The invention provides high speed, low cost scanning suitable for time domain OCT systems. According to the preferred embodiment, the apparatus includes a piezo scanning device and partial reflecting surfaces that simultaneously generate two sets of multiple reference signals at two different wavelengths that can span different regions of a target enabling acquiring target information from a large range within the target. In one embodiment of the invention, information from both the front region and the back region of an eye is acquired in a coordinated manner.
Dual wavelength scanning system