A. Ma'anar laser ultrafast
Laser ultrafast yawanci yana nufin na'urorin kulle-kulle da ake amfani da su don fitar da gajerun bugun jini, misali, bugun femtosecond ko tsawon lokaci na picosecond. Sunan da ya fi dacewa zai zama Laser pulse ultrashort. Ultrashort pulse Laser kusan kusan nau'i-nau'i-kulle lasers ne, amma tasirin canza yanayin yana iya haifar da bugun jini na ultrashort.
B. Nau'in ultrafast Laser
1. Ti-sapphire Laser, yawanci Kerr ruwan tabarau yanayin-kulle, iya samar da bugun jini a takaice kamar 5 fs a cikin duration. Matsakaicin ikon fitar da su yawanci 'yan milliwatts ɗari ne, tare da ƙimar maimaita bugun bugun jini na, a ce, 80MHz da dubun femtoseconds ko ƙasa da haka, da lokacin bugun jini na dubun-tsakini na femtoseconds ko ƙasa da haka, yana haifar da babban ƙarfin kololuwa. Amma Laser na titanium-sapphire yana buƙatar yin famfo haske daga wasu na'urori masu launin kore, wanda ke sa su zama masu rikitarwa da tsada.
2. Akwai nau'ikan laser diode-pumped daban-daban dangane da, alal misali, ytterbium-doped (crystal ko gilashi) ko lu'ulu'u na chromium-doped laser, wanda yawanci ke amfani da SESAM passive mode-locking. Kodayake tsawon lokacin bugun jini na laser diode-pumped lasers bai kai ɗan gajeren lokaci ba kamar tsawon lokacin pulse na laser titanium-sapphire, laser-pumped lasers na iya rufe yanki mai fa'ida dangane da tsawon lokacin bugun jini, ƙimar maimaita bugun jini, da matsakaicin ƙarfi (duba ƙasa) .
3. Fiber Laser dangane da filayen gilashin da aka yi tare da abubuwan da ba kasafai ake samun su ba na iya zama kulle-kulle, alal misali, ta amfani da jujjuyawar polarization marasa kan layi ko SESAM. Sun fi iyakancewa fiye da manyan lasers dangane da matsakaicin ƙarfi, musamman maɗaukakin ƙarfi, amma ana iya haɗa su cikin dacewa tare da amplifiers fiber. Labarin a kan yanayin kulle laser laser yana ba da ƙarin cikakkun bayanai.
(4) Yanayin kulle-kulle diode Laser na iya zama na'urori masu haɗaka ko laser diode cavity na waje, kuma suna iya zama mai aiki, kulle-kulle ko gauraye yanayin. Yawanci, na'urorin diode masu kulle-kulle suna aiki a matsakaicin matsakaicin kuzarin bugun jini (megahertz dubu da yawa).
Ultrafast Laser oscillators na iya zama wani ɓangare na ultrafast Laser tsarin, wanda kuma zai iya haɗa da ultrafast amplifier (kamar fiber optic amplifier) don ƙara ƙarfin kololuwa da matsakaicin ƙarfin fitarwa.
Lokacin aikawa: Juni-20-2023