D2-260 Beat Note Detector

D2-260 beat note detector converts optical beat note to electrical signal for phase locking cw lasers



  • Optical-to-electrical beat note conversion
  • Detect optical beat note
  • Compatible with D2-150 and D2-250 Heterodyne Modules, D2-135-SMA OPLS, and ICE-CP1
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 (Integrated Control Electronics) architecture. 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.

D2-260 High-Speed Detector
Parameter Value
Input Type LC/PC1 multimode fiber or free space
Wavelength Response 671 ≤ λ ≤ 855 nm
Bandwidth 250 MHz to >9.0 GHz
Input Power Range2 50 μW - 1 mW ; 200 μW is optimum
Output Connection SMA
Power Requirements +5 V, GND, 100 mA
Dimensions 1.38 x 1.25 x ~1.7″
Power Cable Order VPN00410 Hirose-to-D Sub 9-pin when powered by D2-005
Order VPN00475 Hirose-to-Hirose when powered by ICE-Box
Specifications subject to change without notice.
1The unit ships with an FC/APC to LC/PC multimode fiber which is compatible with the D2-250 Heterodyne Module.  The output fiber tip is AR coated.
2In the optical beat note.  Since the beat note is delivered through a multi-mode fiber for ease of alignment, the power at the detector is not necessarily the same as the power in the beat note.  Damage may occur to the optical element if >1 mW of overall optical power is delivered to the detector.