Laser mpempe akwụkwọ akpọchiri akpọchi, ike dị elu laser ngwa ngwa

Ike dị elu nke femtosekọndlasernwere nnukwu uru n'inyocha sayensị na ngalaba ụlọ ọrụ mmepụta ihe dịka mmepụta terahertz, mmepụta attosecond pulse na comb optical frequency comb.Laser ndị a kpọchiri akpọchidabere na mgbasa ozi ọdịnala nke block-gain na-ejedebe site na mmetụta lensing okpomọkụ na ike dị elu, ugbu a ike mmepụta kachasị dị ihe dị ka 20 W.

Laser mpempe akwụkwọ dị gịrịgịrị na-eji usoro mgbapụta ọtụtụ-agafe iji gosipụtaọkụ mgbapụtaruo na mpempe akwụkwọ ahụ, ọ nwere ọkpụrụkpụ nke micron 100 maka nnabata mgbapụta dị elu. Ngwa uru dị oke mkpa yana teknụzụ azụ oyi na-ebelata mmetụta nke mmetụta lenzi okpomọkụ na mmetụta na-abụghị ahịrị, ma nwee ike nweta mmepụta pulse femtosecond ike dị elu.
Oscillator Wafer jikọtara ya na teknụzụ mkpọchi ụdị oghere Kerr bụ ụzọ bụ isi esi enweta mmepụta laser ike dị elu nkezi yana obosara pulse n'usoro nke femtosecond.

FIG. 1 (a) 72 eserese nhazi anya na (b) eserese anụ ahụ nke modulu mgbapụta

Otu ndị nchọpụta sitere na Chinese Academy of Sciences chepụtara ma wuo mpempe akwụkwọ laser nke nwere ụdị oghere Kerr nke dabere na modulu ọkpọkọ ụzọ 72 nke mepụtara onwe ya, ma mepụta mpempe akwụkwọ laser nke nwere ụdị oghere Kerr nke nwere ike kachasị elu na ike mkpali otu na China.
Dabere na ụkpụrụ nke mkpọchi ụdị lenzi Kerr na mgbakọ na mwepụ nke matrix ABCD, ndị otu nyocha buru ụzọ nyochaa ozizi mkpọchi ụdị nke laser mkpọchi ụdị lenzi Kerr dị gịrịgịrị, mee ka mgbanwe ụdị dị na resonator dị n'oge ọrụ mkpọchi ụdị na ọrụ na-aga n'ihu, ma kwado na radius ụdị oghere dị na diaphragm siri ike ga-ebelata ihe karịrị 7% mgbe mkpọchi ụdị dị.

Mgbe nke ahụ gasịrị, site n'ụkpụrụ nhazi ahụ, ndị otu nyocha ahụ chepụtara ma wuo resonator nke nwere ọnọdụ Kerr lens (FIG. 2) dabere na modulu mgbapụta ụzọ 72 (FIG.1) nke ndị otu ahụ mepụtara n'adabereghị onwe ha, wee nweta mmepụta laser pulsed nwere ike nkezi nke 11.78W, obosara pulse nke 245 fs na otu ike pulse nke 0.14μJ na oge mgbapụta 72 W. Obosara nke pulse mmepụta na mgbanwe nke ụdị intracavity kwekọrọ na nsonaazụ simulation ahụ.

FIG. 2. Ihe osise eserese nke oghere resonant nke lenzi Kerr nke ejiri Yb:YAG wafer laser nke ejiri mee nnwale ahụ.

Iji mee ka ike mmepụta nke laser dịkwuo mma, ndị otu nyocha ahụ mụbara radius nke enyo na-elekwasị anya, ma dozie ọkpụrụkpụ ọkara nke Kerr na mgbasa nke usoro nke abụọ. Mgbe etinyere ike mgbapụta ahụ na 94 W, ike mmepụta nkezi mụbara ruo 22.33 W, obosara pulse ahụ bụkwa 394 fs na ike pulse otu bụ 0.28 μJ.

Iji mee ka ike mmepụta dịkwuo elu, ndị otu nyocha ahụ ga-eme ka radius nke enyo concave lekwasịrị anya dịkwuo elu, ebe ha ga-etinye resonator ahụ n'ebe dị jụụ iji belata mmetụta nke nsogbu ikuku na mgbasa ikuku.