Txheej txheem cej luam ntawm pulsed lasers

Txheej txheem cej luam ntawmpulsed lasers

Txoj kev ncaj tshaj plaws los tsimlaserCov pulses yog kom ntxiv tus modulator mus rau sab nraud ntawm cov laser txuas ntxiv. Cov qauv no tuaj yeem tsim cov picosecond kev ceev, txawm hais tias yooj yim, tab sis nkim lub teeb zog thiab peak tsis dhau lub zog txuas ntxiv. Yog li ntawd, ib txoj hauv kev ntau dua los tsim cov txheej txheem laser yog los hloov kho nyob rau hauv lub laser kab noj hniav, khaws cia lub zog ntawm lub sijhawm tsheb ciav hlau thiab tso nws rau sijhawm. Plaub lub tswv yim siv los tsim cov pulses los ntawm Laser Cegonity tau nce hloov, q-hloov (ploj mus hloov), kab noj hniav nchuav, thiab hom-ntsuas phoo.

Qhov nce hloov tsim tsim kom muaj cov pulses luv los ntawm kev hloov lub zog tso kua mis. Piv txwv li, semiconductor nce-hloov lasers tuaj yeem tsim cov pulses los ntawm ob peb nanoseconds mus ib puas picoseconds los ntawm kev hloov kho tam sim no. Txawm hais tias lub zog mem tes yog tsawg, hom no yog hloov tau heev, xws li muab kev rov ua dua tshiab thiab mem tes dav. Nyob rau hauv 2018, cov kws tshawb nrhiav ntawm University of Tokyo tau tshaj tawm txog femtosecond nce-hloov semiconductor laser, sawv cev rau kev sib tsoo hauv 40-xyoo tech tilkeneck.

Muaj zog nanosecond pulses feem ntau yog tsim los ntawm Q-Switched lasers, thiab cov mem tes muaj nyob rau hauv ntau pab pawg ntawm ob peb milliJoules rau ntau cov Joules, nyob ntawm qhov loj me ntawm cov kab ke. Nruab Nrab Zog (feem ntau hauv qab 1 μuj) picosecond pulses yog feem ntau yog tsim los ntawm hom-xauv lasers. Muaj ib lossis ntau qhov Ultrashort Pulses hauv cov Laser Resonator uas voj voog tsis tu ncua. Txhua lub intracavity cov mem tes hloov ib lub mem tes los ntawm cov zis txuas txuas daim iav, thiab lub recharical feem ntau ntawm 10 mHz thiab 100 GHz. Daim duab hauv qab no qhia cov kev rho tawm tag nrho (thiabi) dissipative soliton femtosecondFiber Ntau Laser Ntaus, feem ntau feem ntau ntawm cov uas tuaj yeem siv cov qauv therlabs (fiber ntau, lens, lub vaj thiab cov khoom siv).

CAREATION nchuav txheej txheem tuaj yeem siv rauQ-Switched LasersTxhawm rau kom tau txais luv luv pulses thiab hom-xauv lasers kom nce mem tes lub zog nrog qis dua.

Lub sij hawm sau thiab zaus sau pulses
Cov duab linear ntawm cov mem tes nrog lub sijhawm feem ntau kuj yooj yim thiab tuaj yeem qhia los ntawm Gaussian thiab Sech² Frequours. Mem tes lub sij hawm (tseem hu ua Mem tes dav) yog feem ntau qhia los ntawm ib nrab-qhov dav dav (fwham) tus nqi kho qhov muag yog tsawg kawg yog ib nrab ncov lub zog; Q-Hloov Laser tsim nanosecond luv pulses los ntawm
Hom-cov lasers ua rau ultra-luv pulses (USP) nyob rau hauv kev txiav txim ntawm kaum ntawm picoseconds rau femtoseconds. Kev nrawm nrawm hluav taws xob tsuas yog ntsuas tau txog kaum tawm ntawm picoseconds, thiab cov pulsized luv dua nrog cov tshuaj kho kho kho kho tshiab, qav thiab kab laug sab. Thaum Nanosecond lossis ntev dua pulse hloov lawv cov mem tes dav thaum lawv mus ncig, txawm tias ntev dhau mus, ultra-luv pulses tuaj yeem cuam tshuam los ntawm ntau yam:

Kev tawg tuaj yeem ua rau muaj cov mem tes loj heev, tab sis tuaj yeem hloov kho nrog cov dispersion. Daim duab txheej txheem hauv qab no qhia tau tias yuav ua li cas lub thorlabs femtosecond pulse compressor them nyiaj rau lub tsom iav dispersion.

Nonlinearity generally does not directly affect the pulse width, but it widens the bandwidth, making the pulse more susceptible to dispersion during propagation. Txhua hom fiber ntau, suav nrog lwm cov peev txheej nrog txwv bandwidth, tuaj yeem cuam tshuam cov duab ntawm cov mem tes los yog thiab ib qho txo ​​qis hauv qhov chaw nyob hauv lub sijhawm; Tseem muaj cov xwm txheej dav ntawm qhov twg lub chirped chired mem tes ua luv thaum lub spectrum ua nqaim.