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In laser science, the beam parameter product (BPP) is the product of a laser beam's divergence angle (half-angle) and the radius of the beam at its narrowest point (the beam waist).[1] The BPP quantifies the quality of a laser beam, and how well it can be focused to a small spot.
A Gaussian beam has the lowest possible BPP, λ / π, where λ is the wavelength of the light.[1] The ratio of the BPP of an actual beam to that of an ideal Gaussian beam at the same wavelength is denoted M² ("M squared"). This parameter is a wavelength-independent measure of beam quality.
Optro你看看,是不是糊涂蛋,1.27倍波长能行不? M2是M数的平方吗? |
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