A. ʻO ka manaʻo o nā lasers ultrafast
Hoʻohana pinepine ʻia nā lasers ultrafast i nā lasers paʻa i ka mode-locked i hoʻohana ʻia e hoʻokuʻu i nā pulses ultra-pōkole, no ka laʻana, nā pulses o femtosecond a i ʻole picosecond ka lōʻihi.ʻO kahi inoa pololei ʻoi aku ka ultrashort pulse laser.ʻO nā lasers pulse ultrashort aneane hiki ke hoʻopaʻa ʻia i ka mode-locked lasers, akā hiki i ka hopena hoʻololi loaʻa ke hana pū i nā pulse ultrashort.
B. ʻO ke ʻano o ka laser ultrafast
1. Hiki i nā lasers Ti-sapphire, maʻamau ʻo Kerr lens mode-locked, hiki ke hana i nā puʻupuʻu pōkole e like me 5 fs i ka lōʻihi.ʻO kā lākou mana hoʻopuka maʻamau he mau haneli milliwatts, me nā helu hoʻopiʻi pulse o, e ʻōlelo, 80MHz a me ʻumi mau femtoseconds a i ʻole, a me nā lōʻihi o ka pulse he ʻumi o nā femtoseconds a i ʻole ka liʻiliʻi, e hopena i kahi mana kiʻekiʻe loa.Akā ʻo nā lasers titanium-sapphire e koi aku i ka hoʻomoʻi ʻana i ke kukui mai kekahi mau lasers kukui ʻōmaʻomaʻo, ʻoi aku ka paʻakikī a me ke kumukūʻai.
2. Aia nā lasers diode-pumped like ʻole ma muli o, no ka laʻana, ytterbium-doped (crystal a aniani paha) a i ʻole chromium-doped laser crystals, e hoʻohana mau ana i ka SESAM passive mode-locking.ʻOiai ʻaʻole pōkole ka lōʻihi o ka pulse o nā lasers diode-pumped e like me ka lōʻihi o ka pulse o nā lasers titanium-sapphire, hiki i nā lasers diode-pumped ke uhi i kahi ʻāpana ākea ākea e pili ana i ka lōʻihi o ka pulse, ka helu hoʻi o ka pulse, a me ka mana maʻamau (e ʻike i lalo) .
3. Hiki ke hoʻopaʻa paʻa ʻia nā laser fiber e pili ana i nā pulu aniani i hoʻopaʻa ʻia me nā mea ʻeleʻele koʻikoʻi, no ka laʻana, me ka hoʻohana ʻana i ka rotation polarization nonlinear a i ʻole SESAM.ʻOi aku ka palena o lākou ma mua o nā lasers nui ma ke ʻano o ka mana maʻamau, ʻoi aku ka mana kiʻekiʻe, akā hiki ke hoʻohui ʻia me nā mea hoʻonui fiber.ʻO ka ʻatikala e pili ana i nā laser fiber laka paʻa ʻia e hāʻawi i nā kikoʻī hou aku.
(4) Hiki i nā laser diode paʻa ke ʻano he mau mea hoʻohui a i ʻole nā laser diode lua waho, a hiki ke hoʻoikaika, passive a hui pū ʻia.ʻO ka maʻamau, hana nā laser diode paʻa i ke ʻano ma kahi kiʻekiʻe (he mau tausani megahertz) pulse repetition rate ma ka ikehu pulse haʻahaʻa.
Hiki i nā oscillators laser ultrafast ke lilo i ʻāpana o nā ʻōnaehana laser ultrafast, hiki ke hoʻokomo pū i kahi amplifier ultrafast (e like me ka fiber optic amplifier) e hoʻonui ai i ka mana kiʻekiʻe a me ka mana puka maʻamau.
Ka manawa hoʻouna: Iune-20-2023