Ho hlohlelletsa ha li-harmoniki tsa bobeli ka bongata bo boholo

Ho hlohlelletsa ha li-harmoniki tsa bobeli ka bongata bo boholo

Ho tloha ha ho sibolloa ha liphello tsa mahlo tse seng tsa mola oa bobeli lilemong tsa bo-1960, ho tsositse thahasello e kholo ea bafuputsi, ho fihlela joale, ho latela liphello tsa bobeli tsa harmonic, le tsa maqhubu, ho hlahisitse ho tloha mahlaseling a feteletseng a ultraviolet ho ea ho sehlopha sa infrared se hole sali-laser, e khothalelitse haholo nts'etsopele ea laser,leselits'ebetso ea tlhahisoleseling, litšoantšo tse nyenyane tse nang le qeto e phahameng le masimo a mang.mabone a ponole khopolo-taba ea polarization, phello ea optical ea even-order nonlinear e amana haufi-ufi le symmetry ea kristale, 'me coefficient ea nonlinear ha se zero feela mecheng ea symmetry ea inversion e seng bohareng. E le phello ea motheo ea bobeli ea nonlinear, li-harmonics tsa bobeli li sitisa haholo tlhahiso ea tsona le ts'ebeliso e sebetsang ea fiber ea quartz ka lebaka la sebopeho se sa fetoheng le symmetry ea inversion ea bohareng. Hona joale, mekhoa ea polarization (polarization ea optical, polarization ea mocheso, polarization ea tšimo ea motlakase) e ka senya ka maiketsetso symmetry ea inversion ea setsi sa thepa ea fiber ea optical, 'me ea ntlafatsa ka katleho ho se lumellane ha tatellano ea bobeli ea fiber ea optical. Leha ho le joalo, mokhoa ona o hloka theknoloji e rarahaneng le e hlokang ho lokisoa, 'me e ka fihlela maemo a ho bapisa a quasi-phase feela maqhubung a fapaneng. Lesale la resonant la fiber ea optical le thehiloeng mokhoeng oa lebota la echo le fokotsa ho hlasimolla ha li-harmonics tsa bobeli. Ka ho roba symmetry ea sebopeho sa bokaholimo ba fiber, li-harmonics tsa bobeli tsa bokaholimo ka har'a fiber ea sebopeho se khethehileng lia ntlafatsoa ho isa bohōleng bo itseng, empa li ntse li itšetlehile ka pulse ea pompo ea femtosecond ka matla a phahameng haholo a peak. Ka hona, tlhahiso ea liphello tsa optical tse seng tsa mola oa bobeli meahong ea fiber eohle le ntlafatso ea katleho ea phetoho, haholo-holo tlhahiso ea li-harmonics tsa bobeli tse pharaletseng ka har'a pompe ea optical e sa feleng, ke mathata a mantlha a hlokang ho rarolloa tšimong ea li-fiber optics le lisebelisoa tse seng tsa mola oa bobeli, 'me li na le bohlokoa ba bohlokoa ba saense le bohlokoa ba ts'ebeliso e pharaletseng.

Sehlopha sa bafuputsi Chaena se hlahisitse morero oa ho kopanya karolo ea kristale ea gallium selenide e nang le mekhahlelo e nang le faeba ea micro-nano. Ka ho sebelisa monyetla oa ho se lumellane ha maemo a holimo a bobeli le tatellano e telele ea likristale tsa gallium selenide, ho hlahisoa mokhoa oa ho hlohlelletsa oa harmonic ea bobeli oa mahlakore a mangata le phetoho ea maqhubu a mangata, ho fana ka tharollo e ncha bakeng sa ntlafatso ea lits'ebetso tsa parametric tse ngata ka har'a faeba le ho lokisoa ha harmonic ea bobeli ea broadband.mehloli ea leseli. Ho hlohlelletsa ka katleho ha phello ea bobeli ea harmonic le kakaretso ea maqhubu morerong ho itšetlehile haholo-holo ka maemo a mararo a bohlokoa a latelang: sebaka se selelele sa tšebelisano-'moho ea leseli le matter pakeng tsa gallium selenide lefaeba e nyenyane ea nano, ho se latele hantle ha maemo a bobedi le tatellano e telele ya kristale ya gallium selenide e nang le mealo, le maemo a ho bapisa mekhahlelo ya mokgwa wa motheo wa maqhubu le ho imena habeli ha maqhubu di kgotsofaditswe.

