Nd3+：Sr6YSc(BO3)6晶体的性能研究
需积分: 5 49 浏览量
更新于2024-08-12
收藏 1.35MB PDF 举报
"Nd3 +：Sr6YSc（BO3）6晶体的力学，热学和光谱特性"
本文是一篇研究论文，主要探讨了Nd3+掺杂的Sr6YSc(BO3)6晶体的力学、热学以及光谱特性。这种晶体通过顶部籽晶溶液生长法成功合成。在激光晶体领域，这些特性对于评估材料的性能和潜在应用至关重要。
Nd3+:Sr6YSc(BO3)6晶体的力学特性方面，研究者测得其(100)面和(001)面的平均维氏硬度分别为629 N/mm²和545 N/mm²。这一结果表明该晶体具有较好的硬度，能够在一定程度上抵抗机械损伤，这对于激光工作介质来说是必要的，因为它们通常需要承受高能量激光诱导的机械压力。
在热学特性上，沿a轴的线性热膨胀系数为12.3 × 10^-6 K^-1。这意味着随着温度变化，晶体的尺寸会以这个速率线性膨胀。了解这一参数对于设计激光器的冷却系统和避免因热应力导致的损伤至关重要。此外，未提供具体数值的热导率和比热容等其他热学参数也是评估晶体热稳定性的关键因素。
光谱特性部分，尽管文章没有详细给出，但可以推测Nd3+离子在晶体中的光谱性质对激光操作至关重要。Nd3+离子的能级结构通常包括多个激发态和基态，这些能级之间的跃迁决定了晶体的吸收和发射谱。Nd3+离子的914nm和1064nm的吸收峰是其作为激光材料广泛应用的原因，因为这两个波长适合于激光放大和脉冲激光操作。
Nd3+:Sr6YSc(BO3)6晶体的激光诱导损伤阈值被测量为1.76 GW/cm² (对于(001)面)和1.47 GW/cm² (对于(100)面)，在1064nm辐射下。这个指标反映了晶体在高功率激光照射下抵抗损伤的能力，较高的阈值意味着晶体可以承受更大的激光功率而不受损。
Nd3+:Sr6YSc(BO3)6晶体因其优良的力学、热学和初步显示出的光学特性，有望成为高性能激光器的候选材料。然而，为了全面评估其性能，还需进一步研究其光学增益、非线性光学特性以及长期稳定性等关键参数。
Mechanical, thermal and spectral characteristics of Nd
3+
:Sr
6
YSc(BO
3
)
6
crystal
Feifei Yuan
a
, Wang Zhao
b
, Shijia Sun
a
, Lizhen Zhang
a
, Yisheng Huang
a
, Zhoubin Lin
a,
⇑
a
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 350002 Fuzhou, China
b
Anhui Key Laboratory of Low Temperature Co-fired Materials, Department of Physics, Huainan Normal University, 232038 Huainan, China
article info
Article history:
Received 10 October 2014
Received in revised form 16 January 2015
Accepted 17 January 2015
Available online 9 March 2015
Keywords:
Laser crystal
Crystal growth
Thermal characteristics
Spectral properties
Nd
3+
:Sr
6
YSc(BO
3
)
6
crystal
abstract
A crystal of Nd
3+
:Sr
6
YSc(BO
3
)
6
was grown successfully by the top-seeded solution growth method. The
average laser-induced damage thresholds are 1.76 GW/cm
2
for (0 01) face and 1.47 GW/cm
2
for (1 00)
face at 1064 nm radiation, respectively. The average Vickers hardness of (1 00) and (0 0 1) faces are 629
and 545 N/mm
2
, respectively. The thermal expansion coefficients are 12.3 10
6
K
1
along a-axis and
9.39 10
6
K
1
along c-axis, respectively. The thermal conductivity is about 2.3 W/m K at room
temperature. The polarized spectral properties were investigated in detail. Based on the Judd–Ofelt
theory, the intensity parameters were obtained. The results show that Nd
3+
:Sr
6
YSc(BO
3
)
6
crystal is a
potential laser crystal.
Ó 2015 Elsevier B.V. All rights reserved.
