Laser welding coated substrates

A method of laser bonding a multi-layer film to a substrate, the method comprising:

• forming a film over a first surface of a first substrate that is transmissive to light at a first wavelength, wherein the film comprises:
• a reflective layer that is reflective to light at the first wavelength;
• and
• a refractive layer that is refractive to light at the first wavelength;
• and
• irradiating a region of the film using laser radiation passing through the first substrate, wherein a wavelength profile of the laser radiation has a peak at about the first wavelength, and the refractive layer, in combination with the reflective layer, reduces reflection of the laser radiation at the first wavelength relative to the reflective layer alone;
• wherein the first wavelength is between about 300 nm and about 5000 nm.