KY(WO4)2 crystal has a lot of potential as an on-chip waveguide material for lanthanide ion-doped, Raman active lasers and on-chip amplifiers. One method of fabricating these waveguides is by using swift carbon ion irradiation, which produces a step-like, damage-induced refractive index contrast of up to n0.2. The irradiation is followed by an annealing step to reduce color centers that cause high optical absorption, leading to an optical slab waveguide with optical transmission losses as low as 1.5 dB/cm at 1550 nm. In this article, we report an upper limit of to the annealing temperature, above which stresses and recrystallization induce additional scattering detrimental to waveguide performance. The effects are characterized using transmission electron microscopy and Raman microscopy.
REFERENCES
1.
A. A.
Kaminskii
, P. V.
Klevtsov
, L.
Li
, and A. A.
Pavlyuk
, “Stimulated emission from KY(WO4)2: Nd crystal laser
,” Phys. Status Solidi A
5
, K79
–K81
(1971
). 2.
V.
Petrov
, M. C.
Pujol
, X.
Mateos
, O.
Silvestre
, S.
Rivier
, M.
Aguiló
, R. M.
Solé
, J.
Liu
, U.
Griebner
, and F.
Díaz
, “Growth and properties of KLu(WO4)2, and novel ytterbium and thulium lasers based on this monoclinic crystalline host
,” Laser Photonics Rev.
1
, 179
–212
(2007
). 3.
Z.
Cong
, Z.
Liu
, Z.
Qin
, X.
Zhang
, H.
Zhang
, J.
Li
, H.
Yu
, and W.
Wang
, “LD-pumped actively Q-switched Nd:KLu(WO4)2 self-Raman laser at 1185 nm
,” Opt. Laser Technol.
73
, 50
–53
(2015
). 4.
M.
Pollnau
, Y. E.
Romanyuk
, F.
Gardillou
, C. N.
Borca
, U.
Griebner
, S.
Rivier
, and V.
Petrov
, “Double tungstate lasers: From bulk toward on-chip integrated waveguide devices
,” IEEE J. Select. Top. Q. Electron.
13
, 661
–671
(2007
). 5.
D.
Geskus
, S.
Aravazhi
, S. M.
García-Blanco
, and M.
Pollnau
, “Giant optical gain in a rare-earth-ion-doped microstructure
,” Adv. Mater.
24
, OP19
–OP22
(2012
). 6.
D.
Geskus
, E. H.
Bernhardi
, K.
van Dalfsen
, S.
Aravazhi
, and M.
Pollnau
, “Highly efficient Yb-doped channel waveguide laser at 981 nm
,” Opt. Express
21
, 13773
–13778
(2013
). 7.
S.
Aravazhi
, D.
Geskus
, K.
Van Dalfsen
, S. A.
Vázquez-Córdova
, C.
Grivas
, U.
Griebner
, S. M.
García-Blanco
, and M.
Pollnau
, “Engineering lattice matching, doping level, and optical properties of KY(WO4)2:Gd, Lu, Yb layers for a cladding-side-pumped channel waveguide laser
,” Appl. Phys. B: Lasers Opt.
111
, 433
–446
(2013
). 8.
E.
Gallucci
, C.
Goutaudier
, G.
Boulon
, M. T.
Cohen-Adad
, and B. F.
Mentzen
, “Nonstoichiometric KY(WO4)2: Crystal growth, chemical and physical characterization
,” J. Cryst. Growth
209
, 895
–905
(2000
). 9.
A. A.
Kaminskii
, K.
Ueda
, H. E.
Eichler
, J.
Findeisen
, S. N.
Bagayev
, F. A.
Kuznetsov
, A. A.
Pavlyuk
, G.
Boulon
, and F.
Bourgeois
, “Monoclinic tungstates KDy(WO4)2 and KLu(WO4)2—New -active crystals for laser Raman shifters
,” Jpn. J. Appl. Phys. Part 2-Lett.
37
, L923
–L926
(1998
). 10.
J. F.
Ziegler
, M. D.
Ziegler
, and J. P.
Biersack
, “SRIM—The stopping and range of ions in matter (2010)
,” Nucl. Instrum. Methods Phys. Res. B
268
, 1818
–1823
(2010
). 11.
