Pulse Width ea Pulsed Lasers

Pulse width e bolela nako ea ho otla ha pelo, 'me hangata mefuta e fapaneng e tloha ho nanoseconds (ns, 10).^-9metsotsoana) ho ea ho femtoseconds (fs, 10^-15metsotsoana). Li-laser tsa pulse tse nang le bophara bo fapaneng ba pulse li loketse lits'ebetso tse fapaneng:

- Bophara bo Khutšoane ba Pulse (Picosecond/Femtosecond):

E loketse bakeng sa ho sebetsa ka mokhoa o nepahetseng oa lisebelisoa tse senyehang habonolo (mohlala, khalase, safire) ho fokotsa mapetsong.

- Long Pulse Width (Nanosecond): E loketse ho seha tšepe, welding, le lisebelisoa tse ling moo ho hlokahalang liphello tsa mocheso.

- Laser ea Femtosecond: E sebelisoa ho buoang mahlo (joalo ka LASIK) hobane e ka etsa maqeba a nepahetseng ka tšenyo e nyane ho lisele tse haufi.

- Ultrashort Pulses: E sebelisetsoa ho ithuta lits'ebetso tse matla ka ho fetesisa, joalo ka ho thothomela ha limolek'hule le karabelo ea lik'hemik'hale.

Bophara ba pulse bo ama ts'ebetso ea laser, joalo ka matla a holimo (P_tlhoro= matla a ho otla ha pelo / bophara ba sekhahla. Ha e le khuts'oane bophara ba pulse, e phahamisa matla a tlhōrō bakeng sa matla a tšoanang a pulse e le 'ngoe.) E boetse e susumetsa liphello tsa mocheso: bolelele ba nako e telele, joaloka li-nanoseconds, li ka baka ho bokellana ha mocheso ka thepa, ho lebisang ho qhibiliha kapa ho senyeha ha mocheso; maqhubu a makhutšoane, joalo ka li-picoseconds kapa li-femtoseconds, a nolofalletsa "ts'ebetso e batang" ka libaka tse fokotsehileng tse amehang ke mocheso.

Li-laser tsa fiber hangata li laola le ho fetola bophara ba pulse li sebelisa mekhoa e latelang:

1. Q-Switching: E ​​hlahisa li-pulse tsa nanosecond ka ho fetola nako le nako tahlehelo ea resonator ho hlahisa li-pulse tse matla haholo.

2. Mokhoa-Locking: E ​​hlahisa picosecond kapa femtosecond ultrashort pulses ka ho hokahanya mekhoa ea longitudinal ka hare ho resonator.

3. Li-Modulators kapa Liphello Tse sa Lekanyetsoang: Ka mohlala, ho sebelisa Nonlinear Polarization Rotation (NPR) ka likhoele kapa li-absorber tse saturable ho hatella bophara ba pulse.