Fabrication, microstructure, and optical properties of Tm:Y₃ScAl₄O₁₂ laser ceramics

Abstract

Transparent 4 at.% Tm:Y3ScAl4O12 (Tm:YSAG) laser ceramics were fabricated by solid‐state reaction combined with vacuum sintering method. The 4 at.% Tm:YSAG ceramic sample sintered at 1800°C for 30 hours possesses homogenous microstructure and excellent optical properties, showing a transmittance of 79.3% at 2000 nm. The absorption and emission spectra of the Tm:YSAG ceramics are studied and compared with those of 4 at.% Tm:Y3Al5O12 ceramics. The introduction of Sc3+ greatly affects the energy levels of the Tm3+, causing the disappearance and degeneration of some absorption and emission peaks in the middle infrared region. The laser performance of the 4 at.% Tm:YSAG ceramics is also tested in the Quasi‐continuous‐wave (QCW) mode by pumping with a 790 nm laser diode (LD). A maximum laser output power of 0.54 W with a slope efficiency of 4.8% is achieved, which is the first laser output for Tm:YSAG ceramics.

Оптические и лазерные характеристики Yb:YSAG-керамики

“…Было проведено сравнение полученных результатов с генерационными характеристиками аналогичных керамик (табл. 3) [33][34][35][36]. Достигнутые в настоящей работе величины дифференциального КПД и КПД генерации были сопоставимыми с литературными данными, при этом максимальный коэффициент пропускания выходного зеркала был меньше, чем в упомянутых работах.…”

An efficient blue-excitable broadband Y3ScAl4O12:Ce3+ garnet phosphor for WLEDs

“…Some studies have shown that the introduction of Sc 3+ will lead to the increase of the disorder of the matrix structure, which is conducive to the broadening of the emission spectrum of rare earth ions doped in the matrix. [18][19][20][21][22] In this paper, YSAG:Ce 3+ and YAG:Ce 3+ phosphors were successfully synthesised by high-temperature solid-phase method and their luminescent properties were investigated. Compare with the emission spectrum of YAG:Ce 3+ , the emission spectrum of YSAG:Ce 3+ is blue-shifted by 10 nm.…”

“…Some studies have shown that the introduction of Sc 3+ will lead to the increase of the disorder of the matrix structure, which is conducive to the broadening of the emission spectrum of rare earth ions doped in the matrix. 18–22…”

Achievements and Future Perspectives of the Trivalent Thulium-Ion-Doped Mixed-Sesquioxide Ceramics for Laser Applications

“…Thanks to many efforts made to improve the manufacturing techniques, in recent years Tm 3+ -doped mixed-sesquioxide ceramics such as (Lu,Y) 2 O 3 [ 51 , 52 ], (Sc,Y) 2 O 3 [ 53 ], and (Lu,Sc) 2 O 3 [ 54 , 55 , 56 ], as well as garnets (i.e., YSAG [ 57 , 58 ]), have been fabricated and their potentiality tested, finding excellent results. For instance, pulses as short as 54 fs were generated in Tm:(Lu 2/3 Sc 1/3 ) 2 O 3 [ 52 ], and a CW tuning range of 200 nm was measured in Tm:LuYO 3 [ 59 ].…”