Feem ntau siv cov ntsiab lus ntawm beam zoo muaj xws li qhov chaw deb ntawm qhov chaw radius, deb-field divergence angle, diffraction txwv ntau U, Strhl piv, factor M2 , zog rau phiaj nto los yog voj zog piv, thiab lwm yam.

Beam zoo yog ib qho tseem ceeb parameter ntawm laser. Ob qho kev nthuav qhia ntawm beam zoo yogBPP thiab M2 uas yog muab los ntawm tib lub cev lub tswv yim thiab tuaj yeem hloov dua siab tshiab los ntawm ib leeg. Laser beam zoo yog ib qho tseem ceeb vim nws yog ib qho tseem ceeb ntawm lub cev kom txiav txim seb lub laser puas zoo los tsis thiab seb tus precision processing yuav ua tau. Rau ntau hom ib hom tso zis lasers, zoo lasers feem ntau muaj beam zoo heev, sib xws rau ib tug me me heev.M2, xws li 1.05 lossis 1.1. Tsis tas li ntawd, lub laser tuaj yeem tswj cov kab teeb pom kev zoo thoob plaws hauv nws lub neej kev pabcuam, thiabM2 tus nqi yuav luag tsis hloov. Rau laser precision machining, siab zoonqaj Nws yog qhov tsim nyog rau shaping, yog li ua kom tiav lub tshuab laser saum toj kawg nkaus yam tsis muaj kev puas tsuaj rau lub substrate thiab tsis muaj thermal nyhuv. Hauv kev xyaum,M2 feem ntau yog siv rau cov khoom thiab roj lasers, thaum BPP feem ntau yog siv rau fiber ntau lasers thaum labeling cov specifications ntawm lasers.

Laser beam zoo feem ntau yog qhia los ntawm ob yam: BPP thiab M². M²feem ntau sau li M2. Cov duab hauv qab no qhia txog qhov ntev ntawm qhov kev faib tawm ntawm Gaussian beam, qhov twgW yog lub beam duav thiab θ yog qhov deb-field divergence ib nrab angle.

Kev hloov pauv ntawm BPP thiab M2

BPP (Beam Parameter Khoom) txhais tau tias yog lub duav vojvoog W muab faib ua far-field divergence ib nrab angle θ:

         PEB = W × θ

Cov far-field divergence ib nrab angle θ Gaussian beam yog:

        θ₀ = λ / πW₀

M² yog qhov piv ntawm cov khoom lag luam ntawm cov kab hluav taws xob rau cov kab hluav taws xob cov khoom lag luam ntawm cov qauv Gaussian beam:

        M² =（W×θ）/（W₀×θ₀）= BPP /（λ / π）

Nws tsis yog nyuaj rau nrhiav los ntawm cov qauv saum toj no uas BPP yog ywj siab ntawm wavelength, thaum M² kuj tsis cuam tshuam nrog laser wavelength. Lawv feem ntau cuam tshuam nrog kev tsim kab noj hniav thiab kev sib dhos ntawm lub laser.

Tus nqi ntawm M² yog infinitely ze rau 1, qhia qhov piv ntawm cov ntaub ntawv tiag tiag thiab cov ntaub ntawv zoo tagnrho. Thaum cov ntaub ntawv tiag tiag ze dua rau cov ntaub ntawv zoo tshaj plaws, cov kab teeb pom kev zoo zoo dua, uas yog, thaum twgM² yog ze rau 1, qhov sib thooj divergence lub kaum sab xis me dua, thiab cov nqaj zoo dua.

Kev ntsuas ntawm BPP thiab M2
Beam quality analyzer tuaj yeem siv los ntsuas qhov beam zoo. Beam zoo kuj tuaj yeem ntsuas los ntawm kev siv lub teeb tsom teeb nrog kev ua haujlwm nyuaj. Cov ntaub ntawv raug sau los ntawm ntau qhov chaw ntawm lub laser hla ntu thiab tom qab ntawd raug tsim los ntawm kev tsim-hauv kev tsim khoom.M2. M2 tsis tuaj yeem ntsuas yog tias muaj kev ua haujlwm tsis raug lossis ntsuas qhov yuam kev hauv cov txheej txheem ntawm kev ua piv txwv. Rau kev ntsuas lub zog siab, cov txheej txheem thev naus laus zis yuav tsum tau ua kom lub zog laser nyob rau hauv ntau qhov ntsuas tau thiab zam kev puas tsuaj ntawm qhov ntsuas ntsuas qhov chaw.

Cov tub ntxhais kho qhov muag fiber ntau thiab cov lej aperture tuaj yeem kwv yees raws li daim duab saum toj no. Rau fiber ntau lasers, lub duav vojvoog ω₀= fiber tub ntxhais txoj kab uas hla / 2 = R, θ = kev txhaumα =α= NA (tus lej aperture ntawm fiber ntau).

Summary of BPP, M2, thiab Bua eam Quality

Qhov me me BPP, qhov zoo dua laser beam zoo.

Rau 1.08µm fiber ntau lasers, M2 = 1, BPP = λ / π = 0, 344mm mrad

Rau 10.6µm CO₂ lasers, ib qho tseem ceeb hom M2 = 1, BPP = 3.38 mm mrad

Nco ntsoov tias qhov sib txawv ntawm qhov sib txawv ntawm ob qho tib si tsim nyog hom lasers (los yog ntau hom lasers nrog tib yam M2) yog tib yam tom qab tsom, lub focal diameter ntawm CO₂ laser yog 10 npaug ntawm fiber ntau laser.

Qhov ze dua M2 yog rau 1, qhov zoo dua ntawm laser beam zoo.

Thaum lub laser beam nyob rau hauv Gaussian tis los yog ze Gaussian tis, qhov ze rau qhov M2 yog rau 1, qhov ze ntawm qhov tseeb laser yog rau qhov zoo tshaj plaws Gaussian laser, qhov zoo dua cov nqaj zoo yog.