Optical parametric waveform synthesizer being configured for creating optical waveforms, comprising - a pump source device being arranged for creating at least one sequence of pump pulses, - a seed source device being arranged for creating a sequence of master seed pulses and at least one sequence of slave seed pulses (2B, 2C), - an optical parametric amplifier device having (a) a master channel with at least one optical parametric amplifier unit (31A, 32A) being arranged for creating a sequence of master channel laser pulses by non-linear optical interactions using one of the at least one sequence of pump pulses and the sequence of master seed pulses, and (b) at least one slave channel (30B, 30C) with at least one optical parametric amplifier unit (31B, 32B, 31C, 32C) being arranged for creating at least one sequence of slave channel laser pulses (3B, 3C) by non-linear optical interactions using one of the at least one sequence of pump pulses and the at least one sequence of slave seed pulses (2B, 2C), wherein - the master channel and the at least one slave channel (30B, 30C) are configured such that the sequence of master channel laser pulses and the at least one sequence of slave channel laser pulses (3B, 3C) have different spectral intensity characteristics, and - a beam combiner device is arranged for coherently combining the master channel laser pulses and the slave channel laser pulses (3B, 3C), thus synthesizing the optical waveforms to be obtained, characterized by - detector devices being arranged for sensing pulse properties of the master seed pulses, the slave seed pulses, the master channel laser pulses and the slave channel laser pulses (3B, 3C), and - a control system being arranged for controlling a carrier-envelope-phase of the master and slave seed pulses and a relative temporal relationship and a relative phase relationship between the master channel laser pulses and the slave channel laser pulses (3B, 3C) on the basis of output signals of the detector devices by an orthogonal control of the seed source device and the optical parametric amplifier device. - a pump source device being arranged for creating at least one sequence of pump pulses, - a seed source device being arranged for creating a sequence of master seed pulses and at least one sequence of slave seed pulses (2B, 2C), - an optical parametric amplifier device having (a) a master channel with at least one optical parametric amplifier unit (31A, 32A) being arranged for creating a sequence of master channel laser pulses by non-linear optical interactions using one of the at least one sequence of pump pulses and the sequence of master seed pulses, and (b) at least one slave channel (30B, 30C) with at least one optical parametric amplifier unit (31B, 32B, 31C, 32C) being arranged for creating at least one sequence of slave channel laser pulses (3B, 3C) by non-linear optical interactions using one of the at least one sequence of pump pulses and the at least one sequence of slave seed pulses (2B, 2C), wherein (a) a master channel with at least one optical parametric amplifier unit (31A, 32A) being arranged for creating a sequence of master channel laser pulses by non-linear optical interactions using one of the at least one sequence of pump pulses and the sequence of master seed pulses, and (b) at least one slave channel (30B, 30C) with at least one optical parametric amplifier unit (31B, 32B, 31C, 32C) being arranged for creating at least one sequence of slave channel laser pulses (3B, 3C) by non-linear optical interactions using one of the at least one sequence of pump pulses and the at least one sequence of slave seed pulses (2B, 2C), wherein - the master channel and the at least one slave channel (30B, 30C) are configured such that the sequence of master channel laser pulses and the at least one sequence of slave channel laser pulses (3B, 3C) have different spectral intensity characteristics, and - a beam combiner device is arranged for coherently combining the master channel laser pulses and the slave channel laser pulses (3B, 3C), thus synthesizing the optical waveforms to be obtained, characterized by - detector devices being arranged for sensing pulse properties of the master seed pulses, the slave seed pulses, the master channel laser pulses and the slave channel laser pulses (3B, 3C), and - a control system being arranged for controlling a carrier-envelope-phase of the master and slave seed pulses and a relative temporal relationship and a relative phase relationship between the master channel laser pulses and the slave channel laser pulses (3B, 3C) on the basis of output signals of the detector devices by an orthogonal control of the seed source device and the optical parametric amplifier device.