Laser can act like an opaque object casting a shadow; could lead to using a laser beam to control another laser beam
"directed high-power laser through ruby crystal cube/ specific laser wavelengths creating shadow due to optical nonlinear absorption, influencing another optical field... green laser enters ruby with blue laser from side, changing material response to blue wavelength... green laser acts like object, increases optical absorption of the blue, creating matching region in illuminating light with lower optical intensity... optical switching, high-power lasers"
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