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首页Tm掺杂光纤激光驱动的高效高能Ho:YAG振荡器研究
Tm掺杂光纤激光驱动的高效高能Ho:YAG振荡器研究
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更新于2024-08-27
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本文主要探讨了一种高功率、高能量的掺铒光纤激光器(Tm-doped fiber laser)驱动的钬掺杂yttrium aluminum garnet (Ho:YAG) 振荡器的设计与实现。这项研究在激光技术领域具有重要意义,因为它展示了在高效率和输出性能上的突破。 首先,研究团队实现了高达38瓦的连续输出功率,这一结果表明了系统的高效能,其斜率效率达到了51.9%,这在同类激光系统中是一个显著的进步。工作波长被稳定地控制在2.09微米,这对于特定应用如材料加工、医疗治疗和光纤通信等领域具有很高的实用性。 更令人瞩目的是,在脉冲模式下,该振荡器能够产生高达12.8毫焦耳的脉冲能量,峰值功率达到惊人的514.5千瓦,这对于短脉冲激光源来说,是相当高的输出能力。脉冲重复频率设为1千赫兹,这使得系统在保持高能量的同时,也具备较高的脉冲密度,为瞬时能量传输和非线性效应提供了可能。 文章还深入研究了系统中的热透镜效应,这是高功率激光器普遍面临的问题。通过理论分析,研究人员给出了不同泵浦功率下激光晶体的横截面电磁场TEM00模式的半径,这有助于优化系统的光束质量并减少潜在的光学畸变。 此外,文章的关键词“论文”表明,这项研究不仅是技术成果,也是对高功率Ho:YAG激光器设计方法和性能优化的一次严谨学术报告。它为激光技术的发展提供了一个重要的参考案例,特别是在提高光纤激光器泵浦效率、脉冲性能和系统稳定性方面。 这篇论文展示了利用Tm-doped fiber laser作为泵浦源的Ho:YAG振荡器在高功率、高能量输出方面的创新技术,对于推动激光技术在精密测量、材料处理等领域的应用具有实际价值。
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High-power, high-energy Ho:YAG oscillator pumped
by a Tm-doped fiber laser
Encai Ji (吉恩才), Qiang Liu (柳 强)*, Zhenyue Hu (胡震岳), Ping Yan (闫 平),
and Mali Gong (巩马理)
Department of Precision Instrument, State Key Laboratory of Precision Measurement Technology and Instruments,
Center for Photonics and Electronics, Tsinghua University, Beijing 100084, China
*Corresponding author: qiangliu@mail.tsinghua.edu.cn
Received August 11, 2015; accepted October 27, 2015; posted online December 7, 2015
A high-power, high-energy Ho:YAG oscillator resonantly pumped by a Tm-doped fiber laser is presented. A
maximum continuous output power of 38 W with a slope efficiency of 51.9% is achieved at the wavelength
of 2.09 μm, and M
2
≈ 1.48. In the Q-switching regime, the maximum pulse energy of 12.8 mJ, corresponding
to a 514.5 kW peak power, is obtained at the pulse repetition frequency of 1 kHz. Furthermore, the thermal lens
effect of the system is studied theoretically, and the radius of the transverse electromagnetic (TEM
00
) mode of
the laser crystal under different pump powers is given.
OCIS codes: 140.3540, 140.3580, 140.5680.
doi: 10.3788/COL201513.121402.
Lasers operating on the 2 μm wavelength range, due to the
low attenuation in the atmosphere and their “eye-safety”
aspects, are extremely useful for a variety of scientific and
technical applications, such as lidar systems, spectros-
copy, range finders, countermeasures, and the non-linear
optical generation of mid-infrared radiation
[1–3]
.At
present, 2 μm lasers based on thulium (Tm
3þ
) and hol-
mium (Ho
3þ
) have attracted great interest in recent years.
