A. Fikradda laysarka aadka u dheereeya
Laysarka aadka u degdega badan badanaa waxaa loola jeedaa laysarka qaabka xiran ee loo isticmaalo in lagu soo saaro garaaca aadka u gaaban, tusaale ahaan, garaaca femtosecond ama picosecond duration. Magac sax ah ayaa noqon doona laysarka garaaca aadka u gaaban. Laysarka garaaca aadka u gaaban waa laysarka qaabka xiran, laakiin saameynta badalka faa'iidada waxay sidoo kale soo saari kartaa garaaca aadka u gaaban.
B. Nooca laysarka aadka u dheereeya
1. Laser-yada Ti-sapphire, oo badanaa ku xiran qaabka muraayadda Kerr, waxay soo saari karaan garaacyo gaaban ilaa 5 fs muddada. Celcelis ahaan awooddooda wax soo saarku waa dhowr boqol oo milliwatts, iyadoo heerarka ku celcelinta garaaca ay yihiin, tusaale ahaan, 80MHz iyo tobanaan femtoseconds ama ka yar, iyo muddada garaaca oo ah tobanaan femtoseconds ama ka yar, taasoo keenta awood aad u sarreysa. Laakiin laser-yada titanium-sapphire waxay u baahan yihiin iftiin ka soo baxa laser-yada iftiinka cagaaran qaarkood, taasoo ka dhigaysa kuwo aad u adag oo qaali ah.
2. Waxaa jira laysarro kala duwan oo diode-pumped ah oo ku salaysan, tusaale ahaan, ytterbium-doped (crystal ama galaas) ama chromium-doped laser crystal, kuwaas oo badanaa isticmaala habka-xiritaanka SESAM passive mode. In kasta oo muddada garaaca ee laysarka diode-pumped uusan ahayn mid gaaban sida muddada garaaca ee laysarka titanium-sapphire, laysarka diode-pumped waxay dabooli karaan gobol cabbir ballaaran marka loo eego muddada garaaca, heerka ku celcelinta garaaca, iyo awoodda celceliska (fiiri hoos).
3. Liisar-ka fiber-ka ee ku salaysan fiilooyinka galaaska ee lagu dahaadhay walxaha dhulka naadirka ah ayaa sidoo kale laga yaabaa in si aan toos ahayn loogu xiro qaabka, tusaale ahaan, iyadoo la adeegsanayo wareegga polarization-ka aan tooska ahayn ama SESAM. Way ka xaddidan yihiin laysarka bulk marka loo eego awoodda celceliska, gaar ahaan awoodda ugu sarreysa, laakiin si habboon ayaa loogu dari karaa amplifiers-ka fiber-ka. Maqaalka ku saabsan laysarka fiber-ka ee qaabka xiran wuxuu bixinayaa faahfaahin dheeraad ah.
(4) laysarka diode-ka ee qaabka xiran wuxuu noqon karaa aalado isku dhafan ama laysarka diode-ka ee godadka dibadda, wuxuuna noqon karaa mid firfircoon, aan firfircoonayn ama isku dhafan. Caadiyan, laysarka diode-ka ee qaabka xiran wuxuu ku shaqeeyaa heer ku celcelin garaac sare (dhowr kun oo megahertz) oo leh tamar garaac dhexdhexaad ah.
Oscillators-ka laser-ka ee aadka u degdega badan waxay qayb ka noqon karaan nidaamyada laser-ka ee aadka u degdega badan, kuwaas oo sidoo kale ku jiri kara cod-weyneeye aad u degdega badan (sida cod-weyneeye fiber optic ah) si loo kordhiyo awoodda ugu sarreysa iyo awoodda wax soo saarka celceliska.
Waqtiga boostada: Juun-20-2023