Tunable optical filter
Ondax

Volume Holographic Gratings (VHG's) provide the capability of narrowing and stabilizing the wavelength of semiconductor lasers by forming an external cavity laser (ECL). The standard configuration of these ECL's is to use a collimating lens followed by the VHG to provide feedback to the resonator and lock the wavelength. In this configuration both elements have to be carefully aligned.

This product line integrates the VHG in a fast-axis collimation lens (FAC). Besides the advantage of having a single element, the integrated element is also less sensitive to alignment tolerances.

Features
One single element
Intrinsic wavelength stabilization
Simple alignment
Insensitive to simple of diode laser
Reduces thermal dependence of lasers
Narrow linewidth <0.1nm
Locks at one wavelength
Improves diode yield
High stability and reliability
Custom wavelengths available