3 GHz Bandwidth Bragg Cells

High-Overtone Bulk Acoustic Resonator

“…Moreover, its application for transferring single crystal Lithium Niobate thin layer into silicon proved to be effective for SAW device development [13]. As this technology requires a severe know-how and complex technological facilities and environment, an alternative fabrication technique based on metal diffusion at the interface between the materials to be bonded together [14] has been developed together with a lapping/polishing technique for HBAR manufacturing [15]. In this particular approach, contrary to the sputtering method, thermal process forbids to stack materials presenting notably differential thermal expansion coefficients.…”

“…Although marginal, their application has been mainly focused on filters and frequency stabilization (oscillator) purposes [7], but the demonstration of their effective implementation for sensor applications has been achieved recently [8]. These devices maximize the Q factor that can be obtained at room temperature using elastic waves, yielding quality factor times Frequency products (Q.f) close or slightly above 10 14 , i.e. effective Q factors of about 10,000 at 1GHz in theory (practically, Q factors in excess of 50,000 between 1.5 and 2GHz were experimentally achieved [9]) HBAR-based sensors exploit two principal features yielding notable differences with other sensing solutions.…”

Advanced multi-channel Bragg cells for 2D interferometric phase-frequency measurements

“…IC, expj2~yi(sinp~+sine/hc.a)l2 ( 5 ) which means that the interference pattern is shifted along the p angle versus the variation of 0 by a scale factor S:…”