We demonstrate a robust linearly polarized 365 W, very low amplitude noise, single frequency master oscillator power amplifier at 1064 nm. Power scaling was done through a custom large mode area fiber with a mode field diameter of 30 µm. No evidence of stimulated Brillouin scattering or modal instabilities are observed. The relative intensity noise is reduced down to −160 dBc/Hz between 2 kHz and 10 kHz via a wide band servo loop (1 MHz bandwidth). We achieve 350 W of isolated power, with a power stability < 0.7% RMS over 1100 hours of continuous operation and a near diffraction limited beam (M 2 < 1.1).
We demonstrate a 17 W single-frequency, low-intensity-noise green source at 532 nm, by single-pass second-harmonic generation of a 50 W continuous-wave fiber laser in a 30 mm MgO-doped periodically-poled stoichiometric lithium tantalate crystal. The maximum conversion efficiency is about 37%. A nearly Gaussian beam (
M
2
<2020
We report on a monolithic narrow spectral linewidth master oscillator power amplifier (MOPA) delivering up to 39 W around 976 nm with very high contrast. The amplifier is based on an ytterbium-doped large mode area (LMA) octagonal double clad (DC) active fiber with parameters optimized for long living three-level operation.
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
) at full output power and a minimum
optical signal to noise ratio of 38 dB. A good stability is obtained
over 4 h at maximum power for several wavelengths with peak-to-peak
fluctuation less than 3% and rms below 0.5%.
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