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I assume you are talking about the beam width at the lens output when focused to infinity.
It depends on the laser diode, but it can be as much as about 6mm wide as the lens barrel is 9mm wide and the output opening is about 6mm wide.
It depends on the laser diode, but it can be as much as about 6mm wide as the lens barrel is 9mm wide and the output opening is about 6mm wide.
