Enlarged shift of light frequency in a modified Bragg cell

Ultrasonic light interaction in a slightly modified Bragg cell in the form of a truncated pyramid is considered theoretically. It is shown that the duration of the interaction can be increased by a factor of . The ultrasonic wave not only modulates the light wave in space but can also significantly increase its frequency and energy. Properties of moving optical resonators formed by the ultrasonic wave in the cell in relation to its taper and the intensity of the ultrasonic wave, optimal regimes of the interaction, maximally possible frequency shift, physical mechanisms responsible for the frequency shift, and possible generalization of the cell are considered.