#### Tre

##### New member

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- Aug 31, 2015

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I don't know how to say all that I want to but I will try, please correct me if I am wrong. I did not understand the measurement mrad before so I think this will be good for people to understand what it means

1 mrad (milliradian) = 0.057296°

Assuming the starting diameter is negligible and the far field is near the aperture A one mrad beam will have a diameter of 1 meter at 1 km, 2mrad = 2m @ 1km and so on. Typically lower divergence is desired except in special uses such as signalling devices Rescue Laser Flare Magnum.

Anything else to add?

Just for fun- if you pointed a 1 mrad laser at the moon the 'dot' would be as big as the distance between Bakersfield and San Francisco, California or about 1̶/̶6̶ (1/10) the diameter of the moon.

1 mrad (milliradian) = 0.057296°

Assuming the starting diameter is negligible and the far field is near the aperture A one mrad beam will have a diameter of 1 meter at 1 km, 2mrad = 2m @ 1km and so on. Typically lower divergence is desired except in special uses such as signalling devices Rescue Laser Flare Magnum.

Anything else to add?

Just for fun- if you pointed a 1 mrad laser at the moon the 'dot' would be as big as the distance between Bakersfield and San Francisco, California or about 1̶/̶6̶ (1/10) the diameter of the moon.

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