Open AccessPerformance of varifocal lenses using KTa 1 − x Nb x O 3 crystals with response times faster than 2 μs
Author(s) -
Imai T.,
Takayama Y.,
Miyazu J.,
Kobayashi J.
Publication year - 2013
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
ISSN - 1350-911X
DOI - 10.1049/el.2013.1962
Subject(s) - lens (geology) , optics , materials science , wavelength , power (physics) , crystal (programming language) , optical power , focus (optics) , optoelectronics , physics , computer science , laser , programming language , quantum mechanics
A varifocal lens (previously reported by the authors) made of a single crystal of potassium tantalite niobate (KTa 1− x Nb x O 3 , KTN) is characterised by its fast responses and large apertures (∼ 3 mm). Presented is a report on the focus shift performance of this varifocal lens with response times of < 2 μs. To investigate this quick response, a strobe technique was introduced. It was confirmed that the KTN lens changed its lens power in 2 μs as predicted by the theory stating that the lens power is proportional to the square of the applied voltage. The lens power can be controlled from 0 to 0.8 m −1 at a wavelength of 1.06 μm.