Photon etc. LLTF Contrast - Supercontinuum Tunable Filter for High Sensitivity Spectroscopy and Precise Calibration

LLTF Contrast - Photon etcPlay

Applications

The LLTF can be easily coupled to a supercontinuum laser, providing a tunable laser source (TLS) capable of delivering a quasi-monochromatic output across a wide spectral range from 400 nm to 2500 nm. This tool can be used in various experiments and research fields, including photoluminescence, absorption spectroscopy, hyperspectral imaging, instrument calibration, and more.

Characterization of dielectric thin film filters (OD of up to 12) [1]

A transmittance measurement setup using the LLTF is employed to obtain spectrally resolved characterization of dielectric thin film filters with optical densities from 0 to 12 in a spectral range covering 400 nm to 1000 nm.

Time-resolved photoluminescence (TRPL) on photovoltaic materials [2]

Metastable defects in CIGS solar cells can be characterized with time-resolved photoluminescence (TRPL). TRPL is a technique where the sample is excited with a pulsed light and the luminescence signal decay is analyzed as a function of time. The excitation source is produced by combining a supercontinuum source with an LLTF (ps resolution achieved).“The developed contactless characterization method was compared with classical current–voltage measurements. TRPL leads to a more complete understanding of the physics of metastable defects in terms of quantifying the shift in minority charge carriers dynamics that it induces.”

Spectral Response of Photodetectors

Combined with a supercontinuum source, the outstanding out-of-band rejection and the wide spectral range covered by the LLTF (400-1000 nm VIS, 1000-2300 nm SWIR, 400-2500 nm EXT IV) allow the precise calibration of a vast array of photodetectors including CCD, EMCCD, sCMOS, InGaAs, MCT and more.In addition to focal plane arrays, the supercontinuum tunable filtercan be used to calibrate single-pixel detectors such as photodiodes (APD, SPD, etc.), photomultiplier tubes (PMTs), or any other photosensitive device within this spectral range.

Explore the various configurations and options available with Photon etc.

[1] Lequime, M., Liukaityte, S., Zerrad, M., & Amra, C. (2015). Ultra-wide-range measurements of thin-film filter optical density over the visible and near-infrared spectrum. In Optics Express (Vol. 23, Issue 20, p. 26863). The Optical Society. https://doi.org/10.1364/oe.23.026863[2] El-Hajje, G., Ory, D., Paire, M., Guillemoles, J.-F., & Lombez, L. (2016). Contactless characterization of metastable defects in Cu(In,Ga)Se 2 solar cells using time-resolved photoluminescence. In Solar Energy Materials and Solar Cells (Vol. 145, pp. 462–467). Elsevier BV. https://doi.org/10.1016/j.solmat.2015.11.016

Contact Photon etc. for more information on these applications: [email protected].There are numerous possible LLTF configurations whose spectral range and bandwidth can be finely tuned to fit specific needs. The specifications below of several tried-and-tested standard models may serve as a starting point.