Laser mpempe akwụkwọ ekpochi ọnọdụ, ike dị elu ultrafast laser

Ike dị elu femtosekọndlasernwere uru ngwa dị ukwuu na nyocha sayensị na mpaghara mmepụta ihe dị ka ọgbọ terahertz, ọgbọ pulse nke abụọ na mbo ngwa anya ugboro.Laser akpọchiri Moddabere na usoro mgbasa ozi mgbochi-erite ọdịnala na-ejedebe site na mmetụta lensing thermal na ike dị elu, ma ugbu a ike mmepụta kachasị bụ ihe dịka 20 W.

Mkpa mpempe akwụkwọ laser na-eji multi-pass mgbapụta Ọdịdị na-egosipụtaọkụ mgbapụtaka mpempe akwụkwọ nweta ọkara na ọkpụrụkpụ nke 100 microns maka elu arụmọrụ mgbapụta absorption. The kemkpa mkpa uru ọkara jikọtara na backcooling technology na-ebelata mmetụta nke thermal lens mmetụta na-abụghị online, na ike nweta elu femtosecond pulse mmepụta.
Wafer oscillators jikọtara na Kerr lens mode-technical mode-locking technology bụ ụzọ isi nweta mmepụta laser ike dị elu yana obosara usu n'usoro nke femtosecond.

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

Otu ndị na-eme nchọpụta si na Chinese Academy of Sciences haziri na wuru a Kerr oghere mode-ekpochi mpempe akwụkwọ laser dabere na onwe-mepụtara 72-ụzọ mgbapụta modul, na mepụtara a Kerr oghere mode-ekpochi mpempe akwụkwọ laser na kasị elu nkezi ike na otu usu ume na China.
Dabere na ụkpụrụ nke Kerr lens mode-locking na iterative ngụkọta nke ABCD matrix, ndị nnyocha otu mbụ nyochaa mode-mkpọchi tiori nke mkpa efere Kerr lens mode-kpọchi laser, simulated mode mgbanwe na resonator n'oge mode-mkpọchi ọrụ na-aga n'ihu na-arụ ọrụ, na kwenye na cavity mode radius na ike diaphragm site na-mkpọchi karịa 7% ga-ebelata.

E mesịa, na-eduzi ụkpụrụ imewe, ndị nnyocha otu haziri na wuru a Kerr oghere mode-ekpochi resonator (FIG. 2) dabeere na 72-ụzọ mgbapụta modul (FIG.1) onwe mepụtara site otu, na nwetara a pulsed laser mmepụta na nkezi ike nke 11.78W, a usu obosara nke 245.75fs ike na otu pulse ike na otu 245.7 μJ mgbapụta. oge. Obosara nke mpụta mmepụta na mgbanwe nke ọnọdụ intracavity dị na nkwekọrịta dị mma na nsonaazụ simulation.

FIG. 2 Eserese nke oghere resonant nke ọnọdụ oghere Kerr akpọchiri Yb: YAG wafer laser ejiri mee nnwale ahụ.

Iji meziwanye ike mmepụta nke laser, ndị ọrụ nyocha mụbara okirikiri curvature nke enyo na-elekwasị anya, wee dezie oke nke Kerr na mgbasa nke abụọ. Mgbe a na-etinye ike mgbapụta na 94 W, nkezi mmepụta ike na-abawanye ruo 22.33 W, na obosara usu bụ 394 fs na otu ume ume bụ 0.28 μJ.

Iji n'ihu dịkwuo mmepụta ike, nnyocha otu ga-ọzọ dịkwuo curvature radius nke lekwasịrị anya concave mirror ụzọ, mgbe ịtụkwasị resonator na a ala agụụ mechiri emechi gburugburu iji belata mmetụta nke ikuku ọgba aghara na ikuku mgbasa.