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Picosecond laser source with single knob adjustable pulse width

The authors describe and demonstrate a system which can be used with many types of actively modelocked lasers to create a source of variable width picosecond pulses. This system is an active compression scheme which incorporates a resonant electro-optic quadratic phase modulator to impart the linear frequency chirp on an optical pulse. To demonstrate, they used the modulator to chirp the 85 ps pulses from a modelocked Nd:YAG laser and subsequently compressed them with a dispersive delay line to less than 6 ps. It is possible with this system to smoothly vary the pulse width from the initial width to the fully compressed width by changing only the RF drive power going to the phase modulator.