E hoʻolauna i nā laser pulsed fiber

Hoʻolaunafiber pulsed lasers

ʻO nā laser Pulsed Fibernā mea hana lasere hoʻohana ana i nā fibers i hoʻopaʻa ʻia me nā iona honua laha ʻole (e like me ytterbium, erbium, thulium, a me nā mea ʻē aʻe) ma ke ʻano he kumu waiwai. Loaʻa iā lākou kahi medium gain, kahi lua resonant optical, a me kahi puna puna. Loaʻa i kāna ʻenehana hoʻomohala pulse ka ʻenehana Q-switching (pae nanosecond), ka paʻa ʻana o ke ʻano hana (ka pae picosecond), ka laka paʻa paʻa (femtosecond level), a me ka ʻenehana nui oscillation power amplification (MOPA).

Hoʻopili nā noi ʻenehana i ka ʻoki metala, ka hoʻoheheʻe ʻana, ka hoʻomaʻemaʻe ʻana i ka laser a me ka ʻoki ʻana i ka pā lithium TAB i ke kahua ikehu hou, me ka mana hoʻopuka multi-mode a hiki i ka pae ʻumi tausani-watt. Ma ke kahua o ka lidar, 1550nm pulsed lasers, me ko lākou ikaika pulse kiʻekiʻe a me nā hiʻohiʻona palekana maka, ua hoʻohana ʻia i nā ʻōnaehana radar a me nā kaʻa.

ʻO nā ʻano huahana nui ke ʻano Q-switched type, MOPA type a me ka fiber mana kiʻekiʻenā laser pulsed. Māhele:

1. Q-switched fiber laser: ʻO ke kumu o ka Q-switching ka hoʻohui ʻana i kahi mea hiki ke hoʻololi ʻia i loko o ka laser. I ka nui o ka manawa, nui ka poho o ka laser a aneane ʻaʻohe puka māmā. I loko o kahi manawa pōkole loa, hiki i ka laser ke hoʻopuka i kahi puʻupuʻu pōkole loa. Hiki ke hoʻokō ʻia nā laser fiber Q-switched me ka ikaika a i ʻole passive. Hoʻokomo pinepine ka ʻenehana ikaika i ka hoʻohui ʻana i kahi modulator ikaika i loko o ka lua e kāohi ai i ka nalowale o ka laser. Hoʻohana nā ʻenehana passive i nā mea hoʻoheheʻe saturated a i ʻole nā ​​hopena linear ʻē aʻe e like me ka hoʻoulu ʻia ʻana o Raman scattering a hoʻoulu ʻia ʻo Brillouin scattering e hana i nā mīkini Q-modulation. ʻO nā pulses maʻamau i hana ʻia e nā ala Q-switching aia ma ka pae nanosecond. Inā e hana ʻia nā pulses pōkole, hiki ke hoʻokō ʻia ma o ke ʻano laka paʻa.

2. ʻO ka laser fiber paʻa i ke ʻano: Hiki iā ia ke hoʻohua i nā pulses ultrashort ma o ke ʻano hana paʻa a i ʻole nā ​​hana paʻa paʻa. Ma muli o ka manawa pane o ka modulator, ʻo ka laulā pulse i hana ʻia e ka paʻa ʻana o ke ʻano hana maʻamau ma ka pae picosecond. Hoʻohana ka paʻa paʻa paʻa i nā hāmeʻa paʻa paʻa, he pōkole loa ka manawa pane a hiki ke hoʻohua i nā pulses ma ka pae femtosecond.

Eia kahi hoʻolauna pōkole i ke kumu o ka laka ʻana.

Nui nā ʻano lonitudinal i loko o kahi lua resonant laser. No ke apo apo, ua like ka manawa alapine o na mode longitudinal me /CCL, kahi o C ka wikiwiki o ka malamalama a o CL ka loa o ke ala opua o ke kukui hoailona e holo ana i hookahi huakai puni iloko o ka lua. ʻO ka ʻōlelo maʻamau, ʻoi aku ka nui o ka bandwidth loaʻa o nā laser fiber, a ʻo ka nui o nā mode longitudinal e hana like. ʻO ka huina o nā ʻano ʻano e hiki ai i ka laser ke hoʻokomo ma muli o ke kaʻina mode longitudinal ∆ν a me ka loaʻa ʻana o ka bandwidth o ka loaʻa ʻana. ʻO ka liʻiliʻi o ka manawa lōʻihi lōʻihi, ʻoi aku ka nui o ka loaʻa ʻana o ka bandwidth o ka medium, a hiki ke kākoʻo ʻia nā mode longitudinal. ʻO ka mea ʻē aʻe, ʻo ka liʻiliʻi.

3. Quasi-continuous laser (QCW laser): He hana hana kūikawā ia ma waena o nā lasers nalu mau (CW) a me nā lasers pulsed. Loaʻa iā ia ka mana kiʻekiʻe koke ma o nā pulses lōʻihi i kēlā me kēia manawa (ka pōʻai hana maʻamau ≤1%) ʻoiai e mālama ana i ka mana haʻahaʻa haʻahaʻa. Hoʻohui ia i ka paʻa o nā laser mau me ka mana kiʻekiʻe o ka mana o nā laser pulsed.

ʻO ke kumu ʻenehana: Hoʻouka nā laser QCW i nā modulation modulation i ka hoʻomaulaserkaʻapuni e ʻoki i nā laser mau i loko o nā kaʻina puʻupuʻu puʻupuʻu hana kiʻekiʻe, e loaʻa ana i ka hoʻololi maʻalahi ma waena o nā ʻano hoʻomau a me ka pulse. ʻO kāna hiʻohiʻona koʻikoʻi ka "pōkole pōkole, hoʻomaha lōʻihi". ʻO ka hoʻoluʻu ʻana i ka puʻuwai puʻupuʻu e hōʻemi i ka hōʻiliʻili ʻana o ka wela a hoʻohaʻahaʻa i ka pilikia o ka deformation thermal material.

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