Abstract:We report herein on
the development of a linearly
polarized, single-frequency tunable laser system producing more than
10 W in the 1550 nm range, using a two-stage erbium/ytterbium co-doped
fiber-based master oscillator power amplifier (MOPA) architecture. The
all-fiber MOPA provides an ultralow intensity noise of
−
160
d
B
c
/
H
z
beyond 200 kHz between 1533 and
1571 nm (
Δ
λ
=
38
n
m
… Show more
“…The discrete noise peaks around 500 kHz are probably caused by the test system. In the frequency range of 1–3 kHz, the large bump of the RIN is caused by ASE [ 30 ] . Notably, this noise bump would not transfer to the amplified output laser due to the low-cutoff behavior for seed noise [ 31 ] . Figure 7 The co-pumped configuration: the RIN of the 1560 nm signal laser and corresponding pump laser at output powers of (a) 32.2 W and (b) 59.1 W. The noise at 657 kHz and the beat noise of the pump laser are transmitted to the signal laser.…”
Section: Resultsmentioning
confidence: 99%
“…The discrete noise peaks around 500 kHz are probably caused by the test system. In the frequency range of 1-3 kHz, the large bump of the RIN is caused by ASE [30] . Notably, this noise bump would not transfer to the amplified output laser due to the low-cutoff behavior for seed noise [31] .…”
High power continuous-wave single frequency Er-doped fiber amplifiers at 1560 nm by in-band and core pumping of a 1480 nm Raman fiber laser are investigated in detail.Both co-and counter-pumping configurations are studied experimentally. Up to 59.1 W output and 90% efficiency were obtained in fundamental mode and linear polarization in the co-pumped case, while less power and efficiency were achieved in the counter-pumped setup for additional loss. The amplifier performs indistinguishably in terms of laser linewidth and relative intensity noise in frequency range up to 10 MHz for both configurations. But the spectral pedestal is raised in co-pumping caused by cross-phase modulation between the pump and signal laser, which is observed and analyzed for the first time. Nevertheless, the spectral pedestal is 34.9 dB below the peak, which has negligible effect for most applications.
“…The discrete noise peaks around 500 kHz are probably caused by the test system. In the frequency range of 1–3 kHz, the large bump of the RIN is caused by ASE [ 30 ] . Notably, this noise bump would not transfer to the amplified output laser due to the low-cutoff behavior for seed noise [ 31 ] . Figure 7 The co-pumped configuration: the RIN of the 1560 nm signal laser and corresponding pump laser at output powers of (a) 32.2 W and (b) 59.1 W. The noise at 657 kHz and the beat noise of the pump laser are transmitted to the signal laser.…”
Section: Resultsmentioning
confidence: 99%
“…The discrete noise peaks around 500 kHz are probably caused by the test system. In the frequency range of 1-3 kHz, the large bump of the RIN is caused by ASE [30] . Notably, this noise bump would not transfer to the amplified output laser due to the low-cutoff behavior for seed noise [31] .…”
High power continuous-wave single frequency Er-doped fiber amplifiers at 1560 nm by in-band and core pumping of a 1480 nm Raman fiber laser are investigated in detail.Both co-and counter-pumping configurations are studied experimentally. Up to 59.1 W output and 90% efficiency were obtained in fundamental mode and linear polarization in the co-pumped case, while less power and efficiency were achieved in the counter-pumped setup for additional loss. The amplifier performs indistinguishably in terms of laser linewidth and relative intensity noise in frequency range up to 10 MHz for both configurations. But the spectral pedestal is raised in co-pumping caused by cross-phase modulation between the pump and signal laser, which is observed and analyzed for the first time. Nevertheless, the spectral pedestal is 34.9 dB below the peak, which has negligible effect for most applications.
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