Kufadzwa kweharmoniki dzechipiri muhuwandu hwakakura
Kubva pakawanikwa mhedzisiro ye optical ye second-order nonlinear muma1960, yakamutsa kufarira kukuru kwevaongorori, kusvika pari zvino, zvichibva pane harmonic yechipiri, uye frequency effects, yakaburitsa kubva ku extreme ultraviolet kusvika ku far infrared band yelasers, yakakurudzira zvikuru kukura kwe laser,chiedzakugadzirisa ruzivo, mifananidzo ine hunyanzvi hwepamusoro-soro uye mimwe minda. Zvichienderana ne nonlinearopticsuye dzidziso yepolarization, even-order nonlinear optical effect yakabatana zvakanyanya ne crystal symmetry, uye nonlinear coefficient haisi zero chete mune non-central inversion symmetric media. Semhedzisiro yekutanga yesecond-order nonlinear, second harmonics inokanganisa kugadzirwa kwayo uye kushandiswa kwayo zvinobudirira mu quartz fiber nekuda kwechimiro chisina chimiro uye symmetry ye centre inversion. Parizvino, nzira dzepolarization (optical polarization, thermal polarization, electric field polarization) dzinogona kuparadza artificially symmetry ye material center inversion ye optical fiber, uye zvinobudirira kuvandudza second-order nonlinearity ye optical fiber. Zvisinei, nzira iyi inoda tekinoroji yakaoma uye inoda kugadzirira, uye inogona kungosangana nemamiriro ekufananidza e quasi-phase pa discrete wavelengths. Mhete ye optical fiber resonant yakavakirwa pa echo wall mode inoderedza wide spectrum excitation ye second harmonics. Nekuputsa symmetry ye surface structure ye fiber, surface second harmonics mu special structure fiber inowedzerwa kusvika pamwero wakati, asi ichiri kuvimba ne femtosecond pump pulse ine simba rakakwirira kwazvo re peak. Saka, kugadzirwa kwemhedzisiro ye optical ye second-order nonlinear mu all-fiber structures uye kuvandudzwa kwekushanda zvakanaka kwekushandura, kunyanya kugadzirwa kwe wide-spectrum second harmonics mu low-power, continuous optical pumping, ndiwo matambudziko makuru anofanirwa kugadziriswa mumunda we nonlinear fiber optics nemidziyo, uye ane kukosha kwakakosha kwesainzi uye kukosha kwekushandiswa kwakafara.
Chikwata chekutsvagisa muChina chakapa zano rekubatanidza gallium selenide crystal phase ne micro-nano fiber. Nekushandisa mukana we high-order second-order nonlinearity uye kurongeka kwenguva refu kwe gallium selenide crystals, nzira ye wide-spectrum second-harmonic excitation uye multi-frequency conversion process inowanikwa, zvichipa mhinduro itsva yekuvandudza maitiro akawanda eparametric mu fiber uye kugadzirira broadband second-harmonic.manyuko echiedzaKubudirira kwekukwezvwa kwechipiri che harmonic uye sum frequency effect muchirongwa ichi kunonyanya kutsamira pazvinhu zvitatu zvakakosha zvinotevera: kureba kwekubatana kwechiedza-chinhu pakati pegallium selenide nefaibha ye micro-nano, kusawirirana kwepamusoro-soro kwechipiri uye kurongeka kwenguva refu kwekristaro ye gallium selenide yakagadzika, uye mamiriro ekufananidza phase e fundamental frequency uye frequency doubling mode zvinogutswa.
Mukuyedza uku, fiber ye micro-nano yakagadzirwa ne flame scanning tapering system ine nzvimbo ye cone yakafanana muchimiro che millimeter, iyo inopa kureba kwenguva refu kwe nonlinear action ye pombi uye second harmonic wave. Second-order nonlinear polarizability ye integrated gallium selenide crystal inodarika 170 pm/V, iyo yakakwirira zvikuru kupfuura intransic nonlinear polarizability ye optical fiber. Uyezve, chimiro che long-range che gallium selenide crystal chinoita kuti pave nekupindirana kwechikamu chepiri che harmonics, zvichipa mukana wakazara wehukuru hukuru hwe nonlinear action mu micro-nano fiber. Chinonyanya kukosha ndechekuti, kuenderana kwechikamu pakati pe pumping optical base mode (HE11) uye second harmonic high order mode (EH11, HE31) kunowanikwa nekudzora dhayamita ye cone uye wozodzora waveguide dispersion panguva yekugadzirira micro-nano fiber.
Mamiriro ezvinhu ari pamusoro apa ndiwo anoisa hwaro hwekufambisa kwechipiri harmonics mu micro-nano fiber zvinobudirira uye zvakafara. Kuedza uku kunoratidza kuti kubuda kwechipiri harmonics padanho re nanowatt kunogona kuwanikwa pasi pe1550 nm picosecond pulse laser pump, uye yechipiri harmonics inogonawo kufambiswa zvakanaka pasi pe continuous laser pump ye wavelength imwe chete, uye simba re threshold rakaderera sema microwatts mazana akati wandei (Mufananidzo 1). Uyezve, kana chiedza chepombi chikatambanudzwa kusvika kuma wavelength matatu akasiyana e continuous laser (1270/1550/1590 nm), ma harmonics matatu e second (2w1, 2w2, 2w3) uye ma sum frequency signals matatu (w1+w2, w1+w3, w2+w3) anoonekwa pane imwe neimwe yema wavelengths matanhatu e frequency conversion. Nekutsiva mwenje wepombi nechiedza chinoburitsa chiedza cheultra-radiant light-emitting diode (SLED) nebandwidth ye79.3 nm, panobva pagadzirwa harmonic yechipiri ine bandwidth ye28.3 nm (Mufananidzo 2). Pamusoro pezvo, kana tekinoroji yemakemikari yekuburitsa vapor inogona kushandiswa kutsiva tekinoroji yekufambisa yakaoma muchidzidzo chino, uye makristaro mashoma egallium selenide anogona kukura pamusoro pe micro-nano fiber munzvimbo refu, kushanda kwechipiri kwe harmonic conversion kunotarisirwa kuvandudzwa zvakanyanya.
Mufananidzo 1 Sisitimu yechipiri yekugadzira harmonic uye mhedzisiro yechimiro che fiber yese
Mufananidzo 2 Kusanganisa mafungu akawanda uye maharmoniki echipiri e-wide-spectrum pasi pekupomba kwe optical kunoenderera mberi
Nguva yekutumira: Chivabvu-20-2024