Mingchen Chen

167 W, power scalable ytterbium-doped photonic bandgap fiber amplifier at 1178nm

An ytterbium-doped photonic bandgap fiber amplifier operating at the long wavelength edge of the ytterbium gain band is investigated for high power amplification. The spectral filtering effect of the photonic bandgap efficiently suppresses amplified spontaneous emission at the conventional ytterbium gain wavelengths and thus enables high power amplification at 1178 nm. A record output power of 167 W, a slope efficiency of 61% and 15 dB saturated gain at 1178 nm have been demonstrated using the ytterbium-doped photonic bandgap fiber.

Single-frequency ytterbium doped photonic bandgap fiber amplifier at 1178 nm

1178 nm single-frequency amplification by Yb doped photonic bandgap fiber has been demonstrated. 24.6 W output power and 12 dB gain were obtained without parasitic lasing and also stimulated Brillouin scattering. 1.8 dB suppression of Brillouin gain by an acoustic antiguiding effect has been found in the Yb doped photonic bandgap fiber.

87 W, narrow-linewidth, linearly-polarized 1178 nm photonic bandgap fiber amplifier.

High-power narrow-linewidth photonic bandgap fiber amplifier was demonstrated. In order to suppress stimulated Brillouin scattering, the seed linewidth was broadened by applying a random phase noise with an electro-optical modulator. A factor of 15 in terms of Brillouin gain suppression can be theoretically expected. An 87 W linearly-polarized (11 dB PER) and narrow-linewidth (780 MHz FWHM) output was obtained.

High-peak power pulse amplification by SRS-suppressed photonic bandgap fiber

We report Yb-doped photonic bandgap fiber amplifier generating 19 kW nanosecond pulses without stimulated Raman scattering by long-wavelength cut distributed filtering. Modulation instability due to the huge anomalous waveguide dispersion around the cutoff was observed.

Single-frequency 1178nm SDL/Yb-PBGF MOPA with an output power of 31 W

We report on the use of a Semiconductor Disk Laser (SDL) as a seed laser for an Ytterbium-Doped Photonic Bandgap Fiber (Yb-PBGF) amplifier in a Master-Oscillator Power-Amplifier (MOPA) configuration. The SDL comprised a GaInAs/GaAs/GaAsP gain chip, a 1-mm-thick etalon for mode selection, and a 3-mm-thick birefringent filter for wavelength tuning. The fiber amplifier consisted of an Yb-doped core surrounded by a structure of periodically arranged germanium rods with a pitch of 10.2 μm, and to maintain the polarization, the fiber comprised two boron rods. The output of the MOPA-configuration was 31 W and the linewidth of the amplifier output was 149±31 kHz.

High-power Single-Frequency Fiber MOPA Based on FRA and PBGF Amplifier at 1178 nm

87 W CW single-frequency lineally-polarized signal amplification was obtained in a photonic bandgap fiber amplifier with suppressing SBS by linewidth broadening. The broadening was obtained via a phase modulator driven by a white Gaussian noise.

High power 1178 nm single-frequency MOPA based on OP-SDL and PBGF

We report a high power single-frequency 1178 nm laser combining an optically-pumped semiconductor disk laser and an Yb-doped photonic bandgap fiber amplifier. An output power of 31 W with <;200 kHz linewidth without SBS was demonstrated.

98 W 1178 nm Yb-doped solid-core photonic bandgap fiber oscillator

A high power 1178nm Yb-doped photonic bandgap fiber laser is reported. A fiber Bragg grating and a Fresnel fiber end construct the resonator. 98W output power and 54% slope efficiency are achieved without parasitic lasing.