VIRTUALLY IMAGED PHASED ARRAY HAVING LENS DISPOSED IN ORDER TO OBTAIN BROAD BEAM WIDTH

摘要

PROBLEM TO BE SOLVED: To enable the simultaneous sepn. of plural carriers from wavelength divided multiples light with simple constitution by using an apparatus which has first to third lenses and an angle dispersion device and receives input light of respective wavelengths within a continuous range of wavelengths. SOLUTION: The first lens 200 collimates input light when viewed laterally. The lens does not possess the effect of a lens when viewed from front. The second lens 202 receives the input light from the first lens 200 and condenses the input light when viewed laterally. The lens does not possess the effect of a lens when viewed from front. The third lens 204 receives the input light from the second lens 202 and collimates the input light when viewed from front. The lens does not possess the effect of a lens when viewed laterally. The light from the third lens is received in a virtually imaged phased array(VIPA) 76. This VIPA 76 forms the output light which is spatially discriminatable from the output light formed with respect to the input light having any other wavelengths within the continuous range of the wavelengths.