They are the best choice to get to the shorter wavelength
region (1.85–2.05 μm) for Tm
3þ
-doped lasers operating on
the
3
F
4
→
3
H
6
transitions pumped directly into
3
H
4
level
by laser diodes (LDs) at 790 nm
[4]
. However, for longer
(λ > 2.05 μm) wavelengths, lasing on
5
I
7
→
5
I
8
transi-
tions in Ho
3þ
-doped media is required. YAG, YALO,
YVO4, LLF, YLF, BYF, and Lu
2
O
3
crystals are all effi-
cient laser hosts for 2 μm generation
[5–8]
. Additionally,
YAG- and LuAG-based transparent ceramics are also
competitive with their corresponding single crystals
[9,10]
.
In general, the Ho:YAG crystal is more attractive for a
high-power or high-energy laser due to its large thermal
conductivity, hardness, reliable optical quality, and low
cost. Recently, high-power 1.9 μm LDs were developed
rapidly, and applied successfully in pumping various hol-
mium crystals
[8,11,12]
. However, the low spectral brightness
and bad beam quality have affected their applications,
especially for developing high-power holmium lasers. So,
high-power 1.9 μm lasers are mostly built with Tm
3þ
-
doped gain elements. Although co-doping with Tm
3þ
is
a feasible solution
[13,14]
, it leads to very strong cooperative
upconversion losses and hence a significant reduction in
the effective upper level lifetime and increase d thermal
loading
[15]
.AHo
3þ
-doped crystal resonantly pumped by
a 1.91 μmTm
3þ
laser can solve the above difficulties.
Recently, high-power Tm-doped fiber lasers (TDFLs)
have been widely used as the pump source, mostly because
they can distribute the thermal load over a much larger
length than the bulk Tm lasers, thus making heat removal
less critical.
For 2.1 μm continuous wave (CW) Ho:YAG lasers
pumped by TDFLs, in 2010, Mu et al.
[16]
reported 18.6 W
of output power with an optical-to-optical efficiency of
78.5%. The system has much lower output power but
higher efficiency compared with the 111 W Ho:YAG laser
system pumped by a Tm:YLF laser
[17]
and the 55 W Ho:
YAG laser system pumped by a GaSb diode stack
[18]
that
was used in 2012. As for 2.1 μ m pulsed holmium laser
pumped by a TDFL, about 2.8 mJ of pulse energy at
5 kHz was obtained by Mu et al.
[16]
. In 2011, 125 mJ at
100 Hz was reported through a master oscillator power
amplifier (MOPA) system
[19]
. In 2013, Fonnum et al.
[20]
ob-
tained the highest pulse energy thus far of 550 mJ at 1 Hz
with a Ho:YLF crystal. In contrast, little work has been
done on the high-energy results at a high pulse repetition
frequency (PRF). In 2013, 11 mJ at 1 kHz was reported
with a TDFL-pumped Ho:LL F MOPA system
[21]
. In 2013,
30 mJ at 1 kHz was reported in a Ho:YAG MOPA system
with a Tm:YLF pump source by Yu et al.
[22]
, and the pulse
energy was enhanced to about 52 mJ in 2014
[23]
. Therefore,
our main task is to develop a high-energy, high-PRF
TDFL-pumped Ho:YAG laser system.
In this Letter, a high-power Ho:YAG oscillator pumped
by a homemade TDFL is described, demonstrating its
pulse characteristics at a high PRF. Its thermal character-
istics were theoretically studied. In the CW regime, the
maximum output power of 38 W at 2.09 μm was obtained,
which is limited by the thermal lens effect. In the pulsed
regime, with a relative high PRF of 1 kHz, the maximum
pulse energy of 12.8 mJ at 2.09 μm was achieved when the
corresponding CW output power was 17.6 W, but it was
limited by the mirror coating damage.
A schematic diagram of the experimental setup is shown
in Fig.
1. The 1.91 μm pump source is self-developed by a
COL 13(12), 121402(2015) CHINESE OPTICS LETTERS December 10, 2015
1671-7694/2015/121402(5) 121402-1 © 2015 Chinese Optics Letters
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