yakarongedzerwa chimiro che gallium selenide crystal inovimbisa kuenderera kwechikamu kupindira kwechipiri harmonics, ichipa kutamba kwakazara kune mukana wehurefu husina mutsara hwekuita mu micro-nano fiber. Zvinotonyanya kukosha, chikamu chinofananidzwa pakati pekupomba optical base mode (HE11) uye yechipiri harmonic yakakwira kurongeka modhi (EH11, HE31) inowanikwa nekudzora dhayamita yekoni uyezve kudzora kupararira kwemafungu panguva yekugadzirira micro-nano fiber.

Mamiriro ari pamusoro apa anoisa hwaro hweiyo inoshanda uye yakafara-bhendi mafambiro echipiri harmonics mu micro-nano fiber. Kuedza kunoratidza kuti kubuda kwechipiri harmonics padanho re nanowatt kunogona kuwanikwa pasi pe 1550 nm picosecond pulse laser pombi, uye yechipiri harmonics inogonawo kufara zvakanaka pasi peinoenderera mberi laser pombi yewavelength yakafanana, uye simba rechikumbaridzo rakafanana. yakaderera semazana akati wandei microwatts (Mufananidzo 1). Kupfuurirazve, kana mwenje wepombi uchiwedzerwa kune matatu akasiyana wavelengths yekuenderera mberi laser (1270/1550/1590 nm), matatu echipiri harmonics (2w1, 2w2, 2w3) uye matatu sum frequency masaini (w1+w2, w1+w3, w2+) w3) inocherechedzwa pane imwe neimwe yeatanhatu frequency kutendeuka wavelengths. Nekutsiva mwenje wepombi neiyo ultra-radiant light-emitting diode (SLED) light source ine bandwidth ye79.3 nm, yakakura-spectrum yechipiri harmonic ine bandwidth ye28.3 nm inogadzirwa (Mufananidzo 2). Uye zvakare, kana kemikari vapor deposition tekinoroji inogona kushandiswa kutsiva iyo yakaoma kutamisa tekinoroji muchidzidzo ichi, uye mashoma akaturikidzana egallium selenide makristasi anogona kukura pamusoro peiyo micro-nano fiber pamusoro pemadaro marefu, yechipiri harmonic kutendeuka kushanda zvakanaka inotarisirwa. kuti iwedzere kuvandudzwa.

FIG. 1 Yechipiri harmonic chizvarwa system uye inoguma mune yese-fiber chimiro

Mufananidzo 2 Multi-wavelength kusanganisa uye yakafara-spectrum yechipiri harmonics pasi pekuenderera kwepombi yekupomba.