ʻĀpana laser ultrafast kū hoʻokahi

Kū hoʻokahilaser wikiwiki loaʻāpana ʻekahi

Nā waiwai kūikawā o ka ultrafastnā lasers
ʻO ka lōʻihi o ka pulse pōkole loa o nā lasers ultrafast e hāʻawi i kēia mau ʻōnaehana i nā waiwai kū hoʻokahi e hoʻokaʻawale iā lākou mai nā lasers pulse lōʻihi a i ʻole nā ​​​​​​nalu hoʻomau (CW). I mea e hana ai i kēlā pulse pōkole, pono ka bandwidth spectrum ākea. ʻO ke ʻano o ka pulse a me ka nalu waena e hoʻoholo i ka bandwidth liʻiliʻi loa e pono ai e hana i nā pulse o kahi lōʻihi. ʻO ka maʻamau, ua wehewehe ʻia kēia pilina ma ke ʻano o ka huahana bandwidth manawa (TBP), i loaʻa mai ke kumumanaʻo maopopo ʻole. Hāʻawi ʻia ka TBP o ka pulse Gaussian e kēia formula: TBPGaussian=ΔτΔν≈0.441
ʻO Δτ ka lōʻihi o ka pulse a ʻo Δv ka bandwidth alapine (frequency bandwidth). Ma ke ʻano nui, hōʻike ka hoohalike he pilina inverse ma waena o ka bandwidth spectrum a me ka lōʻihi o ka pulse, ʻo ia hoʻi, i ka emi ʻana o ka lōʻihi o ka pulse, piʻi ka bandwidth e pono ai e hana i kēlā pulse. Hōʻike ka Kiʻi 1 i ka bandwidth liʻiliʻi loa e pono ai e kākoʻo i kekahi mau lōʻihi o ka pulse like ʻole.

Kiʻi 1: Ka bandwidth spectral liʻiliʻi loa e pono ai ke kākoʻonā pulse lasero 10 ps (ʻōmaʻomaʻo), 500 fs (polū), a me 50 fs (ʻulaʻula)

Nā pilikia loea o nā lasers ultrafast
Pono e hoʻokele pono ʻia ka bandwidth spectral ākea, ka mana kiʻekiʻe, a me ka lōʻihi pulse pōkole o nā lasers ultrafast i loko o kāu ʻōnaehana. ʻO ka pinepine, ʻo kekahi o nā hopena maʻalahi loa i kēia mau pilikia ʻo ia ka hoʻopuka spectrum ākea o nā lasers. Inā ua hoʻohana nui ʻoe i nā lasers pulse lōʻihi a i ʻole nā ​​​​​​nalu hoʻomau i ka wā ma mua, ʻaʻole paha e hiki i kāu waihona o nā ʻāpana optical ke hōʻike a hoʻouna paha i ka bandwidth piha o nā pulses ultrafast.

Ka paepae hōʻino laser
Loaʻa i nā optics Ultrafast nā paepae hōʻino laser (LDT) ʻokoʻa loa a ʻoi aku ka paʻakikī o ka hoʻokele ʻana i nā paepae hōʻino laser (LDT) i hoʻohālikelike ʻia me nā kumu laser maʻamau. Ke hāʻawi ʻia nā optics nonā lasers pulsed nanosecond, ʻo nā waiwai LDT maʻamau ma ke ʻano o 5-10 J/cm2. No nā optics ultrafast, ʻaʻole i lohe ʻia nā waiwai o kēia nui, ʻoiai ʻoi aku ka nui o nā waiwai LDT ma ke ʻano o <1 J/cm2, kokoke i ka 0.3 J/cm2. ʻO ka ʻokoʻa koʻikoʻi o ka amplitude LDT ma lalo o nā lōʻihi pulse like ʻole ka hopena o ka mīkini hōʻino laser e pili ana i nā lōʻihi pulse. No nā lasers nanosecond a ʻoi aku pahanā lasers pulsed, ʻo ke ʻano hana nui e hōʻino ai, ʻo ia ka hoʻomehana wela. ʻO nā mea uhi a me nā mea substrate o kanā mea hana makaomo i nā photons hanana a hoʻomehana iā lākou. Hiki i kēia ke alakaʻi i ka hoʻopilikia ʻana o ka lattice kristal o ka mea. ʻO ka hoʻonui wela, ka haki ʻana, ka heheʻe ʻana a me ke kaumaha lattice nā ʻano hana hōʻino wela maʻamau o kēia mau meanā kumu laser.

Eia nō naʻe, no nā lasers ultrafast, ʻoi aku ka wikiwiki o ka lōʻihi o ka pulse ma mua o ka manawa o ka hoʻoili wela mai ka laser a i ka lattice mea, no laila ʻaʻole ka hopena wela ke kumu nui o ka hōʻino ʻia e ka laser. Akā, ʻo ka mana kiʻekiʻe o ka laser ultrafast e hoʻololi i ka mīkini hōʻino i nā kaʻina hana nonlinear e like me ka multi-photon absorption a me ka ionization. ʻO ia ke kumu ʻaʻole hiki ke hoʻohaʻahaʻa wale i ka helu LDT o kahi pulse nanosecond i ko kahi pulse ultrafast, no ka mea, ʻokoʻa ke ʻano kino o ka hōʻino. No laila, ma lalo o nā kūlana hoʻohana like (e laʻa, ka wavelength, ka lōʻihi o ka pulse, a me ka helu hana hou ʻana), ʻo kahi mea optical me ka helu LDT kiʻekiʻe e lilo i mea optical maikaʻi loa no kāu noi kikoʻī. ʻAʻole hōʻike nā Optics i hoʻāʻo ʻia ma lalo o nā kūlana like ʻole i ka hana maoli o nā optics like i loko o ka ʻōnaehana.

Kiʻi 1: Nā ʻano hana o ka hōʻino ʻia e ka laser me nā lōʻihi pulse like ʻole