Kuwanda kwesimba uye kuwanda kwesimba relaser

Kuwanda kwesimba uye kuwanda kwesimba relaser

Density huwandu hwemuviri hwatinonyatsoziva muhupenyu hwedu hwezuva nezuva, density yatinonyanya kubata ndeye density yezvinhu, fomura yacho ndeye ρ=m/v, kureva kuti, density yakaenzana nehuremu hwakakamurwa nevhoriyamu. Asi density yesimba uye density yelaser zvakasiyana, pano zvakakamurwa nenzvimbo kwete voriyamu. Simba ndirowo kusangana kwedu nehuwandu hwakawanda hwemuviri, nekuti tinoshandisa magetsi zuva rega rega, magetsi anosanganisira simba, iyo international standard unit yesimba ndiW, kureva kuti, J/s, ndiyo ratio yesimba nenguva unit, iyo international standard unit yesimba ndiJ. Saka density yesimba ipfungwa yekubatanidza simba nehuremu, asi heino nzvimbo yemwaranzi yenzvimbo pane voriyamu, simba rakakamurwa nenzvimbo yepositi isimba huremu, kureva kuti, iyo unit yesimba huremu ndiW/m2, uye mumunda welaser, nekuti nzvimbo yemwaranzi yelaser idiki, saka kazhinji W/cm2 inoshandiswa seyuniti. Huremu hwesimba hunobviswa kubva papfungwa yenguva, zvichibatanidza simba nehuremu, uye yuniti yacho iJ/cm2. Kazhinji, malaser anoenderera mberi anotsanangurwa achishandisa huremu hwesimba, nepomalaser ane pulsedZvinotsanangurwa uchishandisa simba rakawanda uye simba rakawanda.

Kana laser ichishanda, huwandu hwesimba hunowanzo sarudza kana muganho wekuparadza, kana kubvisa, kana zvimwe zvinhu zvinoshanda wasvika. Muganho ipfungwa inowanzo onekwa pakudzidza kudyidzana kwema laser nezvinhu. Pakudzidza kwe short pulse (inogona kutariswa se us stage), ultra-short pulse (inogona kutariswa se ns stage), uye kunyange ultra-fast (ps uye fs stage) laser interaction materials, vaongorori vekutanga vanowanzo tora pfungwa ye energy density. Pfungwa iyi, padanho rekudyidzana, inomiririra simba rinoshanda pane chinangwa pa unit area, kana iri laser ye level imwechete, hurukuro iyi inokosha zvikuru.

Kunewo muganho wehuwandu hwesimba remushonga wekurova kwemoyo kamwe chete. Izvi zvinoitawo kuti kudzidza nezvekudyidzana kwe laser-matter kuve kwakaoma. Zvisinei, michina yekuedza yanhasi iri kuchinja nguva dzese, hupamhi hwe pulse hwakasiyana-siyana, simba rekurova kwemoyo kamwe chete, frequency yekudzokorora uye mamwe ma parameter ari kuchinja nguva dzese, uye anotoda kufunga nezve kubuda chaiko kwe laser mukuchinja kwesimba rekurova kwemoyo kana simba rekurova rekuyerwa, kungave kwakaoma zvakanyanya. Kazhinji, zvinogona kufungidzirwa kuti huwandu hwesimba hwakakamurwa nehupamhi hwe pulse inguva yeavhareji yesimba rekurova (cherechedza kuti inguva, kwete nzvimbo). Zvisinei, zviri pachena kuti waveform chaiyo ye laser inogona kunge isiri rectangular, square wave, kana kunyange bell kana Gaussian, uye mamwe anotsanangurwa nemaitiro e laser pachayo, iyo yakaumbwa zvakanyanya.

Upamhi hwepulse hunowanzo kupihwa nehupamhi hwehafu-hurefu hunopiwa ne oscilloscope (full peak half-width FWHM), izvo zvinoita kuti tiverenge kukosha kwesimba remagetsi kubva kuhuwandu hwesimba, hwakakwira. Hafu yekukwirira nehupamhi hwakakodzera inofanira kuverengerwa ne integral, hafu yekukwirira nehupamhi. Hapana kuferefetwa kwakadzama kwekuti pane here chiyero chakakodzera chekuziva. Kune simba remagetsi pacharo, pakuita maverengero, zvinowanzo kwanisika kushandisa simba repulse rimwe chete kuverenga, simba repulse rimwe chete/hupamhi hwepulse/nzvimbo yenzvimbo, inova simba repakati penzvimbo, uye wobva wawedzerwa ne2, kune simba repamusoro penzvimbo (kugoverwa kwenzvimbo ndiko kugoverwa kweGauss kurapwa kwakadaro, top-hat haidi kudaro), uye wobva wawedzerwa ne radial distribution expression, Uye wapedza.