3.8 Article

High Power Diode-Pumped Erbium Laser Emitting at Near 1.5 μm

Journal

DEVICES AND METHODS OF MEASUREMENTS
Volume 12, Issue 2, Pages 91-97

Publisher

BELARUSIAN NATL TECHNICAL UNIV
DOI: 10.21122/2220-9506-2021-12-2-91-97

Keywords

erbium; ytterbium; borate crystals; diode-pumped; continuous-wave laser operation

Funding

  1. Russian Science Foundation [19-12-00235]
  2. Russian Science Foundation [19-12-00235] Funding Source: Russian Science Foundation

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Solid-state lasers emitting in the 1.5-1.6 mu m spectral range are promising for various applications, with Er,Yb:YAl3(BO3)(4) crystals showing high energy transfer efficiency and potential for laser rangefinder, ophthalmology, and other systems emitting in this wavelength range.
Solid-state lasers emitting in the 1.5-1.6 mu m spectral range are very promising for eye-safe laser range finding, ophthalmology, fiber-optic communication systems, and optical location. The aim of this work is the investigation of spectrosposcopic and laser properties of gain medium based on borate crystal for abovementioned lasers. Spectroscopic and laser properties of Er,Yb:YAl3(BO3)(4) crystals with different concentrations of dopants were investigated. Polarized absorption and emission cross-section spectra were determined. The ytterbiumerbium energy transfer efficiency was estimated. The maximal energy transfer efficiency up to 97 % was obtained for Er(4 at.%),Yb(11 at.%):YAl3(BO3)(4) crystal. The laser operation of heavily doped crystals with erbium concentration up to 4 at.% (2.2.10(20) CM-3) was realized. By using of Er(2 at.%),Yb(11 at.%):YAl3(BO3)(4) crystal a maximal continuouswave (CW) output power of 1.6 W was obtained at 1522 nm with slope efficiency of 32 %. By using of Er(4 at.%),Yb(11 at.%):YAl3(BO3)(4) crystal a maximal peak output power up to 2.2 W with slope efficiency of 40 % was realized in quasi-continuous-wave regime of operation. The spatial profile of the output beam was close to TEM00 mode with M-2 < 1.2 during all laser experiments. Based on the obtained results, it can be concluded that Er,Yb:YAl3(BO3)(4) crystals are promising active media for lasers emitting in the spectral range of 1.5-1.6 mu m for the usage in laser rangefinder and laser-induced breakdown spectroscopy systems, and LIDARs.

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