Applied Physics B

, Volume 89, Issue 4, pp 513–516

Ultrashort-pulse dual-wavelength source for digital holographic two-wavelength contouring

  • T. Hansel
  • J. Müller
  • C. Falldorf
  • C. von Kopylow
  • W. Jüptner
  • R. Grunwald
  • G. Steinmeyer
  • U. Griebner
Article

DOI: 10.1007/s00340-007-2849-6

Cite this article as:
Hansel, T., Müller, J., Falldorf, C. et al. Appl. Phys. B (2007) 89: 513. doi:10.1007/s00340-007-2849-6

Abstract

Digital holographic shape measurements using femtosecond laser pulses are reported. For contouring of very fast moving objects, the simultaneous generation of at least two spectrally separated ultrashort pulses is required. To deliver this particular spectral signature at high pulse energies, a chirped-pulse Ti:sapphire laser amplifier was modified to emit two spectrally separated pulses with energies above 1 μJ each. The wavelength separation of these pulses was adjustable within the 50 nm gain bandwidth, cutting out two distinct wavelength peaks by a variable double-slit assembly in a prism sequence. A Michelson-type interferometer was employed to perform the two-wavelength contouring. The phases of the holograms and the phase differences are calculated numerically, which allow us to deduce the contour lines of the topology of the object. The suitability of the light source for digital holography is demonstrated with contouring of stationary objects and the potential for high-speed applications is indicated.

Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • T. Hansel
    • 1
  • J. Müller
    • 2
  • C. Falldorf
    • 2
  • C. von Kopylow
    • 2
  • W. Jüptner
    • 2
  • R. Grunwald
    • 1
  • G. Steinmeyer
    • 1
  • U. Griebner
    • 1
  1. 1.Max-Born-InstitutBerlinGermany
  2. 2.Bremer Institut für angewandte StrahltechnikBremenGermany