By using cascaded Wavelength Division Multiplexing and pumping in
sectionalization method, ASE and feedback were greatly suppressed. At repetition rate
of 50kHz and pulse duration of 20ns, gain of amplified signal was 17.1dB with a high
signal to noise ratio of 25dB. The whole system is a good choice for a preamplifier of
high-power pulse amplification.
We report on the fiber-based amplification of a commercially packaged, fiber-pigtailed-pulsed diode laser operating at
wavelength of 1064nm (bandwidth 0.45nm). The cascaded Yb-doped fiber amplifier can operate safely by using
cascaded Wavelength division multiplexing (WDM) in each single-mode amplification stage. The total isolation of
cascaded WDM can protect the laser diodes from destroyed by feedback of optical power. At repetition rate of 50kHz,
pulse duration of 20ns, and average power of 0.5mW, output power up to 1.05W And peak power up to 1.05kW are
obtained, with a high signal to noise ratio of 20dB. The whole system is a good choice for a preamplifier of high-power
short-pulse amplification. The aim of the experiment is to study the design of preamplifier for high-power short-pulse
amplifier via cascaded fiber-based amplifier.
We have proposed and successfully demonstrated coherent polarization locking of two orthogonal-polarization
beams in a Mach-Zehnder Erbium-doped fiber laser (MZEDFL) cavity based on the polarization-dependence
losses of a polarizer. The two orthogonal polarizations are locked coherently to produce a
resultant polarization state that sees maximal loss to the polarizer and minimal loss to the output port. High
efficiency of coherent polarization locking of two orthogonal-polarization beams is realized, even when the
powers of the two branch arms are highly imbalanced (19.3/14.8). The coherent output power can range from
45mW to 0.6mW by adjusting the PC with 120 degrees. This outcome shows the range from polarization
locking to polarization unlocking occurring in the 50:50 fused fiber coupler.
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