Liquid-crystal prisms for tip-tilt adaptive optics

Love, Gordon D.; Major, J. V.; Purvis, Alan

doi:10.1364/ol.19.001170

Cited by 68 publications

(38 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are two key components. The first is the well-known overdrive method [6][7][8], which is related to the transient nematic ef-fect [9]. We demonstrate here a successful implementation of a real-time multi-frame overdrive method.…”

Section: Introductionmentioning

confidence: 95%

Speeding up liquid crystal SLMs using overdrive with phase change reduction

Thalhammer¹,

Bowman²,

Love³

et al. 2013

Opt. Express

Self Cite

View full text Add to dashboard Cite

Nematic liquid crystal spatial light modulators (SLMs) with fast switching times and high diffraction efficiency are important to various applications ranging from optical beam steering and adaptive optics to optical tweezers. Here we demonstrate the great benefits that can be derived in terms of speed enhancement without loss of diffraction efficiency from two mutually compatible approaches. The first technique involves the idea of overdrive, that is the calculation of intermediate patterns to speed up the transition to the target phase pattern. The second concerns optimization of the target pattern to reduce the required phase change applied to each pixel, which in addition leads to a substantial reduction of variations in the intensity of the diffracted light during the transition. When these methods are applied together, we observe transition times for the diffracted light fields of about 1 ms, which represents up to a tenfold improvement over current approaches. We experimentally demonstrate the improvements of the approach for applications such as holographic image projection, beam steering and switching, and real-time control loops.

show abstract

Section: Introductionmentioning

confidence: 95%

Speeding up liquid crystal SLMs using overdrive with phase change reduction

Thalhammer¹,

Bowman²,

Love³

et al. 2013

Opt. Express

Self Cite

View full text Add to dashboard Cite

show abstract

“…Nematic liquid crystal (LC) has been widely used for amplitude and phase modulations, such as displays [1,2], optical communications [3], adaptive lens [4][5][6][7][8], and tunable photonic devices [9,10]. The applied voltage can be either a square, sinusoidal or saw-tooth wave and the frequency can range from tens to a few kilo-hertz.…”

Section: Introductionmentioning

confidence: 99%

Second and Fourth Harmonic Frequencies in Electric Field-Induced Liquid Crystal Reorientations

Nie

Xianyu

Tie-jun

et al. 2008

Molecular Crystals and Liquid Crystals

View full text Add to dashboard Cite

The second and fourth harmonics of low frequency electric field-induced liquid crystal reorientations are analyzed theoretically and confirming results observed experimentally. These transient dynamic optical responses manifest when the phase of a homogeneous cell is nearby Np or ðN À 1 2 Þp, where N is an integer. These ripples would influence the grayscales of liquid crystal devices if the driving electric field frequency is comparable to the liquid crystal response rate.

show abstract

“…Modal devices [5,4] were chosen because of their simplicity, the continuity of the phase profile (and thus high efficiency), and the fact that the focal length can be continuously changed. Furthermore it is possible to produce tip/tilt phase profiles [10] with the same structures which means that the transverse position of the image can also be shifted. However it would be also possible to use other adaptive LC-structures.…”

Section: Introductionmentioning

confidence: 99%