Ultrasonic Spray Pulse Compression Grating Coating

Ultrasonic Spray Pulse Compression Grating Coating – Cheersonic

In the current era of rapid development of ultra short pulse laser technology, chirped pulse amplification (CPA) technology has become the core support for breaking through laser power limitations, and pulse compression gratings, as the “heart component” of this technology, directly determine the output performance of picosecond and femtosecond lasers. Among them, the diffraction efficiency of the grating and the laser damage threshold are two key indicators, and their performance not only affects the utilization rate of laser energy, but also relates to the stable operation and service life of the laser. Especially in the field of ultra short pulse lasers, when the output power reaches the level of pulse compression, the performance requirements for pulse compression gratings have been raised to a whole new height. Ordinary commercial gratings are difficult to meet practical application needs in terms of size, efficiency uniformity, and damage threshold.

In the traditional grating preparation process, problems such as uneven thickness and particle agglomeration are prone to occur in the coating process, resulting in poor consistency of the microstructure on the grating surface and causing fluctuations in diffraction efficiency. This non-uniformity is more prominent in the preparation of large-sized gratings, with diffraction efficiency in some areas being less than 90%, which is far from the high consistency requirements required for core applications. The demand for gratings in ultra strong and ultra short pulse laser systems has long shifted from “meeting basic needs” to “comprehensive performance breakthroughs with high uniformity, large size, and high stability”, which is driving the innovation of preparation technology.

The introduction of ultrasonic spraying technology provides an effective solution to the problem of uniform grating diffraction efficiency. This technology uses ultrasonic vibration to form micrometer sized uniform droplets on the coating material, combined with precise airflow control and motion platform, to achieve uniform deposition of the coating on the grating substrate surface. Compared with traditional spraying, ultrasonic spraying avoids coating accumulation or vacancy caused by airflow disturbance, and the deviation of droplet diameter distribution is controlled within 5%. The coating thickness error can be reduced to ± 0.1 microns, fundamentally ensuring the consistency of the grating groove structure.

In the actual preparation process, ultrasonic spraying technology can accurately match the microstructure requirements of the grating. By adjusting the spraying pressure, frequency, and speed parameters, the coating material can perfectly fill the grooves and form a flat surface. This refined control not only improves the diffraction efficiency of the grating, but also achieves a qualitative leap in efficiency uniformity – in the preparation of meter sized gratings, the fluctuation of diffraction efficiency in the entire area can be achieved with less than 2%, and the average diffraction efficiency can reach 97% stably. At the same time, the uniform coating structure reduces the energy concentration points during laser irradiation, indirectly increasing the laser damage threshold of the grating, enabling the product to adapt to long-term exposure to ultra strong lasers.

The dual breakthrough of meter scale size and 97% average diffraction efficiency not only breaks the limitations of traditional processes, but also expands the application scenarios of pulse compression gratings in large-scale laser devices, laser nuclear fusion and other fields. The deep integration of ultrasonic spraying technology and grating preparation process proves the driving role of advanced manufacturing technology in upgrading the performance of core optical components, laying a solid foundation for the further development of ultra short pulse laser technology. In the future, with the continuous optimization of process parameters, the performance of pulse compression gratings will achieve greater breakthroughs, providing stronger support for the industrial application of laser technology.

About Cheersonic

Cheersonic is the leading developer and manufacturer of ultrasonic coating systems for applying precise, thin film coatings to protect, strengthen or smooth surfaces on parts and components for the microelectronics/electronics, alternative energy, medical and industrial markets, including specialized glass applications in construction and automotive.

Our coating solutions are environmentally-friendly, efficient and highly reliable, and enable dramatic reductions in overspray, savings in raw material, water and energy usage and provide improved process repeatability, transfer efficiency, high uniformity and reduced emissions.

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