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Hybrid ultra-short Yb:YAG ceramic master-oscillator high-power fiber amplifier

Hui Zhou, Wenxue Li, Kangwen Yang, Niannian Lin, Benxue Jiang, Yubai Pan, and Heping Zeng

Open Access Open Access

Abstract

We demonstrated a hybrid ceramic master-oscillator high-power fiber amplifier with a diode-pumped Yb:YAG ceramic laser as the seeding oscillator, which was passively mode-locked at 103.29 MHz repetition rate around 1031 nm by using a semiconductor saturable absorption mirror, and a two-stage double-clad photonic crystal fiber amplifier, which power-scaled the ceramic laser oscillator up to an average power of 303 W. The amplified pulses were further compressed to 237 and 418 fs at 50 and 150 W output powers, respectively. The compressed pulses exhibited about 0.05% deviation from the Gaussian fit, implying that the high-power fiber amplification induced neither observable temporal and spectral distortion nor significant nonlinear de-chirping of the chirped pulses.

©2012 Optical Society of America

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Figures (4)
Fig. 1
Fig. 1 (a)The laser tunable range of 5 at.% Yb:YAG ceramic pumped by 976 nm diode laser. Inset, setup of the three-mirror laser cavity. Inset, OC: output coupler. (b) Schematic of the energy diagram of Yb3+ion in Yb:YAG.

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Fig. 2
Fig. 2 Experimental setup for the MOPA system. M1, M2, M3: mirrors. LD: diode laser. DM1 and DM2: dichroic mirrors (HT@976 nm & HR@1020-1120 nm). OC: output coupler. OI: optical isolator. HWP: half-wave plate. Col: collimator. SMF: single-mode fiber. PCF: photonic crystal fiber.

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Fig. 3
Fig. 3 (a) Pulse train of the mode-locked Yb:YAG ceramic laser. (b) Power spectrum of the mode-locked Yb:YAG laser. (c) The standard deviations of the mode-locked Yb:YAG ceramic laser pulses. (d) Measured autocorrelation trace and the gauss fitting of the mode-locked Yb:YAG ceramic laser pulses.

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Fig. 4
Fig. 4 (a) Spectra of the output pulses from the ceramic laser oscillator, after the SMF, and from the power amplifier. SMF, single-mode fiber. (b) Output characteristics of the ytterbium-doped ðber power ampliðer. (c) Measured autocorrelation for the 30-W and 150-W pulses.

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