Abstract

Er:Cr:YSGG is a well know crystal with laser emission at 2.79 µm [1] useful for medical applications and particularly for dentistry [2]. Energy transfer between Cr and Er allows to pump this crystal with flashlamps. In a search for new sources emitting in the SWIR, we propose to revisit this crystal with a new way of pumping: with LEDs. Er:Cr:YSGG generally operates on its ⁴I_11/2 → ⁴I_13/2 transition for laser emission at 2.79 µm. Its ⁴I_13/2→⁴I_15/2 transition around 1.6 µm can also be investigated for spontaneous emission. Indeed, this wavelength range is interesting for high-brightness, spectrally broadband and incoherent sources in the SWIR adapted for InGaAs cameras. In order to collect the spontaneous emission efficiently, a geometry of luminescent concentrator (LC) can be used [3]. The purpose of this work is to investigate the performance of Er:Cr:YSGG on both transitions.

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