Abstract
We report, for the first time to our knowledge, a diode-pumped continuous-wave microchip Er,Yb:YMgB5O10 laser. The purpose of this work was to study the growth technique, spectroscopic properties and continuous-wave laser performance of Er3+,Yb3+:YMgB5O10 novel crystal. Absorption and luminescence spectra as well as kinetics of luminescence decay were studied. Ytterbium-erbium energy transfer efficiency was determined. The output characteristics (output power, slope efficiency, laser wavelength) of Er3+,Yb3+:YMgB5O10 laser were determined.Two intensive absorption bands with peaks centered at 937 nm and 976 nm were observed in the absorption spectra at the wavelength near 1 μm. The maximum value of absorption cross-section was determined to be 1.5·10–20 cm2 at 976 nm for polarization E//Ng . A number of narrow lines were observed in the absorption spectra in the 1425–1575 nm spectral range (transition 4I15/2 → 4I13/2 of erbium ions). The lifetime of the upper laser level 4I13/2 of Er3+ ions was determined to be 390 ± 20 μs. The ytterbium-erbium energy transfer efficiency for YMgB5O10 crystal with 2 at.% of Er3+ and 11 at.% for Yb3+ was close to 84 %. The maximal continuous-wave output power of 0.2 W with slope efficiency of 8 % regarding to absorbed pump power was realized at the wavelength of 1570 nm. With the improvement of cavity parameters the output laser performance of the Er,Yb:YMgB5O10 crystal can be further enhanced.Taking into account high thermal conductivity of ≈ 6.2 W·m–1·K–1, the Er,Yb:YMgB5O10 crystal can be considered as a good gain medium for 1.5 μm lasers for applications in laser rangefinder and LIDAR systems.
Highlights
Nowadays eye-safe lasers emitting in 1.5– 1.6 μm spectral range find application in LIDAR systems for robots, self-driving cars, etc. due to its eye-safety and high transparency of the atmosphere
Many sources are emitting in this spectral range, but solid-state lasers on Er3+ and Yb3+codoped crystals are of greatest interest
Phosphate glasses currently are the leading Er3+, Yb3+-codoped laser materials, because they combine very efficient energy transfer from Yb3+ to Er3+ ions (η ≈ 90 %) with a long lifetime of the erbium upper laser level 4I13∕2 (7–8 ms) and short lifetime of the 4I11∕2 energy level (2–3 μs), which prevents the depopulation of this level because of excited-state absorption and upconversion processes [1]
Summary
Nowadays eye-safe lasers emitting in 1.5– 1.6 μm spectral range find application in LIDAR systems for robots, self-driving cars, etc. due to its eye-safety and high transparency of the atmosphere. Эффективность переноса энергии от ионов иттербия к ионам эрбия для кристалла Er(2 ат.%),Yb(11 ат.%):YMgB5O10 достигала 84 %. Many sources are emitting in this spectral range, but solid-state lasers on Er3+ and Yb3+codoped crystals are of greatest interest.
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