Laser xaashi qaab quful ah, laysar tamar sare leh oo ultrafast ah

Awood sare femtose secondsleysarkaWaxay leedahay qiime weyn oo codsi ah cilmi baarista sayniska iyo warshadaha sida jiilka terahertz, jiilka garaaca garaaca attosecond iyo shanlada inta jeer ee indhaha.Laysarka mod-qufulanku salaysan dhaqameed block-gain warbaahinta waxaa xaddiday saamaynta lensing kulaylka ee awoodda sare, iyo hadda awoodda wax soo saarka ugu badan waa ilaa 20 W.

Leysarka xaashida khafiifka ah wuxuu isticmaalaa qaab dhismeedka bamka baska badan si uu u muujiyonalka bamkasi xaashida helaan dhexdhexaad ah oo dhumucdiisuna tahay 100 microns nuugista matoorka waxtarka sare leh. Dhexdhexaadka faa'iidada aadka u dhuuban ee lagu daray tignoolajiyada dib u qaboojinta waxay si weyn u yaraynaysaa saamaynta saamaynta lenska kulaylka iyo saamaynta aan tooska ahayn, waxayna gaadhi kartaa awood sare oo garaaca garaaca femtosecond.
Wafer oscillators oo ay weheliso teknoolajiyada qufulka lens-ka ee Kerr ayaa ah habka ugu muhiimsan ee lagu helo wax soo saarka leysarka celceliska sare oo leh balac garaaca garaaca sida isku xigxiga femtosecond.

FIG 1 (a) 72 jaantus qaab-dhismeedka indhaha iyo (b) jaantuska jireed ee moduleka bamka

Koox cilmi-baarayaal ah oo ka socda Akadeemiyada Sayniska ee Shiinaha ayaa naqshadeeyay oo ay dhiseen leysarka xaashida ee Kerr lens-ku xiran oo ku saleysan moduleka bamka ee 72-jidka ah ee iskood u horumariyay, waxayna soo saareen leysarka xaashida Kerr ee qaab-qufulan oo leh celceliska ugu sarreeya iyo tamarta garaaca wadnaha ee Shiinaha.
Iyada oo ku saleysan mabda'a Kerr lens mode-locking iyo xisaabinta soo noqnoqda ee matrix ABCD, kooxda cilmi-baarista ayaa marka hore falanqeeyay aragtida hab-qufulka ee saxanka khafiifka ah ee Kerr lens mode-locking laser, waxay la jaanqaadeen isbeddelka qaabka resonator-ka inta lagu jiro hawlgalka mode-qufulka iyo hawlgalka joogtada ah, waxayna xaqiijiyeen in habka daloolka ee diaphragm adag ka dib marka la xiro wax ka badan 7% la dhimi doono.

Ka dib, hagayay mabda'a naqshadeynta, kooxda cilmi-baaristu waxay naqshadeeyeen oo ay dhiseen resonator qaabka qufulka ah ee Kerr (FIG. 2) oo ku salaysan moduleka 72-jidka bamka (FIG.1) oo si madax-bannaan u horumariyay kooxda, oo helay wax soo saarka laser-gaab leh oo leh celcelis ahaan awoodda 11.78W, xajmiga garaaca wadnaha ee 245.1μfs ee tamarta WB waqti. Baaxadda garaaca garaaca wax soo saarka iyo kala duwanaanshaha habka intracavity ayaa si wanaagsan ula socda natiijooyinka jilitaanka.

FIG 2 jaantuska jaantuska godka resonant ee qaabka lenska Kerr-ku xidhan Yb:YAG wafer laser loo isticmaalay tijaabada

Si loo hagaajiyo awoodda wax-soo-saarka laysarka, kooxda cilmi-baadhistu waxay kordhisay wareegga qalooca ee muraayadda diiradda, waxayna si fiican u hagaajiyeen dhumucda dhexdhexaadka ah ee Kerr iyo kala firdhinta-dalabka labaad. Markii awoodda bamka la dhigay 94 W, celceliska awoodda wax soo saarku waxa la kordhiyey 22.33 W, ballaca garaaca wadnahana waxa uu ahaa 394fs halka tamarta garaaca hal garaacana ay ahayd 0.28 μJ.

Si loo sii kordhiyo awoodda wax soo saarka, kooxda cilmi-baaristu waxay sii kordhin doontaa radius-curvature ee lammaanaha muraayadda concave diirada saaraya, halka gelinaya resonator deegaan vacuum hoose oo xiran si loo yareeyo saamaynta qaska hawada iyo kala firdhiso hawada.