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Tunable
Harmonics
Generation from
Low Average
Power
Mode-Locked Er-Fiber
Laser Using
Periodic Poling
Nonlinear
Crystals
F. Qamar
Physics
Department,
Faculty of
Sciences,
Damascus
University,
Damascus, Syria.
Corresponding
Author:
Fadi Qamar
Email:
fadiqamar@Hotmail.com
Doi: https://doi.org/10.47011/16.4.8
Cited by :
Jordan J. Phys.,
16 (4) (2023)
457-465
PDF
Received
on:
22/11/2021;
Accepted
on:
20/02/2022
Abstract:
Sufficient
second,
third,
and
fourth
harmonic
generation
of
mode-locked
Er-doped
fiber
laser
(ML -
EDFL)
was
experimentally
demonstrated.
This was
achieved
by using
periodically
poled
KTiOPO4
(PPKTP)
and PP
LiNbO3
(PPLN)
PPLN
nonlinear
crystals.
Harmonic
generation
in both
crystals
depended
on the
direction
of
polarization.
The
highest
conversion
efficiency
was
obtained
by using
a
half-wave
plate to
rotate
the
polarization
before
the
crystals.
When
using
the
PPKTP
nonlinear
crystal,
conversion
efficiencies
of
4.88%,
0.02%,
and
0.002%
were
obtained
for
second,
third,
and
fourth
harmonics
generation
at
wavelengths
of 980,
520, and
390 nm,
respectively.
For the
PPLN
nonlinear
crystal,
temperature
and
polarization
direction
were
optimized
for each
harmonic
generation
wavelength.
As a
result,
conversion
efficiencies
of 8.6%,
0.1%,
and
0.007%
were
obtained
for
second,
third,
and
fourth
harmonic
generation
at the
same
respective
wavelengths.
Tunable
wavelength
ranges
and
their
SHGs, as
well as
the
multi-wavelength
output
and
their
corresponding
SHG
wavelengths,
were
also
reported.
Keywords:
Er-fiber
laser,
Passive
mode-locked
fiber
laser,
Nonlinear
polarization
rotation,
PPKTP,
PPLN,
SHG, THG,
FHG.
PACS:
Fiber
lasers,
42.55.Wd,
Mode
locking,
42.60.Fc.
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