Ultrasonic Spraying of Pulse Compression Grating Coating
Ultrasonic Spraying of Pulse Compression Grating Coating – Cheersonic
With the rapid development of ultrashort pulse laser technology, chirped pulse amplification (CPA) has become a core support for overcoming laser power limitations. The pulse compression grating, as the “heart” of this technology, directly determines the output performance of picosecond and femtosecond lasers. Among these, the grating’s diffraction efficiency and laser damage threshold are two key indicators, affecting not only laser energy utilization but also the laser’s stable operation and lifespan. Especially in the field of ultra-intense ultrashort pulse lasers, when the output power reaches the petawatt level, the performance requirements for pulse compression gratings have reached a new level. Ordinary commercial gratings are insufficient to meet practical application needs in terms of size, efficiency uniformity, and damage threshold.
In traditional grating fabrication processes, the coating process is prone to problems such as uneven thickness and particle agglomeration, resulting in poor microstructure consistency on the grating surface and consequently, fluctuations in diffraction efficiency. This non-uniformity is more pronounced in the fabrication of large-size gratings, with some areas exhibiting diffraction efficiencies below 90%, far from the high consistency requirements of core applications. The demands of ultra-intense, ultra-short pulse laser systems on gratings have long since shifted from simply “meeting basic needs” to achieving comprehensive performance breakthroughs in “high uniformity, large size, and high stability.” This demand is driving innovation in fabrication technologies.
The introduction of ultrasonic spraying technology provides an effective solution to the problem of uniformity in grating diffraction efficiency. This technology uses ultrasonic vibration to form micron-sized uniform droplets of coating material. Combined with precise airflow control and a motion platform, this achieves uniform deposition of the coating on the grating substrate surface. Compared to traditional spraying, ultrasonic spraying avoids coating accumulation or voids caused by airflow disturbances, controls droplet diameter distribution deviation to within 5%, and reduces coating thickness error to ±0.1 micrometers, fundamentally ensuring the consistency of the grating groove structure.
In actual fabrication, ultrasonic spraying technology can precisely match the microstructural requirements of the grating. By adjusting the spraying pressure, frequency, and speed parameters, the coating material perfectly fills the grooves and forms a smooth surface. This refined control not only improves the diffraction efficiency of the grating but also achieves a qualitative leap in efficiency uniformity—in the fabrication of meter-sized gratings, the diffraction efficiency fluctuation across the entire region can be less than 2%, with an average diffraction efficiency consistently reaching 97%. Simultaneously, the uniform coating structure reduces energy concentration points during laser irradiation, indirectly increasing the laser damage threshold of the grating and enabling the product to withstand long-term irradiation by ultra-intense lasers.
This dual breakthrough of meter-sized gratings 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 fusion, and other fields. The deep integration of ultrasonic spraying technology and grating fabrication processes demonstrates 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-intense and ultra-short pulse laser technology. In the future, with continuous optimization of process parameters, the performance of pulse compression gratings will achieve even 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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