Optically realized continuously variable true-time delay of microwave pulses is demonstrated in a heterodyne system involving an acousto-optic deflector and a specially designed electro-optic modulator. The system realizes the time delay by frequency dependent phase shifting of the spectral components of the signal (FDPC technique). A new feature of the system is the real continuous variation of the time shift achieved with the continuous frequency dependent phase shift, performed by a specially designed electro-optic modulator. Continuously variable time delay values between ±200 ns are measured.
A novel approach for 1D and 2D acousto-optic deflector design is presented. 2D deflectors are optimally built of two adjacent Bragg cells in acoustically rotated configuration. The depleting effect of second order diffraction is compensated by a small change of the optical incidence angle. High bandwidth devices working below 100 MHz acoustic frequency and 1 W acoustic power are reported. Several experimental results on deflectors for 633 nm and 1064 nm optical wavelengths are presented.
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