I-Pulse Width ye-Pulsed Lasers

Ububanzi be-Pulse busho ubude besikhathi sokushaya kwenhliziyo, futhi ububanzi ngokuvamile busuka kuma-nanosecond (ns, 10^-9imizuzwana) ukuya kuma-femtoseconds (fs, 10^-15imizuzwana). Ama-lasers ane-pulse anobubanzi obuhlukene be-pulse afanele ukusetshenziswa okuhlukahlukene:

- Ububanzi be-Pulse obufushane (Picosecond/Femtosecond):

Ilungele ukunemba kwemishini yezinto ezintekenteke (isb, ingilazi, isafire) ukunciphisa imifantu.

- Ububanzi be-Pulse Ebude (i-Nanosecond): Ifanele ukusika insimbi, ukushisela, nezinye izinhlelo zokusebenza lapho imiphumela eshisayo idingeka khona.

- I-Femtosecond Laser: Isetshenziswa ekuhlinzweni kwamehlo (okufana ne-LASIK) ngoba ingenza ukusikeka okunembile ngomonakalo omncane ezicutshini ezizungezile.

- I-Ultrashort Pulses: Isetshenziselwa ukutadisha izinqubo eziguquguqukayo ze-ultrafast, ezifana nokudlidliza kwamangqamuzana nokusabela kwamakhemikhali.

Ububanzi be-pulse buthinta ukusebenza kwe-laser, njengamandla aphezulu (P_isiqongo= amandla okushaya kwenhliziyo/ububanzi be-pulse. Ububanzi be-pulse bufushane, amandla aphezulu aphezulu wamandla afanayo we-pulse eyodwa.) Iphinde ibe nomthelela emiphumeleni yokushisa: ububanzi be-pulse ende, njengama-nanoseconds, bungabangela ukunqwabelana okushisayo ezintweni, okuholela ekuncibilikeni noma ekulimaleni okushisayo; ububanzi obufushane be-pulse, njengama-picoseconds noma ama-femtoseconds, buvumela "ukucubungula okubandayo" ngezindawo ezincishisiwe ezithinteke ukushisa.

Ama-laser we-fiber ngokuvamile alawula futhi alungise ububanzi be-pulse usebenzisa amasu alandelayo:

1. Q-Switching: Ikhiqiza ama-nanosecond pulses ngokushintsha ngezikhathi ezithile ukulahlekelwa kwe-resonator ukuze kukhiqizwe ama-pulses anamandla amakhulu.

2. Ukukhiya Imodi: Ikhiqiza i-picosecond noma i-femtosecond ultrashort pulses ngokuvumelanisa amamodi e-longitudinal ngaphakathi kwe-resonator.

3. Ama-modulators noma Imithelela Engaqondile: Isibonelo, ukusebenzisa i-Nonlinear Polarization Rotation (NPR) kumafayibha noma izibambisi ezigcwalayo ukuze ucindezele ububanzi be-pulse.