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Diffractive
optics opens unique possibilities to affect only one wavelength. In
multi-wavelength light beams the dual wavelength beam combiners are
diffractive optical elements used to combine two incident beams with
different wavelengths into the same focal point. In order to gain a super
imposed spot on a required plane one just have to place a transparent
diffractive optical element in the path of the laser beam towards the spot.
No doublets are used anymore, only one hybrid diffractive element with
microrelief on the plane side (dual wavelength product). The durability of diffractive beam combiner
is far better then two lens system. |
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