Generation of Identical Femtosecond Pulses with Adjustable Carrier-Envelope Phase

Summary form only given. The phase shift between the carrier and the envelope of femtosecond pulse significantly affects nonlinear optical processes, such as the generation of attosecond pulses [1]. The use of a heterodyne laser, whose frequency matched with the low-frequency range of the femtosecond laseremission spectrum, and its second harmonic, coincided with the high-frequencyone, made it possible to eliminate the offset of its frequency comb [2]. Same result was achieved with the use of an acousto-optic modulator [3]. In both cases, the phase shift between the envelope and the carrier has an arbitrary uncontrolled value. In this paper, a method is proposed for creating femtosecond radiation without frequency comb offset when generating a synthesized pulse train with an adjustable carrier-envelope phase.