Neil Mark A A, Juskaitis Rimas, Booth Martin J, Wilson Tony, Tanaka Tomokazu, Kawata Satoshi
Department of Engineering Science, University of Oxford, UK.
Appl Opt. 2002 Mar 1;41(7):1374-9. doi: 10.1364/ao.41.001374.
We describe an active optical system that both measures and corrects the aberrations introduced when writing three-dimensional bit-oriented optical memory by a two-photon absorption process. The system uses a ferroelectric liquid-crystal spatial light modulator (FLCSLM) configured as an arbitrary wave-front generator that is reconfigurable at speeds as great as 2.5 kHz. A method of aberration measurement by the FLCSLM wave-front generator is described. The same device is also used to correct the induced aberrations by preshaping the wave fronts with the conjugate phase aberration as well as to scan the focal spot in three dimensions. Experimental results show the correction of both on- and off-axis aberrations, allowing the writing of data at depths as great as 1 mm inside a LiNbO3 crystal.
我们描述了一种有源光学系统，该系统可测量并校正通过双光子吸收过程写入三维位相型光学存储器时引入的像差。该系统使用配置为任意波前发生器的铁电液晶空间光调制器（FLCSLM），其可在高达2.5 kHz的速度下重新配置。描述了一种通过FLCSLM波前发生器进行像差测量的方法。同一器件还用于通过用共轭相位像差对波前进行预整形来校正诱导像差，以及在三维空间中扫描焦点。实验结果表明，该系统可校正轴上和离轴像差，从而能够在铌酸锂晶体内部深达1 mm处写入数据。
