명사
The focusing of radiation into a finite-width beam that shows very little diffraction.
용법- 불가산
- usually
- 예문
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더 많은 예문 (1)
In photonic crystals, such thresholdless #92;mathcal#123;PT#125; transitions are shown to yield significant control over the band structure of the system, and can result in all-angle supercollimation, a #92;mathcal#123;PT#125;-superprism effect, and unidirectional behavior..