Kumu laser pulsed hiki ke hoʻololi ʻia me ka mālamalama ʻike maka sub-20 femtosecond

Mālamalama ʻike ʻia ma lalo o 20 femtosecondkumu laser pulsed hiki ke hoʻololi ʻia

I kēia mau lā iho nei, ua paʻi kahi hui noiʻi mai UK i kahi noiʻi hou, e hoʻolaha ana ua hoʻomohala pono lākou i kahi kukui ʻike maka sub-20 femtosecond megawatt-level hiki ke hoʻololi ʻia.kumu laser pulsedʻO kēia kumu laser pulsed, wikiwiki loalaser fiberhiki i ka ʻōnaehana ke hoʻopuka i nā pulse me nā nalu hiki ke hoʻololi ʻia, nā lōʻihi pōkole loa, nā ikehu e like me 39 nanojoules, a me ka mana kiʻekiʻe e ʻoi aku ma mua o 2 megawatts, e wehe ana i nā manaʻolana noi hou no nā kahua e like me ka spectroscopy ultrafast, ke kiʻi ʻana i ke olaola, a me ka hana ʻana i ka ʻoihana.

ʻO ke kumu nui o kēia ʻenehana aia i ka hui pū ʻana o ʻelua mau ʻano hana ʻoi loa: "Gain-Managed nonlinear Amplification (GMNA)" a me ka "Resonant Dispersive Wave (RDW) emission". I ka wā ma mua, no ka loaʻa ʻana o ia mau pulse ultrashshort tunable kiʻekiʻe, pono pinepine nā laser titanium-sapphire pipiʻi a paʻakikī a i ʻole nā ​​​​amplifier parametric optical. ʻAʻole wale kēia mau mea hana he pipiʻi, nui, a paʻakikī ke mālama, akā ua kaupalena ʻia hoʻi e nā helu hana hou haʻahaʻa a me nā pae hoʻonohonoho. ʻO ka hoʻonā all-fiber i hoʻomohala ʻia i kēia manawa ʻaʻole wale ia e hoʻomaʻalahi nui i ka hoʻolālā ʻōnaehana akā hoʻemi nui hoʻi i nā kumukūʻai a me ka paʻakikī. Hiki iā ia ke hana pololei o sub-20 femtosecond, hiki ke hoʻonohonoho ʻia i 400 a 700 nanometers a ma ʻō aku o nā pulse mana kiʻekiʻe ma kahi alapine hana hou kiʻekiʻe o 4.8 MHz. Ua hoʻokō ka hui noiʻi i kēia holomua ma o kahi hoʻolālā ʻōnaehana i hoʻolālā pono ʻia. ʻO ka mea mua, ua hoʻohana lākou i kahi oscillator fiber ytterbium i hoʻopaʻa ʻia i ka polarization piha e pili ana i ka nonlinear amplification ring mirror (NALM) ma ke ʻano he kumu hua. ʻAʻole wale kēia hoʻolālā e hōʻoia i ke kūpaʻa lōʻihi o ka ʻōnaehana, akā pale pū kekahi i ka pilikia degradation o nā mea hoʻomoʻa saturated kino. Ma hope o ka preamplification a me ka pulse compression, hoʻokomo ʻia nā pulse hua i loko o ke kahua GMNA. Hoʻohana ʻo GMNA i ka modulation self-phase a me ka longitudinal asymmetric gain distribution i loko o nā fiber optical e hoʻokō i ka hoʻonui ʻana o ka spectral a hana i nā pulse ultrashort me ka chirp linear kokoke loa, kahi i hoʻopaʻa hope ʻia i lalo o 40 femtoseconds ma o nā hui grating. I ka wā o ke kahua hanauna RDW, ua hoʻohana nā mea noiʻi i hoʻolālā ponoʻī ʻia a hana i nā fibers hollow-core anti-resonance ʻeiwa-resonator. He haʻahaʻa loa ka pohō o kēia ʻano fiber optical i loko o ka pump pulse band a me ka ʻāpana kukui ʻike ʻia, e hiki ai ke hoʻololi pono ʻia ka ikehu mai ka pamu i ka nalu i hoʻopuehu ʻia a pale i ka hoʻopilikia ʻia e ka high-loss resonant band. Ma lalo o nā kūlana kūpono loa, hiki i ka ikehu pulse nalu hoʻopuehu i hoʻopuka ʻia e ka ʻōnaehana ke hiki i 39 nanojoules, ʻo ka laulā pulse pōkole loa hiki i 13 femtoseconds, hiki i ka mana kiʻekiʻe ke kiʻekiʻe i 2.2 megawatts, a hiki i ka pono o ka hoʻololi ikehu ke kiʻekiʻe i 13%. ʻOi aku ka hoihoi ma ka hoʻoponopono ʻana i ke kaomi kinoea a me nā palena fiber, hiki ke hoʻonui maʻalahi ʻia ka ʻōnaehana i nā kāʻei ultraviolet a me infrared, e hoʻokō ana i ka hoʻonohonoho wideband mai ka ultraviolet hohonu a i ka infrared.

ʻAʻole wale kēia noiʻi he mea nui i ke kahua kumu o ka photonics, akā wehe pū kekahi i kahi kūlana hou no nā kahua ʻoihana a me nā noi. No ka laʻana, ma nā kahua e like me ke kiʻi microscopy multi-photon, ultrafast time-resolved spectroscopy, material processing, precision medicine, a me ka noiʻi optics nonlinear ultrafast, ʻo kēia ʻano kukui ultrafast hou, kūpono, a haʻahaʻa ke kumukūʻai e hāʻawi i nā mea hoʻohana me nā mea hana a me ka maʻalahi i ʻike ʻole ʻia. ʻOi loa i nā hiʻohiʻona e koi ana i nā helu hana hou kiʻekiʻe, ka mana kiʻekiʻe a me nā pulse ultra-short, ʻoi aku ka hoʻokūkū o kēia ʻenehana a he nui ka hiki ke hoʻolaha ʻia i hoʻohālikelike ʻia me nā ʻōnaehana hoʻonui titanium-sapphire a i ʻole optical parametric.

I ka wā e hiki mai ana, hoʻolālā ka hui noiʻi e hoʻomaikaʻi hou aku i ka ʻōnaehana, e like me ka hoʻohui ʻana i ke ʻano hana o kēia manawa e loaʻa ana nā ʻāpana optical free-space he nui i loko o nā fiber optical, a i ʻole ka hoʻohana ʻana i hoʻokahi oscillator Mamyshev e pani i ka hui oscillator a me ka amplifier o kēia manawa, i mea e hoʻokō ai i ka miniaturization a me ka hoʻohui ʻana o ka ʻōnaehana. Eia kekahi, ma ka hoʻololi ʻana i nā ʻano fibers anti-resonance like ʻole, ka hoʻolauna ʻana i nā kinoea hana Raman a me nā modula pālua alapine, manaʻo ʻia e hoʻonui ʻia kēia ʻōnaehana i kahi hui ākea, e hāʻawi ana i nā hopena laser ultrafast āpau-fiber, wideband, no nā kahua he nui e like me ka ultraviolet, ka mālamalama ʻike a me ka infrared.

Kiʻi 1. Kiʻikuhi kiʻikuhi o ke kau ʻana o ka laser pulsed