Damage threshold of monocrystalline silicon irradiated by a millisecond pulsed laser

The laser damage threshold is an important index to describe the laser shock and protection. In order to determine the cleavage and the melting damage threshold of monocrystalline silicon irradiated by a millisecond pulsed laser, a temperature measurement system with a high-precision point thermometer was built. Based on the optical interference theory and on the Mach-Zehnder interference system, a real-time measurement method to determine the stress and the strain of millisecond pulsed lasers interacting with monocrystalline silicon was studied. The research results indicate that the covalent bond fracture damage of the monocrystalline silicon occurs initially under the action of the …