A. Echiche nke ultrafast lasers
Laser Ultrafast na-ezokarị aka na lasers akpọchiri ọnọdụ ejiri na-ebupụta ultra-short pulses, dịka ọmụmaatụ, pulses nke femtosecond ma ọ bụ oge picosecond.Aha ziri ezi ga-abụ laser pulse ultrashort.Ultrashort pulse lasers fọrọ nke nta ka ọ bụrụ lasers akpọchiri akpọchi, mana uru ngbanwe mmetụta nwekwara ike mepụta ultrashort pulses.
B. Ụdị nke ultrafast laser
1. Ti-sapphire lasers, na-emekarị Kerr lens mode-ekpochi, nwere ike ịmepụta pulses dị mkpụmkpụ dị ka 5 fs na oge.Nkezi ike nrụpụta ha na-abụkarị narị milliwatts narị ole na ole, yana ọnụego nkwughachi nke, sịnụ, 80MHz na iri puku femtoseconds ma ọ bụ ihe na-erughị ya, yana oge pulse nke iri iri nke femtoseconds ma ọ bụ obere, na-ebute ike kacha elu.Ma titanium-sapphire lasers chọrọ ịgbapụta ọkụ site na ụfọdụ lasers-acha akwụkwọ ndụ akwụkwọ ndụ, nke na-eme ka ha dịkwuo mgbagwoju anya ma dị oke ọnụ.
2. E nwere dị iche iche diode-pumped lasers dabeere, ọmụmaatụ, ytterbium-doped (crystal ma ọ bụ iko) ma ọ bụ chromium-doped laser kristal, nke na-ejikarị SESAM passive mode-kpọchi.Ọ bụ ezie na oge pulse nke diode-pumped lasers adịghị mkpụmkpụ dị ka oge pulse nke titanium-sapphire lasers, diode-pumped lasers nwere ike kpuchie mpaghara paramita obosara n'ihe gbasara oge pulse, ọnụọgụ ugboro ugboro, na nkezi ike (lee n'okpuru). .
3. Fiber lasers dabere na enyo emep uko emep uta eri doped na obere ụwa ọcha nwekwara ike ịbụ ihe na-agafe agafe mode-ekpochi, ọmụmaatụ, na-eji nononlinear polarization ntụgharị ma ọ bụ SESAM.Ha nwere oke karịa lasers buru ibu n'ihe gbasara ike nkezi, ọkachasị ike kacha elu, mana enwere ike ijikọ ya na ngwa ngwa fiber.Isiokwu na mode-ekpochi eriri lasers na-enye nkọwa ndị ọzọ.
(4) Laser diode kpọchiri akpọchi nwere ike ịbụ ngwaọrụ dị mkpa ma ọ bụ oghere diode lasers, ma nwee ike na-arụ ọrụ, na-agafe agafe ma ọ bụ ọnọdụ agwakọtara.Dịka, lasers diode ekpochi mode na-arụ ọrụ n'ogo dị elu (ọtụtụ puku megahertz) ugboro ugboro na ume usu na-agafeghị oke.
Ultrafast laser oscillators nwere ike ịbụ akụkụ nke sistemu laser ultrafast, nke nwekwara ike ịgụnye ampilifaya ultrafast (dị ka eriri optic amplifier) iji mee ka ike dị elu na nkezi mmepụta ike.
Oge nzipu: Jun-20-2023