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1-mJ energy, 1-MW peak-power, 10-W average-power, spectrally narrow, diffraction-limited pulses from a photonic-crystal fiber amplifier

Christopher D. Brooks and Fabio Di Teodoro

Open Access Open Access

Abstract

We report on a diode-pumped master-oscillator/fiber-amplifier (MOFA) system consisting of a passively Q-switched, single-frequency Nd:LSB microchip laser that seeds a dual-stage Yb-doped fiber amplifier. A large-core, single-mode photonic crystal fiber was used for the final amplifier. The MOFA generated 1062nm wavelength, 1-ns long, ~10kHz repetition-rate, diffraction-limited pulses of energy >1mJ, peak power >1MW, average power >10W, and spectral linewidth ~9 GHz.

©2005 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Architecture of master-oscillator/fiber-amplifier system. MO: Master oscillator; OI: Optical isolator; L: Lens; YDF: Yb-doped fiber; LPF: Dichroic long-pass filter (~98% transmission at 1062, ~98% reflection at 976nm); BPF: Optical band-pass filter (600pm bandwidth, >50dB out-of-band rejection); PCF: Yb-doped photonic-crystal fiber.

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Fig. 2.
Fig. 2. PCF-amplifier pulse energy and average power vs. launched pump power. Dashed line: Linear fit. Inset: Pulse temporal profile at 1.05mJ pulse energy.

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Fig. 3.
Fig. 3. Solid triangles and hollow circles: Beam radius measured along perpendicular directions (Rx and Ry, respectively) as a function of distance z from waist location. Solid lines: Fit to the expression Rx,y = w{1+[M2λz/(πw2)]2}0.5, where λ is the wavelength and w is the radius of the beam at waist.

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Fig. 4.
Fig. 4. Peak-normalized spectrum of PCF amplifier output at 1.05mJ pulse energy. Inset: High-resolution scan of the signal spectrum vs. frequency shift from the peak.

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