Characterizing rock properties with optical energy sources in a wellbore

A method of determining one or more wellbore characteristics, comprising:

• positioning a bottom hole assembly (BHA) on a downhole conveyance at a reservoir rock formation in a wellbore, the BHA comprising:
• a laser head;
• at least one light source emitter;
• and
• a sensing assembly comprising at least one optical receiver;
• operating the laser head to emit a laser beam toward the reservoir rock formation at a fixed frequency;
• operating the at least one light source emitter to emit a light beam toward the reservoir rock formation;
• sensing, with the at least one optical receiver, a reflected laser beam from the reservoir rock formation and a reflected light beam from the reservoir rock formation;
• interfering, with the sensing assembly, the reflected laser beam with the reflected light beam to generate an interferogram;
• generating, with a controller communicably coupled to the sensing assembly, generating at least one speckle interferogram based on the interference between the reflected laser beam and the reflected light beam;
• and
• determining, with the controller, an angular displacement and an axial displacement of the wellbore based on the at least one speckle interferogram.