Eggert Helge A, Imbrock Jörg, Bäumer Christoph, Hesse Hartmut, Krätzig Eckhard
Fachbereich Physik, Universität Osnabrück, 49069 Osnabrück, Germany.
Opt Lett. 2003 Oct 15;28(20):1975-7. doi: 10.1364/ol.28.001975.
Infrared holographic recording in a two-step process is demonstrated in stoichiometric iron-doped lithium tantalate crystals. Through absorption of two intersecting infrared pulses (A = 1064 nm) a temperature grating and thus a modulated pyroelectric field build up. Free electrons, excited by homogeneous light of a shorter wavelength (lambda = 532 nm) drift in this field, and a phase hologram is stored that can be read nondestructively. The change in refractive index depends mainly on the absorption coefficient at the wavelength of the recording light and on the intensity of the infrared light. The proposed method may be extended to telecommunication wavelengths by choice of suitable dopants.
在化学计量比的掺铁钽酸锂晶体中展示了两步法红外全息记录。通过吸收两个相交的红外脉冲（波长λ = 1064 nm），形成温度光栅，进而建立起调制的热电场。由较短波长（λ = 532 nm）的均匀光激发的自由电子在该电场中漂移，存储了可无损读取的相位全息图。折射率的变化主要取决于记录光波长处的吸收系数以及红外光的强度。通过选择合适的掺杂剂，所提出的方法可扩展到电信波长。