R.
Frentrop
, I.
Subbotin
, F.
Segerink
, R.
Keim
, V.
Tormo-Marquez
, J.
Olivares
, K.
Shcherbachev
, S.
Yakunin
, I.
Makhotkin
, and S. M.
Garcia-Blanco
, “In-depth structural analysis of swift heavy ion irradiation in KY(WO4)2 for the fabrication of planar optical waveguides
,” Opt. Mater. Express
9
, 4796
(2019
). 12.
A.
Redondo-Cubero
, M. J.
Borge
, N.
Gordillo
, P. C.
Gutiérrez
, J.
Olivares
, R.
Pérez Casero
, and M. D.
Ynsa
, “Current status and future developments of the ion beam facility at the centre of micro-analysis of materials in Madrid
,” Eur. Phys. J. Plus
136
, 1
–16
(2021
). 13.
M. T.
Robinson
and O. S.
Oen
, “The channeling of energetic atoms in crystal lattices
,” Appl. Phys. Lett.
2
, 30
–32
(1963
). 14.
S. G.
Blanco
, J. S.
Aitchison
, C.
Hnatovsky
, and R. S.
Taylor
, “Microreflectivity characterization of the two-dimensional refractive index distribution of electron-beam-written optical waveguides in germanium-doped flame-hydrolysis silica
,” Appl. Phys. Lett.
85
, 1314
–1316
(2004
). 15.
J.
Mayer
, L. A.
Giannuzzi
, T.
Kamino
, and J.
Michael
, “TEM sample preparation and FIB-induced damage
,” MRS Bull.
32
, 400
–407
(2007
). 16.
O.
Peña-Rodróguez
, J.
Olivares
, M.
Carrascosa
, Á.
García-Cabañes
, A.
Rivera
, and F.
Agulló-López
, “Optical waveguides fabricated by ion implantation/irradiation: A review optical waveguides fabricated by ion implantation/irradiation: A review,” in Ion Implantation, edited by M. Goorsky (IntechOpen, Rijeka, 2012), Chap. 12.17.
A.
García-Navarro
, J.
Olivares
, G.
García
, F.
Agulló-López
, S.
García-Blanco
, C.
Merchant
, and J. S.
Aitchison
, “Fabrication of optical waveguides in KGW by swift heavy ion beam irradiation
,” Nucl. Instrum. Methods Phys. Res. B
249
, 177
–180
(2006
). 18.
R. N.
Frentrop
, V.
Tormo-Márquez
, J.
Olivares
, and S. M.
García-Blanco
, “High-contrast slab waveguide fabrication in KY(WO4)2 by swift heavy ion irradiation,” Proc. SPIE
10535
, 105350O (2018
).19.
W. L.
Zhu
, K. S.
Wan
, Y. L.
Huang
, X. Q.
Feng
, and G.
Pezzotti
, “Stress dependence of Raman vibrational bands of PbWO4 single crystals
,” Phys. Status Solidi A
203
, 2376
–2385
(2006
). 20.
F. J.
Manjon
, D.
Errandonea
, N.
Garro
, J.
Pellicer-Porres
, J.
Lopez-Solano
, P.
Rodriguez
, S.
Radescu
, A.
Mujica
, and A.
Munoz
, “Lattice dynamics study of scheelite tungstates under high pressure II. PbWO4
,” Phys. Rev. B
74
, 144112
(2006
). 21.
L. J.
Burcham
and I. E.
Wachs
, “Vibrational analysis of the two non-equivalent, tetrahedral tungstate (WO4) units in Ce2(WO4)3 and La2(WO4)3
,” Spectrochim. Acta Part A: Mol. Biomol. Spectrosc.
54
, 1355
–1368
(1998
). 22.
C. I.
van Emmerik
, R.
Frentrop
, M.
Dijkstra
, F.
Segerink
, R.
Kooijman
, M.
Muneeb
, G.
Roelkens
, E.
Ghibaudo
, J.-E.
Broquin
, and S. M.
Garcia-Blanco
, “Heterogeneous integration of KY(WO4)2-on-glass: A bonding study
,” OSA Continuum
2
, 2065
(2019
). © 2021 Author(s). Published under an exclusive license by AIP Publishing.
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