Kugunda Kukula kwa Pulsed Lasers

Kutalika kwa kugunda kumatanthawuza kutalika kwa kugunda kwa mtima, ndipo kuchuluka kwake kumachokera ku nanoseconds (ns, 10).^-9seconds) mpaka femtoseconds (fs, 10^-15masekondi). Ma lasers opukutidwa okhala ndi makulidwe osiyanasiyana a pulse ndi oyenera kugwiritsa ntchito zosiyanasiyana:

- Kutalika Kwakafupi Kwambiri (Picosecond/Femtosecond):

Ndi bwino kukonza mwatsatanetsatane zinthu zosalimba (monga galasi, safiro) kuti muchepetse ming'alu.

- Kutalika kwa Pulse Width (Nanosecond): Yoyenera kudula zitsulo, kuwotcherera, ndi ntchito zina zomwe zimafunikira kutentha.

- Laser ya Femtosecond: Imagwiritsidwa ntchito pochita maopaleshoni amaso (monga LASIK) chifukwa imatha kupanga mabala olondola ndikuwononga pang'ono minofu yozungulira.

- Ma ultrashort Pulses: Amagwiritsidwa ntchito pophunzira njira zamphamvu kwambiri, monga kugwedezeka kwa ma cell ndi machitidwe amankhwala.

Kuthamanga kwamphamvu kumakhudza magwiridwe antchito a laser, monga mphamvu yapamwamba (P_nsonga= mphamvu ya pulse / pulse width. Kufupikitsa kwa pulse m'lifupi, kumapangitsanso mphamvu yapamwamba ya mphamvu yofanana ya mphamvu imodzi.) Zimakhudzanso zotsatira za kutentha: kutalika kwa pulse, monga nanoseconds, kungayambitse kutentha kwa zinthu, zomwe zimayambitsa kusungunuka kapena kuwonongeka kwa kutentha; Kuthamanga kwafupipafupi, monga picoseconds kapena femtoseconds, kumathandiza "kuzizira" ndi madera omwe amakhudzidwa ndi kutentha.

Fiber lasers nthawi zambiri amawongolera ndikusintha kugunda kwamtima pogwiritsa ntchito njira izi:

1. Q-Switching: Amapanga ma nanosecond pulses mwa kusintha nthawi ndi nthawi zotayika za resonator kuti apange mphamvu zamphamvu kwambiri.

2. Kutseka kwa Mode: Kumapanga ma picosecond kapena femtosecond ultrashort pulses pogwirizanitsa mitundu yautali mkati mwa resonator.

3. Modulators kapena Nonlinear Effects: Mwachitsanzo, kugwiritsa ntchito Nonlinear Polarization Rotation (NPR) mu ulusi kapena saturable absorbers kuti mupanikizike kugunda kwa mtima.