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Adaptive pulse shape control in a diode-seeded nanosecond fiber MOPA system

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Abstract

We demonstrate active shaping of the driving electrical pulses to a laser diode in order to compensate for the pulse shaping effects of gain saturation in an Yb doped fiber amplifier cascade and to allow the generation of user defined customized output pulse shapes. In particular we demonstrate the generation of square output pulses, which have the potential to significantly increase the maximum pulse energy extractable from an amplifier before the peak power reaches the threshold for SRS, and for high efficiency frequency conversion.

©2006 Optical Society of America

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Figures (4)

Fig. 1.
Fig. 1. Schematic of active pulse shaping system
Fig. 2.
Fig. 2. (a) square signal from AWG and corresponding optical output of diode, (b) corresponding optical output from MOPA at various pump power levels. The ringing on the pulse is due to non-ideal impedance matching of the current driver and laser and could be largely eliminated with improved design.
Fig.3.
Fig.3. (a) input electrical signal (dotted) and diode output pulses, (b) target pulse (dotted) and MOPA output (solid), comparison pulses (dashed) produced with square driving pulse.
Fig. 4.
Fig. 4. Applied signal (dotted), diode output (solid green), target pulses (dashed) and MOPA output (solid blue) for triangular and 2-step pulses

Equations (1)

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y = L + 1 L e α T ( e α ( t T ) 1 )
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