Tekong ena, faeba ya micro-nano e lokisitsweng ke sistimi ya ho tjheka ya malakabe e na le sebaka sa khoune se tshwanang ka tatellano ya millimeter, e fanang ka bolelele bo bolelele ba ketso e seng mola bakeng sa lesedi la pompo le leqhubu la bobedi la harmonic. Polarizability ya tatellano ya bobedi ya kristale e kopaneng ya gallium selenide e feta 170 pm/V, e leng e phahameng haholo ho feta polarizability ya kahare ya nonlinear ya faeba ya optical. Ho feta moo, sebopeho se laetsweng sa nako e telele sa kristale ya gallium selenide se netefatsa tšitiso ya mohato e tswelang pele ya diharmoniki tsa bobedi, e leng se fanang ka tshebetso e felletseng molemong wa bolelele bo boholo ba ketso e seng mola ka hara faeba ya micro-nano. Habohlokoa le ho feta, ho bapisa mohato pakeng tsa mokgwa wa motheo wa optical pumping (HE11) le mokgwa wa bobedi wa ho laola o phahameng wa harmonic (EH11, HE31) ho etswa ka ho laola bophara ba khoune ebe ho laolwa ho hasana ha waveguide nakong ya ho lokisa faeba ya micro-nano.

Maemo a ka hodimo a thehile motheo wa ho hlohlelletsa diharmoniki tsa bobedi ka bokgoni le ka bophara ba modumo wa di-harmoniki tsa bobedi ka hara faeba ya micro-nano. Teko e bontsha hore tlhahiso ya di-harmoniki tsa bobedi boemong ba nanowatt e ka fihlellwa tlasa pompo ya laser ya picosecond pulse ya 1550 nm, mme di-harmoniki tsa bobedi le tsona di ka hlohlelletswa ka katleho tlasa pompo ya laser e tswelang pele ya bolelele bo tshwanang, mme matla a moedi a tlase ho di-microwave tse makgolo a mmalwa (Setshwantsho sa 1). Ho feta moo, ha lesedi la pompo le atolosetswa ho maqhubu a mararo a fapaneng a laser e tswelang pele (1270/1550/1590 nm), di-harmoniki tsa bobedi tse tharo (2w1, 2w2, 2w3) le matshwao a mararo a kakaretso ya maqhubu (w1+w2, w1+w3, w2+w3) di bonwa ho e nngwe le e nngwe ya maqhubu a tsheletseng a phetoho ya maqhubu. Ka ho nkela lebone la pompo sebaka ka mohloli oa leseli o ntšang khanya o matla haholo (SLED) ka bandwidth ea 79.3 nm, harmonic ea bobeli ea wide-spectrum e nang le bandwidth ea 28.3 nm e hlahisoa (Setšoantšo sa 2). Ho phaella moo, haeba theknoloji ea ho boloka mouoane oa lik'hemik'hale e ka sebelisoa ho nkela theknoloji ea phetisetso e omileng sebaka thutong ena, 'me ho ka lengoa likarolo tse fokolang tsa likristale tsa gallium selenide holim'a faeba ea micro-nano libakeng tse telele, ho lebeletsoe hore katleho ea phetoho ea bobeli ea harmonic e ntlafatsoe haholoanyane.

Setšoantšo sa 1 Sistimi ea bobeli ea tlhahiso ea harmonic le liphetho tsa sebopeho sa fiber eohle

Setšoantšo sa 2 Ho kopanya maqhubu a mangata le li-harmonics tsa bobeli tsa wide-spectrum tlas'a ho pompa ha optical ho tsoelang pele