Method and apparatus for analyzing subsurfaces of a target material

A method, comprising:

• receiving from a device a portion of a first light signal reflected from a subsurface of a target, wherein the device coaxially aligns the first light signal and a second light signal and maintains a first focal point of the first light signal in at least a proximate location of a second focal point of the second light signal;
• directing the device to perform a focal point adjustment of the first focal point or the second focal point, wherein the device maintains the first focal point at the proximate location of the second focal point after the focal point adjustment;
• receiving from the device an updated instance of the first light signal reflected from the subsurface of the target responsive to the focal point adjustment;
• and
• producing from the updated instance of the first light signal an output for analyzing the subsurface.

A non-transitory machine-readable storage device, comprising instructions, which when executed by a processor, cause the processor to perform operations comprising:

• receiving a first light signal reflected from a subsurface of a target, wherein an optical component coaxially aligns the first light signal with a second light signal, and wherein a relative position of the optical component to a first light source of the first light signal and a second light source of the second light signal provides a first focal point of the first light signal to be in a proximate location of a second focal point of the second light signal;
• performing a focal point adjustment of the first focal point or the second focal point, wherein the relative position of the optical component maintains the first focal point at the proximate location of the second focal point after the focal point adjustment;
• receiving from the optical component an updated instance of the first light signal reflected from the subsurface of the target responsive to the focal point adjustment;
• and
• producing from the updated instance of the first light signal an image relating to the subsurface.