In:
Optical Materials Express, Optica Publishing Group, Vol. 12, No. 2 ( 2022-02-01), p. 673-
Abstract:
We report on the growth, structure, polarized spectroscopy and
efficient continuous-wave laser operation of an Yb 3+ -doped disordered calcium gadolinium borate
crystal, Yb 3+ :Ca 3 Gd 2 (BO 3 ) 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 Ca 2+ and
Gd 3+ |Yb 3+ 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 Yb 3+ , σ SE is
0.42×10 −20 cm 2 at 1025.1 nm for
light polarization E || c and the luminescence lifetime of the 2 F 5/2 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.
Type of Medium:
Online Resource
ISSN:
2159-3930
Language:
English
Publisher:
Optica Publishing Group
Publication Date:
2022
detail.hit.zdb_id:
2619914-2
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