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【Ju Han Lee】
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Advanced Imaging
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Lasers and Laser Optics
Investigation of nonlinear optical properties of rhenium diselenide and its application as a femtosecond mode-locker
Download:603次
Jinho Lee
Kyungtaek Lee
Suhyoung Kwon
Bumsoo Shin
Ju Han Lee
*
Author Affiliations
Abstract
School of Electrical and Computer Engineering, University of Seoul, Seoul 02504, South Korea
We investigated the nonlinear optical properties of
ReSe
2
. First, we measured the nonlinear absorption coefficient and the nonlinear refractive index of a
ReSe
2
thin film using open-aperture (OA) and closed-aperture (CA) Z-scan techniques.
ReSe
2
was shown to possess both saturable absorption and self-defocusing properties. The nonlinear absorption coefficient of
ReSe
2
was measured to be
(
5.67
±
0.35
)
×
10
3
cm
/
GW
, and its nonlinear refractive index was
(
2.81
±
0.13
)
×
10
2
cm
2
/
GW
at 1560 nm. Next, a fiberized saturable absorber (SA) based on
ReSe
2
was fabricated with a side-polished fiber platform and was tested as an ultrafast mode-locker capable of producing femtosecond pulses operating at a wavelength of 1560 nm. The estimated modulation depth and saturation power are
~
3.9
%
and
~
42
W
, respectively, for the transverse electric mode, while they are
~
2.4
%
and
~
53
W
for the transverse magnetic mode. Using the prepared SA, stable soliton pulses with a temporal width of
~
862
fs
were produced from an erbium-doped fiber ring cavity. To the best of the authors’ knowledge, this is the first demonstration of using a
ReSe
2
-based SA for femtosecond mode-locked pulse generation.
PDF全文
Full Text
Photonics Research
2019, 7(9): 09000984
Two Dimensional Layered Materials for Ultrafast Lasers (Invitation only)
Femtosecond mode-locking of a fiber laser using a CoSb
3
-skutterudite-based saturable absorber
Jinho Lee
Yoontaek Kim
Kyungtaek Lee
Ju Han Lee
*
Author Affiliations
Abstract
School of Electrical and Computer Engineering, University of Seoul, Seoul 02504, South Korea
We experimentally demonstrate an ultrafast mode-locker based on a
CoSb
3
skutterudite topological insulator for femtosecond mode-locking of a fiber laser. The mode-locker was implemented on a side-polished fiber platform by depositing a
CoSb
3
/
PVA
composite. The measured modulation depth and saturation power for the transverse-electric mode input were
~
5
%
and
~
8.7
W
, respectively, and
~
2.8
%
and
~
10.6
W
for the transverse-magnetic mode input. By incorporating this mode-locker into an erbium-doped fiber-based ring cavity, we were able to readily generate mode-locked, soliton pulses having a pulse width of
~
833
fs
at 1557.9 nm. The 3-dB bandwidth of the output pulses and time-bandwidth product were
~
3.44
and 0.353 nm, respectively. To the best of the authors’ knowledge, this is the first demonstration of the use of a skutterudite-based saturable absorber for femtosecond mode-locked pulse generation.
Lasers, fiber
Mode-locked lasers
Nonlinear optical materials
PDF全文
Full Text
Photonics Research
2018, 6(10): 10000C36
Photonics based on 2D noncarbon materials
Passively
Q
-switched ytterbium-doped fiber laser using the evanescent field interaction with bulk-like WTe
2
particles
Seunghwan Ko
Jinho Lee
Ju Han Lee
*
Author Affiliations
Abstract
School of Electrical and Computer Engineering, University of Seoul, Seoul 02504, Republic of Korea
The potential of bulk-like
WTe
2
particles for the realization of a passive
Q
-switch operating at the 1 μm wavelength was investigated. The
WTe
2
particles were prepared using a simple mechanical exfoliation method together with Scotch tape. By attaching bulk-like
WTe
2
particles, which remained on the top of the sticky surface of a small segment of the Scotch tape, to the flat side of a side-polished fiber, a saturable absorber (SA) was readily implemented. A strong saturable absorption was then readily obtained through an evanescent field interaction with the
WTe
2
particles. The modulation depth of the prepared SA was measured as
~
2.18
%
at 1.03 μm. By incorporating the proposed SA into an all-fiberized ytterbium-doped fiber ring cavity, stable
Q
-switched pulses were readily achieved.
140.3510
Lasers, fiber
140.3540
Lasers, Q-switched
PDF全文
Full Text
Chinese Optics Letters
2018, 16(2): 020017
All-fiber acousto-optic modulator based on a cladding-etched optical fiber for active mode-locking
Download:551次
Jihwan Kim
Joonhoi Koo
Ju Han Lee
*
Author Affiliations
Abstract
School of Electrical and Computer Engineering, University of Seoul, 163 Seoulsiripdae-ro, Dongdaemun-gu, Seoul 02504, South Korea
An all-fiber acousto-optic modulator (AOM), which features a compact structure and a low-driving voltage, is experimentally demonstrated for the active mode-locking of a fiber laser. The proposed AOM is based on the short length of the cladding-etched fiber, the ends of which are fixed on a slide glass. On top of the cladding-etched fiber, a piezoelectric transducer was overlaid. A chemical wet-etching technique, which is based on a mixed solution of NH4F and (NH4)2SO4, is used to reduce the fiber diameter down to ~25 μm, and the length of the etched section is only 0.5 cm. The fabricated device exhibited a modulation depth of 73.10% at an acoustic frequency of 918.9 kHz and a peak-to-peak electrical voltage of 10 V, while a laser beam was coupled at 1560 nm. By using the prepared AOM within an erbium-doped-fiber ring cavity, the mode-locked pulses with a temporal width of 2.66 ps were readily obtained at a repetition rate of 1.838 MHz.
(060.2340) Fiber optics components
(140.4050) Mode-locked lasers
(230.1040) Acousto-optical devices.
PDF全文
Full Text
Photonics Research
2017, 5(5): 05000391
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