Laser Processing of Multi-Phase Transparent Materials With Lower Energy

The patent utilizes the local quality differences between phases in multi-phase transparent materials. By exploiting the different dielectric constants of embedded particles versus surrounding material, the laser energy is selectively concentrated at phase interfaces where modifications are desired, rather than uniformly distributing energy throughout the material. This localized energy concentration achieves deeper and more extensive modifications with lower overall energy input.

The patent changes the physical parameters of the laser processing by using ultrashort pulse durations and specific wavelength selections that resonate with or are absorbed differently by the various phases. This parameter optimization allows the laser energy to be more efficiently converted into mechanical or thermal effects at phase boundaries, enhancing modification depth and extent while reducing total energy consumption.

The patent employs periodic ultrashort laser pulses with optimized repetition rates that match the thermal and mechanical relaxation times of the multi-phase material. This periodic action allows cumulative damage accumulation at phase interfaces over multiple pulses, producing longer linear defects and deeper material removal through a cooperative effect that is more efficient than continuous or randomly-timed pulsing.

The patent leverages the composite structure of multi-phase transparent materials themselves, where the embedded particles with different dielectric constants act as natural energy concentrators. This composite structure is exploited to enhance laser processing efficiency, as the phase boundaries naturally guide and concentrate laser energy, reducing the total energy required to achieve extensive modifications compared to homogeneous single-phase materials.

The patent exploits local quality differences between phases to concentrate laser energy at phase interfaces. The embedded particles with different dielectric constants create localized electric field enhancements that concentrate laser energy precisely where modifications are needed, producing more pronounced modifications with lower overall energy input compared to uniform processing of single-phase materials.

The patent optimizes laser parameters including pulse duration, wavelength, and intensity to match the specific optical and physical properties of the multi-phase material's phases. These parameter changes enable more efficient energy transfer and conversion at phase boundaries, resulting in more pronounced modifications with reduced energy consumption.