Sub-20 femtosecond ike ia malamalama tunable pulsed kumu laser

Ma lalo o 20 femtosecond kukui ʻike ʻiapuna laser pulsed tunable

I kēia mau lā, ua paʻi kahi hui noiʻi mai UK i kahi noiʻi hou, e hoʻolaha ana ua hoʻomohala lākou i kahi megawatt-level sub-20 femtosecond ʻike maka uila.puna laser pulsed. ʻO kēia kumu laser pulsed, ultrafastfiber laserHiki i ka ʻōnaehana ke hana i nā pulses me nā lōʻihi hawewe hiki ke hoʻokō ʻia, nā lōʻihi pōkole loa, ka ikaika e like me 39 nanojoules, a me ka mana kiʻekiʻe ma mua o 2 megawatts, e wehe ana i nā noi noi hou no nā kahua e like me ka ultrafast spectroscopy, biological imaging, a me ka hana ʻoihana.

ʻO ka mea koʻikoʻi o kēia ʻenehana aia i ka hui pū ʻana o ʻelua mau ala ʻoki: "Gain-Managed nonlinear Amplification (GMNA)" a me "Resonant Dispersive Wave (RDW) emission". I ka wā ma mua, no ka loaʻa ʻana o nā pulse ultrashshort hiki ke hoʻokō kiʻekiʻe, ʻoi aku ka maʻamau o nā lasers titanium-sapphire paʻakikī a i ʻole nā ​​​​amplifiers optical parametric. ʻAʻole wale ke kumu kūʻai, paʻakikī, a paʻakikī hoʻi ka mālama ʻana i kēia mau mea hana, akā ua kaupalena ʻia hoʻi e nā helu haʻahaʻa haʻahaʻa a me nā pae hoʻolohe. ʻAʻole i hoʻomaʻamaʻa wale ka ʻōnaehana fiber a pau i kēia manawa akā hoʻemi nui i nā kumukūʻai a me ka paʻakikī. Hiki iā ia ke hana pololei o sub-20 femtosecond, hiki i ka 400 a 700 nanometers a ma waho aʻe o nā pulses mana kiʻekiʻe ma ke alapine repetition kiʻekiʻe o 4.8 MHz. Ua hoʻokō ka hui noiʻi i kēia holomua ma o ka hoʻolālā ʻōnaehana i hoʻolālā pololei ʻia. ʻO ka mea mua, ua hoʻohana lākou i kahi oscillator ytterbium fiber oscillator i hoʻopaʻa ʻia i ka polarization-preserving mode e pili ana i ka nonlinear amplification ring mirror (NALM) e like me ke kumu hua. ʻO kēia hoʻolālā ʻaʻole wale e hōʻoia i ka paʻa lōʻihi o ka ʻōnaehana, akā pale pū nō hoʻi i ka pilikia degradation o ke kino saturated absorbers. Ma hope o ka preamplification a me ka hoʻopaʻa ʻana i ka pulse, hoʻokomo ʻia nā pulu hua i ka pae GMNA. Hoʻohana ʻo GMNA i ka modulation self-phase a me ka loaʻa ʻana o ka loaʻa asymmetric longitudinal i nā fiber optical e hoʻokō i ka hoʻonui spectral a hoʻoulu i nā pulses ultrashort me nā leo laina laina kūpono loa, i hoʻopaʻa ʻia i ka sub-40 femtoseconds ma o ka grating pairs. I ka wā o ka hanauna RDW, ua hoʻohana nā mea noiʻi i hoʻolālā ponoʻī a hana ʻia i ʻeiwa-resonator anti-resonance hollow-core fibers. ʻO kēia ʻano fiber optical he haʻahaʻa haʻahaʻa loa i loko o ka puʻupuʻu puʻupuʻu puʻupuʻu a me ka ʻāpana māmā ʻike ʻia, hiki ke hoʻololi maikaʻi ʻia ka ikehu mai ka pāpaʻi i ka nalu i hoʻopuehu ʻia a pale aku i ka hoʻopilikia ʻia e ka hui resonant kiʻekiʻe. Ma lalo o nā kūlana maikaʻi loa, hiki i ka dispersion wave pulse energy output e ka ʻōnaehana hiki ke hiki i 39 nanojoules, hiki i ka laulā pulse pōkole loa ke hiki i 13 femtoseconds, hiki ke kiʻekiʻe ka mana kiʻekiʻe e like me 2.2 megawatts, a hiki ke kiʻekiʻe ka hoʻololi ʻana o ka ikehu e like me 13%. ʻOi aku ka hauʻoli ma ka hoʻoponopono ʻana i ke kaomi kinoea a me nā ʻāpana fiber, hiki ke maʻalahi ka ʻōnaehana i nā kaula ultraviolet a me ka infrared, e hoʻokō ai i ka hoʻokani ʻana i ka wideband mai ka ultraviolet hohonu a i ka infrared.

ʻAʻole paʻa wale kēia noiʻi i ka mea koʻikoʻi ma ke kahua kumu o nā photonics, akā wehe pū kekahi i kahi kūlana hou no ka ʻoihana a me nā kahua noi. No ka laʻana, ma nā kahua e like me ka multi-photon microscopy imaging, ultrafast time-resolved spectroscopy, material processing, precision medicine, a me ultrafast nonlinear optics noiʻi, e hāʻawi kēia ʻano ʻano māmā ultrafast hou i nā mea hoʻohana i nā mea hana a me ka maʻalahi. ʻOi aku i nā hiʻohiʻona e koi ana i nā helu hoʻopiʻi kiʻekiʻe, ka mana kiʻekiʻe a me nā pulses ultra-pōkole, ʻoi aku ka hoʻokūkū o kēia ʻenehana a ʻoi aku ka nui o ka hoʻolaha ʻana i hoʻohālikelike ʻia me nā ʻōnaehana titanium-sapphire a i ʻole optical parametric amplification system.

I ka wā e hiki mai ana, hoʻolālā ka hui noiʻi e hoʻonui hou i ka ʻōnaehana, e like me ka hoʻohui ʻana i ka hale hoʻolālā o kēia manawa i loaʻa i nā ʻāpana optical free-space i nā fibers 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 like ʻole o ka anti-resonance fibers, ka hoʻokomo ʻana i nā kinoea hana Raman a me nā modula pālua pinepine, ua manaʻo ʻia e hoʻonui ʻia kēia ʻōnaehana i kahi hui ākea, e hāʻawi ana i nā mea āpau-fiber, wideband, ultrafast laser solutions no nā māla he nui e like me ka ultraviolet, ʻike ʻia a me ka infrared.

Kiʻi 1. Kiʻi kiʻi o ke kani ʻana o ka laser pulsed