Interferometric Terahertz Wavefront Analysis

Emmanuel Abraham (1) , Takayuki Ogawa (2) , Mathilde Brossard (3, 1) , Takeshi Yasui (2)

1 LOMA - Laboratoire Ondes et Matière d'Aquitaine
2 Graduate School of Advanced Technology and Science [Tokushima]
3 NeTHIS - New Terahertz Imaging Systems

Wavefront characterization of terahertz beams is useful for various applications such as terahertz spectroscopy and imaging. In this paper, we report on the aberration measurement of a terahertz beam issued from a quantum cascade laser. By using a terahertz camera and a two-wave noncommon path interferom-eter, we measured the wavefront distortions. As an example, we evaluated the Zernike coefficients giving the aberrations of spherical wavefronts induced by a converging lens. Associated with a deformable mirror, the sensor will open the route to terahertz adaptive optics.

Mots clés: Terahertz imaging; Wavefront; Optical aberrations; Quantum cascade laser QCL; Interferometer

Domaines: Optique [physics.optics]

Emmanuel Abraham, Takayuki Ogawa, Mathilde Brossard, Takeshi Yasui. Interferometric Terahertz Wavefront Analysis. IEEE Journal of Selected Topics in Quantum Electronics, 2017, 23 (4), pp.8400505 (1 - 5). ⟨10.1109/JSTQE.2016.2638540⟩. ⟨hal-01495946⟩