We demonstrate an all fiber high-repetition-rate erbium-doped ultrashort laser based on the Ti3C2T
x
-Mxene saturable absorber (SA), and the 56th harmonic mode-locking with a repetition rate of 622.2 MHz, a central wavelength of 1590.7 nm, and a pulse duration of 1.31 ps is achieved. Meanwhile, dual-wavelength mode-locking pulses are also realized, with the central wavelengths of 1575.6, 1587.5 nm. The results of the work indicate that Ti3C2T
x
-Mxene is an outstanding SA for generating ultrashort pulse or modulating the light and the diversity Mxene family can bring new vigor and vitality into advanced photonic devices.
All-optical modulators based on
M
X
e
n
e
-
T
i
3
C
2
T
x
have recently garnered much attention
due to their broadband light–matter interactions and its ultrafast
carrier dynamics. To investigate the modulation characteristics of
pump intensity and pump light modulation frequency, we establish an
all-optical modulator with a sandwich structure based on
M
X
e
n
e
-
T
i
3
C
2
T
x
/
P
V
A
(polyvinyl alcohol) film. The result
shows that this modulator can achieve a high modulation depth of
12.55 dB and a modulation frequency of 50 kHz corresponding to a
response time at the microsecond scale. The successful preparation of
the modulator is attributed to the saturable absorption
characteristics of the
M
X
e
n
e
-
T
i
3
C
2
T
x
. This modulator has great potential
in all-optical communications and ultrafast optical signal
processing.
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