All these holographic and interferometric techniques require single-frequency or single-longitudinal-mode (SLM) lasers in the visible spectrum with long coherence length, excellent wavelength stability and accuracy, as well as high, stable output powers . As the applications of these techniques are transitioning from laboratory settings to production-scale environments the demands on performance reliability and stability over long time periods and variable environmental conditions are increasing.
HÜBNER Photonics’ Cobolt laser portfolio of single longitudinal mode (SLM) diode pumped lasers (DPL) offers a large selection of lasers with wavelengths ranging from the UV to the near-IR. With stable coherence lengths of 100´s meters, perfect TEM00 beams, excellent wavelength stability over a wide range of operating temperatures and proven reliability, these lasers are ideal for demanding holography applications also in industrial settings. In the visible range, a large number of fixed wavelength lines in the blue-green-red region are available (e.g 457 nm, 473 nm, 491 nm, 515 nm, 532 nm, 561 nm, 640 nm, 660 nm) with output powers on the scale of half a watt, giving flexibility to select the most optimal wavelengths depending on the emulsions and illumination source.
In addition, the tunable single-frequency laser C-WAVE offers unique features for holography applications. The enormous flexibility in wavelength selection from the C-WAVE can allow for complete customization of the writing wavelength, making the hologram more difficult to copy and thus extremely attractive for security-based applications. The tunability of the wavelength also allows tailoring of the exposure wavelength to the specific color of the illumination sources (e.g., LEDs), which improves the quality of the hologram or HOE.
 “The Nobel Prize in Physics 1971”. Nobelprize.org.
 Sarakinor, A., Lembessis, A., “Color Holography for the Documentation and Dissemination of Cultural Heritage : OptoClones™ and Four Museums in Two Countries”, Journal of Imaging (15 June 2019)
 Hens, K., Sperlinga, J., Sherliker, B., Waasem, N., Ricks, A., Lewis, J., Elgcrona, G.,” Lasers for holographic applications: important performance parameters and relevant laser technologies,” Proc. SPIE 10944, Practical Holography XXXIII: Displays, Materials, and Applications, 1094408 (1 March 2019)