File:750nm laser beam passing through an iris diaphragm.jpg
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![File:750nm laser beam passing through an iris diaphragm.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/08/750nm_laser_beam_passing_through_an_iris_diaphragm.jpg/450px-750nm_laser_beam_passing_through_an_iris_diaphragm.jpg?20230831211650)
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