20 February 2014 Sum frequency generation process for a new astronomical instrument
Author Affiliations +
We propose an exotic use of sum frequency generation process (SFG) to develop a new kind of high resolution interferometer for astronomical imaging. SFG is well known to be intrinsically a noiseless non linear process of upconversion which permits a wavelength shift. Thereby we propose to shift astronomical MIR and FIR radiation to shorter wavelength where optical fibers and optical components are available and efficient. In order to demonstrate the validity of this method for high resolution imaging, we plan to set up a two-arm upconversion interferometer on the CHARA telescope array (California). Each arm would include an upconversion stage at the focus of telescope. The success of such a project is obviously conditioned by the quality of nonlinear components (waveguided PPLN) in term of efficiency and noise biases. Moreover, coherence study requires the use of identical non linear components which implies manufacturing constraints. To ensure the feasibility of this project, several studies have been conducted. By implementing an upconversion interferometer in laboratory we have recently demonstrated our ability to analyze the coherence properties of a 1550nm signal at visible wavelength. We also have successfully converted astronomical light using one arm of this interferometer at the Hawaï observatory. It showed the capability of our instrument to astronomical observing conditions in photon counting regime. A preliminary mission at CHARA observatory allowed us to check the compatibility of our instrument with the environment onsite and expected photometric levels. From these data we estimate to be able to study the coherence of astronomical target at 1550nm using such an instrument.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. Baudoin, R. Baudoin, J. T. Gomes, J. T. Gomes, L. Delage, L. Delage, L. Grossard, L. Grossard, T. A. Ten Brummelar, T. A. Ten Brummelar, N. J. Scott, N. J. Scott, J. Sturmann, J. Sturmann, F. Reynaud, F. Reynaud, "Sum frequency generation process for a new astronomical instrument", Proc. SPIE 8964, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications XIII, 89641G (20 February 2014); doi: 10.1117/12.2039083; https://doi.org/10.1117/12.2039083


The VLTI roadmap for the next decade
Proceedings of SPIE (July 08 2018)
Polarization fidelity in an optical interferometer
Proceedings of SPIE (July 27 2008)
VLTI auxiliary telescopes: assembly, integration and testing
Proceedings of SPIE (February 20 2003)
Polarization Effects In Astronomical Spatial Interferometry
Proceedings of SPIE (January 24 1990)
Interferometric fiber arms for stellar interferometry
Proceedings of SPIE (September 12 1994)

Back to Top