A. Fikradda laser ultrafast
Laysarada ultrafast waxay inta badan tixraacaan leysarka qaab-xiran ee loo isticmaalo in lagu sii daayo garaaca garaaca gaaban ee aadka u gaaban, tusaale ahaan, garaaca garaaca femtosecond ama picosecond. Magaca saxda ah wuxuu noqon lahaa ultrashort pulse laser. Laysarada garaaca wadnaha ee Ultrashort waxay ku dhawaad yihiin leysarka qaab-xidhan, laakiin saamaynta beddelashada faa'iidada waxay sidoo kale soo saari kartaa garaaca wadnaha ultrashort.
B. Nooca laser ultrafast
1. Ti-sapphire lasers, sida caadiga ah Kerr lens mode-locked, waxay soo saari karaan garaacyo gaaban ilaa 5 fs muddada. Celcelis ahaan awooddooda wax soo saarku waa dhawr boqol oo milliwatts, oo leh celceliska garaaca garaaca garaaca, dheh, 80MHz iyo tobanaan femtose seconds ama ka yar, iyo muddada garaaca garaaca tobanaan ilbiriqsi ama ka yar, taasoo keentay awood aad u sareysa. Laakin laysarka titanium-sapphire waxay u baahan yihiin in laga soo saaro laydhka laydhka cagaaran qaarkood, taas oo ka dhigaysa kuwo aad u adag oo qaali ah.
2. Waxaa jira lasers diode-pumped kala duwan oo ku salaysan, tusaale ahaan, ytterbium-doped (crystal ama galaas) ama chromium-doped laser crystals, kuwaas oo inta badan isticmaala SESAM passive mode-locking. Inkasta oo muddada garaaca wadnaha ee leysarka diode-pumped ayan ahayn mid gaaban sida muddada garaaca wadnaha ee lasers titanium-sapphire, laysarka diode-pumped waxay dabooli karaan gobol cabbir ballaaran marka loo eego muddada garaaca wadnaha, heerka celceliska garaaca wadnaha, iyo celceliska awoodda (eeg hoos) .
3. Fiber lasers oo ku salaysan fiilooyinka dhalada ah ee lagu dabay walxo dhul dhif ah ayaa sidoo kale laga yaabaa inay qaab qufulan yihiin, tusaale ahaan, iyadoo la isticmaalayo wareegtada polarization ee aan tooska ahayn ama SESAM. Waxay aad uga xaddidan yihiin leysarka bulk marka loo eego awoodda celceliska, gaar ahaan awoodda ugu sarreysa, laakiin si habboon ayaa loogu dari karaa amplifiers fiber. Maqaalka ku saabsan laser-fiber-locked mode-locked lasers wuxuu bixiyaa faahfaahin dheeraad ah.
(4) Layserrada diode-ku-xidhan waxay noqon karaan qalab isku dhafan ama laysarrada godka dibadda ah, oo waxay noqon karaan kuwo firfircoon, habaysan ama hab isku dhafan oo quful. Caadi ahaan, laysarrada diode-ku xidhan ee qaabaysan waxay ku shaqeeyaan xawaare sare (dhowr kun oo megahertz) garaaca garaaca wadnaha oo ah tamar dhexdhexaad ah.
Ultrafast laser oscillators waxay noqon kartaa qayb ka mid ah nidaamyada ultrafast laser, kaas oo sidoo kale ku jiri kara cod-weyneeye ultrafast (sida fibre optic amplifier) si loo kordhiyo awoodda ugu sarreysa iyo celceliska wax soo saarka.
Waqtiga boostada: Juun-20-2023