A. Lingaliro la lasers ultrafast
Ma lasers a Ultrafast nthawi zambiri amatanthauza ma laser otsekeka omwe amagwiritsidwa ntchito kutulutsa ma pulses aafupi kwambiri, mwachitsanzo, nthawi ya femtosecond kapena picosecond.Dzina lolondola kwambiri lingakhale ultrashort pulse laser.Ma lasers a Ultrashort pulse amakhala pafupifupi okhoma ma lasers, koma phindu losinthira limathanso kupanga ma ultrashort pulses.
B. Mtundu wa laser ultrafast
1. Ti-sapphire lasers, nthawi zambiri Kerr lens mode-locked, imatha kutulutsa mpweya waufupi ngati 5 fs kutalika kwake.Mphamvu zawo zotulutsa nthawi zambiri zimakhala ma milliwatts mazana angapo, zobwerezabwereza za, titi, 80MHz ndi makumi a femtoseconds kapena kuchepera, ndi kugunda kwa makumi a femtoseconds kapena kuchepera, zomwe zimapangitsa mphamvu yapamwamba kwambiri.Koma ma lasers a titaniyamu-safire amafuna kupopera kuwala kuchokera ku ma laser ena obiriwira, zomwe zimawapangitsa kukhala ovuta komanso okwera mtengo.
2. Pali ma lasers osiyanasiyana a diode-pumped based on, mwachitsanzo, ytterbium-doped (crystal kapena glass) kapena chromium-doped laser crystals, omwe nthawi zambiri amagwiritsa ntchito SESAM passive mode-locking.Ngakhale kuti kugunda kwa ma lasers opopedwa ndi diode sikofupikitsa ngati kugunda kwa titaniyamu-sapphire lasers, ma laser opopedwa ndi diode amatha kuphimba dera lalikulu malinga ndi kutalika kwa kugunda, kubwereza kubwereza, komanso mphamvu yapakati (onani pansipa) .
3. Ma lasers opangidwa ndi magalasi opangidwa ndi zinthu zapadziko lapansi osowa amathanso kukhala otsekeka, mwachitsanzo, pogwiritsa ntchito polarization rotation kapena SESAM.Ndiwocheperako kuposa ma lasers ambiri malinga ndi mphamvu yapakati, makamaka mphamvu yapamwamba, koma imatha kuphatikizidwa mosavuta ndi ma fiber amplifiers.Nkhani yokhudza ma mode-locked fiber lasers imapereka zambiri.
(4) lasers mode-zokhoma diode akhoza kukhala zipangizo zofunika kapena kunja patsekeke diode lasers, ndipo akhoza yogwira, kungokhala chete kapena osakaniza mode-zokhoma.Nthawi zambiri, ma laser otsekera a diode amagwira ntchito mokweza kwambiri (ma megahertz zikwi zingapo) kubwereza kwa kugunda kwamphamvu pang'onopang'ono.
Ultrafast laser oscillators akhoza kukhala mbali ya ultrafast laser systems, yomwe ingaphatikizepo ultrafast amplifier (monga fiber optic amplifier) kuti awonjezere mphamvu yapamwamba komanso mphamvu zambiri zotulutsa.
Nthawi yotumiza: Jun-20-2023