The Vescent Photonics D2-260 high-speed detector has a full 9 GHz bandwidth for capturing beat notes between lasers of different frequencies. Simply overlap the master and slave lasers and launch them into the included multimode fiber for measuring the relative frequencies of the two lasers. The D2-260 is compatible with both the Vescent D2-250 Heterodyne Module and the D2-135 Offset Phase Lock Servo. In combination, a true phase lock between a pair of lasers, with a user-defined, high-precision frequency offset, can be established. The D2-260 is also compatible with the new ICE^TM (Integrated Control Electronics) architecture. The D2-260 can also capture fast rising edges of laser pulses for timing, triggering, and pulse synchronization.This digitizing high-speed pre-amplified detector converts an oscillating optical signal (a beat note) into and electrical high/low signal. It works great for measuring beat note frequencies or high-speed timing. It is not suitable for measuring optical power or other amplitude characteristics due to the digitized output.