Pulse Width yePulsed Lasers

Pulse wide inoreva kureba kwekupuruzira, uye huwandu hunowanzo tambanudzira kubva nanoseconds (ns, 10).^-9masekondi) kusvika kufemtoseconds (fs, 10^-15masekondi). Pulsed lasers ane akasiyana pulse wides akakodzera kune akasiyana maapplication:

- Pfupi Pulse Width (Picosecond/Femtosecond):

Yakanakira machining chaiwo emidziyo isina kusimba (semuenzaniso, girazi, safire) kuderedza kutsemuka.

- Yakareba Pulse Width (Nanosecond): Inokodzera kucheka simbi, welding, uye mamwe maapplication panodiwa mhedzisiro yekupisa.

- Femtosecond Laser: Inoshandiswa mukuvhiyiwa kwemaziso (senge LASIK) nekuti inogona kuita machekwa chaiwo nekukuvadza kushoma kune tishu dzakatenderedza.

- Ultrashort Pulses: Inoshandiswa kudzidza ultrafast dynamic process, senge molecular vibrations uye kemikari kuita.

Iyo pulse hupamhi inokanganisa mashandiro e laser, senge peak simba (P_peak= pulse energy/pulse width. Iyo yakapfupika iyo pulse hupamhi, iyo yakakwirira simba repamusoro kune imwechete-pulse simba.) Inokanganisawo mhedzisiro yekupisa: yakareba pulse widths, senanoseconds, inogona kukonzera kupisa kuunganidza muzvinhu, zvichiita kuti kunyunguduke kana kukuvadza kwekushisa; pfupi pulse wides, senge picoseconds kana femtoseconds, inogonesa "kutonhora kugadzirisa" nenzvimbo dzakadzikiswa dzinopisa.

Fiber lasers anowanzo kudzora uye kugadzirisa pulse hupamhi uchishandisa anotevera maitiro:

1. Q-Switching: Inogadzira nanosecond pulses nguva nenguva kuchinja resonator kurasikirwa kuti ibudise-high-energy pulses.

2. Mode-Locking: Inogadzira picosecond kana femtosecond ultrashort pulses kuburikidza ne synchronizing longitudinal modes mukati resonator.

3. Modulators kana Nonlinear Effects: Semuenzaniso, kushandisa Nonlinear Polarization Rotation (NPR) mumafibers kana saturable absorbers kuti inomesa hupamhi hwepulse.