Abstract
We demonstrate a broadband wavelength converting system for incoherent amplified spontaneous emission (ASE) sources. It is based on single-pass difference frequency generation using a periodically poled stoichiometric lithium tantalate crystal placed inside the cavity of a tuneable self-injection-locked diode-pumped Cr <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3+</sup> :LiCAF laser. A spectral bandwidth of ~ 30 nm around 1550 nm is converted within a tuneable shift of ~ 12 nm. The technique we propose does not only provide ASE sources in new spectral allocations but it also opens up a way to perform spectral shaping.
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