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 (1) What is Er glass？ Er3+, Yb3+ co-doped phosphate glass ( Er, Yb: phosphate glass ) is a popular and normally used active device for lasers generating in the "eye-safe" spectral range of 1,5-1,6 µm. (2) What's the system of erbium glass? Phosphate glass integrates a long life time (~ 8 ms) of 4I13/2 Er3+ top laser degree with a low (2-3 ms) life time of 4I11/2 Er3+ level that continues to be in vibration with Yb3+ 2F5/2 fired up state. Quick non-radiative multi-phonon leisure from 4I11/2 to 4I13/2 level significantly reduces the back-energy transfer as well as up-conversion losses due to the communication between Yb3+ and also Er3+ ions, thrilled at the 2F5/2 along with the 4I11/2 levels, respectively. Essentially continuously, erbium-ytterbium-doped phosphate glass is pumped with wavelengths around the 975-nm absorption height of Yb3+ ions. That leads to the excitation of the ytterbium ions. Afterwards, the excitation power might be transferred to close-by erbium ions...

 Er, Cr, Yb: Glass laser glass for eye safe 1.5 μm laser of lidar ranging and medical application @CRYLINK Erbium Glass doped with Er3+, Yb3+ and Cr3+, Erbium doped glass laser provides a useful coherent source in the spectral range near 1.5 μm, which is relatively safe for the human eye and is convenient in many applications, such as lidar and range measurements, fiber-optic communication, and laser surgery. In spite of the considerable progress in the development of InGaAs laser diode pump sources, Xe flashlamp will continue to be used as pump sources of Er:glass lasers because of their high reliability and low cost, and also the simplicity of design of such systems. Since about half the flashlamp radiation energy is emitted in the visible and near infrared (IR) ranges, a second sensitizer Cr3+ is introduced into Yb-Er laser glasses to utilize this energy.