Upamhi hwePulse yePulsed Lasers

Upamhi hwepulse hunoreva nguva yepulse, uye huwandu hwacho hunowanzo bva pa nanoseconds (ns, 10).^-9masekondi) kusvika kufemtoseconds (fs, 10^-15Masekondi). Malaser anopusha ane upamhi hwakasiyana hwepulse akakodzera kushandiswa kwakasiyana-siyana:

- Upamhi hwePfupi hwePulse (Picosecond/Femtosecond):

Yakanakira kugadzira zvinhu zvisina kusimba nemazvo (semuenzaniso, girazi, safaya) kuderedza kutsemuka.

- Kureba kwePulse (Nanosecond): Yakakodzera kucheka simbi, kusanganisa, uye mamwe mashandisirwo apo panodiwa mhedzisiro yekupisa.

- Femtosecond Laser: Inoshandiswa mukuvhiyiwa kwemaziso (senge LASIK) nekuti inogona kucheka zvakanyatsonaka pasina kukuvara kwakanyanya kunyama dzakapoteredza.

- Mapuroteni mapfupi: Anoshandiswa kudzidza maitiro ekuchinja-chinja anokurumidza, akadai sekutenderera kwemamorekuru uye maitiro emakemikari.

Upamhi hwekurova kwemoyo hunokanganisa mashandiro elaser, senge simba repamusoro (P)._nhongonya= simba rekurova/upamhi hwekurova. Kana upamhi hwekurova hupfupi, simba repamusoro resimba rimwe chete rekurova rinowedzera.) Zvinokanganisawo mhedzisiro yekupisa: upamhi hwekurova hurefu, senge nanoseconds, zvinogona kukonzera kuunganidzwa kwekupisa muzvinhu, zvichikonzera kunyunguduka kana kukuvara kwekupisa; upamhi hwekurova hupfupi, senge picoseconds kana femtoseconds, zvinogonesa "kugadzirisa kutonhora" nenzvimbo dzakaderedzwa dzinokanganiswa nekupisa.

Fiber lasers inowanzo dzora uye kugadzirisa upamhi hwepulse uchishandisa nzira dzinotevera:

1. Q-Switching: Inogadzira mapuroteni e nanosecond nekuchinja nguva nenguva kurasikirwa kwe resonator kuti ibudise mapuroteni ane simba rakawanda.

2. Mode-Locking: Inogadzira picosecond kana femtosecond ultrashort pulses nekubatanidza longitudinal modes dziri mukati me resonator.

3. MaModulators kana Nonlinear Effects: Semuenzaniso, kushandisa Nonlinear Polarization Rotation (NPR) mumafibers kana saturable absorbers kudzvanya pulse width.