1. Introduction
With the rapid development of diode-pumped solid-state
lasers, research on high efficient diode-pumped materials become
more and more important. Nd
3+
:YAG and Nd
3+
:YVO
4
are commer-
cially available laser crystals, but limited to low Nd
3+
(1 at.%)
doping concentration and narrow absorption bands near the diode
output wavelength of 808 nm.
The borate crystals are a type of excellent laser gain media
[1–6], most of them have good spectral and thermal properties.
Sr
3
Y(BO
3
)
3
crystal is one of them, it is isostructural with
Sr
3
Sc(BO
3
)
3
, which crystallizes in the R
3 (No. 148) structure [7].
The Yb-doped Sr
3
Y(BO
3
)
3
crystal has broad emission bandwidth,
in the actual state of the art, one of the broadest for an Yb-doped
crystal. A 69 femtosecond pulse laser with 80 mW average power
had been produced [2]. But a drawback with the Yb:Sr
3
Y(BO
3
)
3
crystal is its brittleness, which limited it’s application. The Stack
family with formula A
6
MM
0
(BO
3
)
6
, where A = Sr, Ba, Pb, or Ln
(lanthanide) and M, M
0
= +2, +3, or +4 metal cations belongs to
the trigonal system with space group R
3, is derived from the struc-
ture of the compound Sr
3
Sc(BO
3
)
3
. Its structure can be simply
described as: the metal-centered octahedra (MO
6
and M
0
O
6
) linked
by BO
3
groups to form chains, these chains are connected together
by the 9-coordinate Sr atoms to form a 3D framework. The MO
6
octahedron is larger and trigonally elongated and shares vertexes
with the 9-fold site, while the M
0
O
6
is trigonally compressed and
shares its triangular faces with the 9-fold site. When A = Sr atom,
M=M
0
= Sc atom, A
6
MM
0
(BO
3
)
6
corresponds to Sr
3
Sc(BO
3
)
3
com-
pound, on the other hand, when M = Y and M
0
= Sc, Sr
6
YSc(BO
3
)
6
compound is formed [8–10].InA
6
MM
0
(BO
3
)
6
compounds, the large
ion usually occupies the M site, whereas the small ion prefers to
occupy the M
0
position. However, in some cases, they can statisti-
cally occupy the same site, which leads to a partial disordered
structure. For example, in Sr
6
HoSc(BO
3
)
6
, the occupancy of M site
is 89% Ho and 11% Sc atoms, whereas the occupancy of M’ site is
93% Sc and 7% Ho atoms [8]. It is generally believed that the disor-
dered structure would result in the broad absorption and emission
bandwidth of laser crystals, which will beneficial to diode pumping
and production of ultrashort pulses. Moreover, as the ionic radius
of Sc
3+
is about 20% smaller that that of Y
3+
, which will make the
crystal structure of Sr
6
YSc(BO
3
)
6
more compact than that of
Sr
3
Y(BO
3
)
3
, this may improve the thermal and mechanical strength
of the material.
Nd
3+
doped Sr
6
YSc(BO
3
)
6
crystal had been grown by the
Czochralski method [11]. However, the thermal properties and
polarized spectroscopic characteristics of the crystal have not been
investigated, and they are very important for evaluating laser
performances and designing of laser device. Therefore, in this paper,
we report the growth, mechanical, thermal and polarized
spectroscopic characteristics of Nd
3+
:Sr
6
YSc(BO
3
)
6
crystal.
http://dx.doi.org/10.1016/j.optmat.2015.01.049
0925-3467/Ó 2015 Elsevier B.V. All rights reserved.
⇑
Corresponding author. Tel.: +86 591 83711451; fax: +86 591 83714636.
E-mail address: lzb@fjirsm.ac.cn (Z. Lin).
Optical Materials 43 (2015) 66–70
Contents lists available at ScienceDirect
Optical Materials
journal homepage: www.elsevier.com/locate/optmat
下载后可阅读完整内容，剩余4页未读，立即下载
2021-02-07 上传
点击了解资源详情
2021-05-15 上传
2021-03-04 上传
2024-10-06 上传
2021-03-08 上传
2021-03-31 上传
2013-03-26 上传
weixin_38748207
- 粉丝: 7
- 资源: 917
我的内容管理
展开
