ʻO ka wehewehe ʻana maʻamau o ka maikaʻi o ka beam e pili ana i ka radius wahi mamao, ʻokoʻa kahua mamao angle, palena ʻokoʻa he nui U, Strehl ratio, kumu M2 , mana ma ili i hoʻopaʻa ʻia a i ʻole ka lakene ikehu loop, etc.
ʻO ka maikaʻi o ka beam kahi mea nui o ka laser. ʻElua mau ʻōlelo maʻamau o ka maikaʻi o ke kukuiBPP a M2 ka mea ua loaʻa ma muli o ka manaʻo kino like a hiki ke hoʻololi ʻia mai kekahi i kekahi. He mea koʻikoʻi ka maikaʻi o ka beam laser no ka mea ʻo ia ka nui kino nui e hoʻoholo ai inā maikaʻi ka laser a ʻaʻole paha ka hiki ke hana pololei. No nā ʻano laser hoʻopuka hoʻokahi-mode he nui, ʻoi aku ka maʻamau o nā lasers kiʻekiʻe kiʻekiʻe i ka maikaʻi o ka kukuna kiʻekiʻe loa, e like me ka liʻiliʻi loa.M2, e like me 1.05 a i ʻole 1.1. Eia kekahi, hiki i ka laser ke mālama i ka maikaʻi beam maikaʻi i loko o kona ola lawelawe, aM2 ʻaneʻane loli ka waiwai. No ka mīkini kikoʻī laser, kiʻekiʻe kiʻekiʻekaola ʻoi aku ka maikaʻi o ka hana ʻana, i mea e hoʻokō ai i ka mīkini laser flat top me ka ʻole o ka hōʻino ʻana i ka substrate a me ka ʻole o ka hopena wela. Ma ka hana,M2 hoʻohana nui ʻia no nā laser paʻa a me ke kinoea, ʻoiai BPP Hoʻohana nui ʻia no nā laser fiber i ka wā e hōʻailona ai i nā kikoʻī o nā lasers.
Hōʻike pinepine ʻia ka maikaʻi o ka beam laser e nā ʻāpana ʻelua: BPP a M². M²kākau pinepine ʻia e like me M2. Hōʻike kēia kiʻi i ka puunaue lōʻihi o ka lāʻau Gaussian, kahiW ʻo ia ka radius pūhaka kukuna a θ ʻo ia ka hapalua like ʻole o ke kahua mamao angle.
Ka hoohuli ana o BPP a M2
BPP (Huahana Kūlana Kūlana) ua wehewehe ʻia ʻo ka pūhaka pūhaka W hoonuiia e ʻokoʻa ʻokoʻa ka hapalua angle θ:
BPP = W × θ
ʻO ka ʻokoʻa ʻokoʻa ka hapalua angle θ ʻo ke kukui Gaussian:
θ0 = λ / πW0
M2 ʻo ia ka lakio o ka hua hoʻohālikelike kukuna i ka huahana hoʻohālikelike kukuna o ke ʻano kumu kumu ʻo Gaussian beam:
M2 =(W×θ)/(W0×θ0)= BPP /(λ / π)
ʻAʻole paʻakikī ka loaʻa ʻana mai ka ʻōlelo ma luna BPP kūʻokoʻa i ka nalu nalu, ʻoiai M² ʻAʻole pili pū me ka lōʻihi hawewe laser. Hoʻopili nui lākou i ka hoʻolālā cavity a me ka pololei o ka hui ʻana o ka laser.
Ka waiwai o M² kokoke loa i ka 1, e hōʻike ana i ka ratio ma waena o ka ʻikepili maoli a me ka ʻikepili kūpono. Ke kokoke ka ʻikepili maoli i ka ʻikepili kūpono, ʻoi aku ka maikaʻi o ka beam, ʻo ia hoʻi, i ka wāM² kokoke i ka 1, ʻoi aku ka liʻiliʻi o ke kihi ʻokoʻa like, a ʻoi aku ka maikaʻi o ka beam.
Ana ana o BPP a M2
Hiki ke hoʻohana ʻia ka mea anaana i ka maikaʻi beam e ana i ka maikaʻi o ka beam. Hiki ke ana ʻia ka maikaʻi o ka beam me ka hoʻohana ʻana i ka mea ananali māmā me ka hana paʻakikī. Hōʻiliʻili ʻia ka ʻikepili mai nā wahi like ʻole o ka pauku kea laser a laila hoʻohui ʻia e kahi papahana kūkulu ʻia e hana ai.M2. M2 ʻAʻole hiki ke ana ʻia inā he hewa a i ʻole ke ana ʻana i ka hewa i ke kaʻina o ka laʻana. No nā ana mana kiʻekiʻe, pono ʻia ka ʻōnaehana attenuation paʻakikī e mālama i ka mana laser i loko o kahi ākea hiki ke ʻike ʻia a pale aku i ka pōʻino o ka ʻili o ka mea kani.
Hiki ke koho ʻia ke kikowaena fiber optical a me ka puka helu e like me ke kiʻi ma luna. No nā laser fiber, ka radius pūhaka ω0= ke anawaena o ke kumu fiber /2 = R, θ = hewaα =α= NA (aperture helu o ka fiber).
Hōʻuluʻulu manaʻo o BPP, M2, a Beam Qpono
ʻO ka BPP liʻiliʻi, ʻoi aku ka maikaʻi ka maikaʻi o ke kukui laser.
No ka 1.08µm fiber lasers, M2 = 1, BPP = λ / π = 0.344 mm Ua haʻi aku ʻo Mrad
No 10.6µm CO2 nā lasers, ke ʻano kumu hoʻokahi M2 = 1, BPP = 3.38 mm Ua haʻi aku ʻo Mrad
Ke manaʻo nei ʻo ka ʻokoʻa ʻokoʻa o ʻelua hoʻokahi kumu ʻano hana nā lasers (a i ʻole ke ʻano he nui lasers me ka like M2) ua like ma hope o ka nānā 'ana, ke anawaena focal o ka CO2 ʻO ka laser he 10 mau manawa o ka laser fiber.
ʻO ka pili kokoke M2 i ka 1, ʻoi aku ka maikaʻi o ka maikaʻi o ka kukuna laser.
Ke komo ka kukuna laser Gmahele aussian a i ʻole kokoke i ka mahele Gaussian, ʻoi aku ka pili o ka M2 ʻo ka 1, ʻoi aku ka kokoke o ka laser maoli i ka laser Gaussian maikaʻi, ʻoi aku ka maikaʻi o ka maikaʻi o ka beam.
Ka manawa hoʻouna: Sep-02-2021