Niki laser ya ultrafast

A. Igitekerezo cya ultrafast laseri

Ultrafast laseri mubisanzwe yerekeza kumurongo ufunze laseri ikoreshwa mugusohora ultra-ngufi ya pulses, kurugero, pulses ya femtosekond cyangwa picosekond igihe.Izina ryukuri ryaba ultrashort pulse laser.Ultrashort pulse laseri hafi yuburyo bwafunze laseri, ariko inyungu zo guhinduranya zishobora no kubyara ultrashort pulses.

B. Ubwoko bwa laser ya ultrafast

1. Lazeri ya Ti-safiro, mubisanzwe Kerr lens moderi ifunze, irashobora gutanga impiswi ngufi nka 5 fs mugihe.Impuzandengo yabo isohora ingufu mubisanzwe ni miliwatt magana, hamwe nigipimo cyo gusubiramo impiswi za, twavuga, 80MHz hamwe na femtosekonds icumi cyangwa munsi yayo, hamwe nigihe impiswi zingana na femtosekond cyangwa icumi, bikavamo imbaraga zo hejuru cyane.Ariko lazeri ya titanium-safiro isaba kuvoma urumuri kuri lazeri yicyatsi kibisi, ibyo bigatuma bigorana kandi bihenze.

2. Hariho lazeri zitandukanye zipompa zashingiweho, kurugero, ytterbium-ikoporora (kristu cyangwa ikirahure) cyangwa chromium-ikoporora laser ya kristu, ubusanzwe ikoresha SESAM passiyo yuburyo bwo gufunga.Nubwo impiswi yamara ya diode-pompe ya lazeri ntabwo ari ngufi nkigihe impiswi yigihe cya titanium-safiro, lazeri yapompa irashobora gukwirakwira mugace kanini ukurikije igihe impiswi, igipimo cyisubiramo, nimbaraga zisanzwe (reba hano hepfo) .

3. Fibre ya fibre ishingiye kumirahuri yibirahuri hamwe nibintu bidasanzwe byisi birashobora no gufungwa muburyo bworoshye, urugero, ukoresheje polarisiyonike idafite umurongo cyangwa SESAM.Zifite aho zigarukira kuruta laseri nyinshi ukurikije imbaraga zisanzwe, cyane cyane imbaraga zo hejuru, ariko zirashobora guhuzwa byoroshye hamwe na fibre amplifier.Ingingo kuri moderi ifunze fibre laseri itanga ibisobanuro birambuye.

.Mubisanzwe, uburyo bwa disode ifunze diode ikora kumuvuduko mwinshi (ibihumbi byinshi megahertz) igipimo cyo gusubiramo imbaraga zingirakamaro.

Ultrafast laser oscillator irashobora kuba igice cya sisitemu ya ultrafast, ishobora no gushiramo imbaraga za ultrafast (nka fibre optique amplifier) ​​kugirango yongere imbaraga zimpanuka nimbaraga zisohoka.