Wavefront detection

For assessment of the light field's phase distribution apart from mere beam profiling, camera based wavefront sensors according to the Hartmann-Shack principle are being utilized. The determination of (interpolated) beam profile, wavefront and beam parameters such as diameter, divergence and M² value for coherent radiation enables a complete description of the propagation behavior (cf. Figure 1) via solution of the Fresnel diffraction integral. Thus, the intensity distribution e.g. in far field or at the beam waist may be calculated. The derivation of these values from a single measurement with an accuracy of a few percent makes the device especially suitable for pulsed or strongly fluctuating laser sources.

The wavefront sensor is available as a commercial product, distributed by LOT Quantum Design for the European market (USA: Lightspeed Technologies), that is already applied by several companies and institutes.

Product flyer “Wavefront sensor” (PDF) 

 

Further information: 

Produktflyer Wellenfrontsensor (PDF)

B. Flöter et al.:
EUV Hartmann sensor for wavefront measurements at the Free-electron LASer in Hamburg,
New J. Phys. 12 (2010)

B. Flöter et al.:
Beam parameters of FLASH beamline BL1 from Hartmann wavefront measurements,
Nucl. Instr. Meth. Phys. Res. 635 (2011)

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Laser-Laboratorium Göttingen e.V. (LLG)

Contact person:

Head of department
Dr. Klaus Mann
"Optics / Short Wavelengths"

Tel.: +49(0)551/5035-41
FAX: +49(0)551/5035-99
kmann(at)llg-ev.de