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Q-switched mode-locking with acousto-optic modulator in a diode pumped Nd:YVO4 laser

Jan K. Jabczyński, Waldemar Zendzian, and Jacek Kwiatkowski

Open Access Open Access

Abstract

The Q-Switched Mode Locking (QML) regime provides the generation of relatively high peak power picosecond pulses train with energies of a few μJ each in a simple resonator. The fully modulated efficient QML regime was demonstrated in the diode pumped Nd:YVO4 laser. The acousto-optic cell playing a double role of Q-switch and Mode Locker was located near flat output coupler. The two folding mirrors were mounted on the translation stages for matching the resonance frequency of the cavity to the radio frequency of acousto-optic modulator. The QML pulses with envelope durations of 100-150 ns and near 100% modulation depth were observed for wide range of pump powers and repetition rates. Up to 3 W of output average power, 100 μJ of the envelope energy, having approximately 5-8 mode locked pulses were achieved.

©2006 Optical Society of America

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Figures (5)
Fig. 1.
Fig. 1. Schematic of AO-QML laser: LDBS – 20 W laser diode bar with beam shaper made by LIMO, AOM- acousto-optic modulator, M2, M5 – folding mirrors of 1-m radii of curvature, GM– 0.3% Nd:YVO4 crystal of 3×3×10 mm3, M3,M4- flat folding mirrors at translation stages, M6 –flat output coupler (OC), M1 -rear mirror highly reflective at 1064nm and antireflective at 810 nm.

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Fig. 2.
Fig. 2. Oscilloscope traces of RF electric signal at AOM (upper Ch2 trace), optical QML output signal (lower Ch1 trace).

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Fig. 3.
Fig. 3. Output power vs. pump power for several output coupler transmissions; free running regime.

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Fig. 4.
Fig. 4. Output power vs. pump power: diamonds - free running regime, squares - QML regime at 30 kHz repetition rate.

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Fig. 5.
Fig. 5. Oscilloscope trace of fully modulated QML pulse train.

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