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 badnaan 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 dhisay Leys-ka Kerr lens-qaab-quful leyser oo ku salaysan moduleka bamka ee 72-jidka ah ee iskood u horumaray, waxayna soo saareen leeser xaashi quful ah oo Kerr ah oo leh celceliska awoodda ugu sarreysa iyo hal keliya. tamarta garaaca wadnaha ee Shiinaha.
Iyada oo ku saleysan mabda'a qufulka lenska Kerr iyo xisaabinta soo noqnoqota ee matrix ABCD, kooxda cilmi-baarista ayaa marka hore falanqeeyay aragtida qaab-qufulka ee saxanka khafiifka ah ee Kerr lens mode-locking laser, waxay la jaanqaadeen isbeddelka qaabka resonator-ka inta lagu jiro hawlgalka qaab-xirfadeedka iyo hawlgalka joogtada ah, oo la xaqiijiyay in radius habka dalool ee diaphragm adag la dhimi doono in ka badan 7% ka dib habka-qufulka.

Ka dib, hagayo mabda'a naqshadeynta, kooxda cilmi-baaristu waxay naqshadeeyeen oo ay dhiseen resonator Lens Kerr mode-locked resonator (FIG. 2) oo ku salaysan habka 72-jidka bamka (FIG.1) oo si madax-bannaan u soo saaray kooxda, oo helay laser garaaca wadnaha. wax soo saar leh celcelis ahaan 11.78W, ballac garaaca garaaca 245fs iyo hal tamar garaacis ah oo ah 0.14μJ wakhtiga bamgaraynta 72W. 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.