Fiber-optic based material property measurement system and related methods

A method for measuring at least one property of a target material using thermoreflectance, the method comprising:

• generating a pump light beam at a pump wavelength with a pump device;
• generating a modulated pump beam by modulating an amplitude of an intensity of the pump light beam by sweeping between at least a first modulation frequency and a different second modulation frequency;
• directing at least a portion of the modulated pump beam to a manipulation portion of the target material;
• generating a probe beam at a probe wavelength with a probe device;
• directing at least a portion of the probe beam to a probing portion of the target material, wherein at least a part of the portion of the probe beam is reflected off of the target material forming a reflected probe beam, wherein the reflected probe beam has a similar modulated frequency characteristic as the pump beam;
• directing at least a portion of the reflected probe beam to a detection device, wherein the detection devices generates a detection signal from the reflected probe beam;
• and
• analyzing the detection signal with an analyzing device by receiving the detection signal with the analyzing device, and calculating the property of the target material by comparing the modulated frequency characteristics of the reflected probe beam to the modulated frequency characteristics of the pump beam;
• and
• wherein at least one of the pump wavelength and the probe wavelength is an infrared wavelength.