The 4461 High-Efficiency Resonant Phase Modulator incorporates a patent-pending design to achieve twice the efficiency over our popular standard designs. This 500-900 nm, KTP, 0.6 to 2.0 GHz modulator has low insertion losses and efficient phase modulation with extremely low unwanted amplitude modulation, this new line of phase modulators is ideal for a wide variety of demanding applications. Using these modulators is easy, simply pass the beam through pre-aligned mechanical apertures for the optimal optical performance. 8-32 and M4 mounting holes.