A. Lingaliro la ma laser othamanga kwambiri
Ma laser othamanga kwambiri nthawi zambiri amatanthauza ma laser otsekedwa ndi mode omwe amagwiritsidwa ntchito kutulutsa ma pulse afupi kwambiri, mwachitsanzo, ma pulse a femtosecond kapena picosecond duration. Dzina lolondola kwambiri lingakhale ultrashort pulse laser. Ma laser otsekedwa ndi ma pulse afupi kwambiri ndi pafupifupi ma laser otsekedwa ndi mode, koma zotsatira za gain switching zimathanso kupanga ma pulse afupi kwambiri.
B. Mtundu wa laser yothamanga kwambiri
1. Ma laser a Ti-sapphire, omwe nthawi zambiri amakhala ndi Kerr lens mode-locked, amatha kupanga ma pulse afupiafupi ngati 5 fs mu nthawi. Mphamvu yawo yotulutsa nthawi zambiri imakhala ma milliwatts mazana angapo, ndi ma pulse repetition rate a, mwachitsanzo, 80MHz ndi makumi a femtoseconds kapena kuchepera, komanso ma pulse duration a makumi a femtoseconds kapena kuchepera, zomwe zimapangitsa kuti pakhale mphamvu yayikulu kwambiri. Koma ma laser a titanium-sapphire amafuna kupopera kuwala kuchokera ku ma laser ena obiriwira, zomwe zimapangitsa kuti akhale ovuta komanso okwera mtengo.
2. Pali ma laser osiyanasiyana opompedwa ndi diode kutengera, mwachitsanzo, makristalo a laser opompedwa ndi ytterbium (kristalo kapena galasi) kapena chromium-doped laser, omwe nthawi zambiri amagwiritsa ntchito SESAM passive mode-locking. Ngakhale kuti nthawi ya pulse ya ma laser opompedwa ndi diode siifupi ngati nthawi ya pulse ya ma laser a titanium-saphire, ma laser opompedwa ndi diode amatha kuphimba dera lalikulu la magawo malinga ndi nthawi ya pulse, pulse repetition rate, ndi avareji ya mphamvu (onani pansipa).
3. Ma laser a fiber opangidwa ndi ulusi wagalasi wokhala ndi zinthu zosadziwika bwino zapadziko lapansi amathanso kutsekedwa mozungulira, mwachitsanzo, pogwiritsa ntchito nonlinear polarization rotation kapena SESAM. Ndi ochepa kuposa ma laser ambiri pankhani ya mphamvu yapakati, makamaka mphamvu yayikulu, koma amatha kuphatikizidwa mosavuta ndi ma fiber amplifiers. Nkhani yokhudza ma laser a fiber otsekedwa mozungulira ikupereka tsatanetsatane wambiri.
(4) ma laser a diode otsekedwa ndi mode-locked akhoza kukhala zipangizo zofunika kapena ma laser a diode akunja, ndipo akhoza kukhala ogwira ntchito, osagwira ntchito kapena osakanikirana ndi mode-locked. Kawirikawiri, ma laser a diode otsekedwa ndi mode-locked amagwira ntchito pamlingo wapamwamba (ma megahertz zikwi zingapo) wobwerezabwereza pa mphamvu yapakati ya pulse.
Ma oscillator a laser othamanga kwambiri akhoza kukhala gawo la machitidwe a laser othamanga kwambiri, omwe angaphatikizeponso amplifier yothamanga kwambiri (monga amplifier ya fiber optic) kuti awonjezere mphamvu yayikulu komanso mphamvu yotulutsa yapakati.
Nthawi yotumizira: Juni-20-2023