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Full phase and amplitude control in computer generated holography

: Fratz, M.; Fischer, P.; Giel, D.M.

Postprint urn:nbn:de:0011-n-1108793 (416 KByte PDF)
MD5 Fingerprint: bec0a29d259dc9a78aea33ca2817734e
Erstellt am: 25.11.2009

Optics Letters 34 (2009), Nr.23, S.3659-3661
ISSN: 0146-9592
ISSN: 1539-4794
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IPM ()
diffractive optics; computer holography

We report what we believe to be the first realization of a computer-generated complex-valued hologram recorded in a single film of photoactive polymer. Complex-valued holograms give rise to a diffracted optical field with control over its amplitude and phase. The holograms are generated by a one-step direct laser writing process in which a spatial light modulator (SLM) is imaged onto a polymer film. Temporal modulation of the SLM during exposure controls both the strength of the induced birefringence and the orientation of the fast axis. We demonstrate that complex holograms can be used to impart arbitrary amplitude and phase profiles onto a beam and thereby open new possibilities in the control of optical beams.