Affiliation:
1. China Academy of Engineering Physics
2. Chinese Academy of Sciences
3. Université de Caen Normandie
4. Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy
5. Universitat Rovira i Virgili (URV)
6. Shenzhen University
Abstract
We report on the growth, structure, polarized spectroscopy and
efficient continuous-wave laser operation of an
Yb3+-doped disordered calcium gadolinium borate
crystal,
Yb3+:Ca3Gd2(BO3)4
(Yb:GdCB). Yb:GdCB belongs to the orthorhombic class [sp. gr.
Pnma, lattice parameters
a = 7.1937(0) Å,
b = 15.5311(3) Å,
c = 8.6140(7) Å]. The
structure disorder of this material originates from a random
distribution of Ca2+ and
Gd3+|Yb3+ cations over
three non-equivalent lattice sites. This leads to broad and smooth
(“glassy-like”) absorption and emission spectra at room
and low temperatures. The stimulated-emission cross-section of
Yb3+, σSE is
0.42×10−20 cm2 at 1025.1 nm for
light polarization
E
||
c
and the luminescence lifetime of the
2F5/2 state is 644 µs. Continuous-wave
laser performance of the Yb:GdCB crystal was evaluated under
high-power diode-pumping at 976 nm for three crystal orientations
along the crystallographic axes. For an
a
-cut crystal, a maximum output power of
5.58 W was achieved at ∼1057 nm with a slope efficiency
of 51.7% and a linear laser polarization
(
E
||
c
). The demonstrated power scaling
capabilities and broadband emission properties of Yb:GdCB indicate
that it is promising for generation of sub-50 fs pulses from passively
mode-locked lasers at ∼1 µm.
Funder
National Natural Science Foundation of
China
Sino-German Scientist Cooperation and
Exchanges Mobility Program
Foundation of President of China Academy
of Engineering Physics
National Key Research and Development
Program of China
Natural Science Foundation of Fujian
Province
Foundation of Key Laboratory of
Optoelectronic Materials Chemistry and Physics, Chinese Academy of
Sciences
Foundation of State Key Laboratory of
Crystal Materials, Shandong University
Agencia Estatal de
Investigación
Subject
Electronic, Optical and Magnetic Materials
Cited by
5 articles.
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