English

Progress in Calibration of Large Aperture Diffractive Lenses in the High Power Laser Physics Joint Laboratory of Shanghai Institute of Optics and Mechanics

1139
2023-10-14 10:22:56
See translation

Recently, the High Power Laser Physics Joint Laboratory of Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, proposed a single exposure interferometric calibration method for large aperture diffractive lenses, which provides strong support for the engineering application of large aperture diffractive lenses. The relevant achievements are published in Optics Letters as "Absolute measurement of focusing properties of a large aperture diffractive lens".

Compared to reflective focusing lenses, diffractive optical elements are designed flexibly, have a large aperture, are lightweight, suitable for various wavebands, and can achieve complex optical functions. Photonic sieves and zone plates are typical representatives of diffractive lenses. Considering that diffraction elements are composed of a large number of microstructures, deviations are inevitable during the machining process, so performance calibration is necessary before use.

In this study, researchers used the natural background light of a large aperture diffractive lens as a reference and entered the shear interference system together with the focused beam. Based on the interference pattern recorded by the detector, the wavefront gradient of the focused beam relative to the background light is first obtained using Fourier analysis, and then the transmitted wavefront is reconstructed using the mode method. Finally, the focal length and focal spot morphology of the diffractive lens are numerically calculated. The experimental results of a 210mm aperture diffractive lens meet theoretical expectations. Ultra large aperture zone plates and photon sieves can be used for space interferometric telescopes. The self supporting beam splitting photon sieve is suitable for focusing imaging of EUV and soft X-ray. Multi focal photon sieves can be used for X-ray interference diagnosis of plasma.

This work was supported by the National Natural Science Foundation of China and the Chinese Academy of Sciences' pilot A program.

Figure 1. Measurement Optical Path of Large Aperture Diffractive Lens

Figure 2. Experimental results of self-developed shear interferometer and measurement

Source: Shanghai Institute of Optics and Mechanics

Related Recommendations
  • Light Adv. Manuf. | Laser Direct Writing Assists Perovskite Optoelectronic Applications

    IntroductionMetal halide perovskites have excellent optoelectronic properties and have become the undisputed "star" materials in the semiconductor field, attracting great attention from both academia and industry. With a large amount of research investment, the application of perovskite covers various optical and optoelectronic fields such as single photon sources, micro nano lasers, photodetector...

    2024-03-25
    See translation
  • Progress has been made in the development of anti resonant hollow core fiber Raman probes with low background noise at Shanghai Optics and Machinery Institute

    Recently, the research team of the Special Glass and Fiber Research Center of the Advanced Laser and Optoelectronic Functional Materials Department of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, aimed at the demand for in-situ detection of Raman signals, expanded the functions of the laboratory commercial Renishaw Invia confocal micro Raman spectrometer by usi...

    2024-05-22
    See translation
  • Mears Machine Corporation achieves breakthrough in large-scale powder bed laser manufacturing

    Mears Machine Corporation has achieved a global breakthrough by manufacturing the world's largest single unit unwelded powder bed laser components. More details about this revolutionary manufacturing solution will be revealed in the coming months. "This milestone unlocks a new era in large-format metal additive manufacturing," said James Lloyd, CEO of Mears Machine Corporation. "We can now deliv...

    11-08
    See translation
  • Ruisheng Clyde Aerospace Company Commercializes TNO's Satellite Communication Laser Terminal

    AAC Clyde Space, a small satellite technology multinational company headquartered in Uppsala, Sweden, has obtained the right to manufacture and distribute laser satellite communication terminals using the optical technology of the Dutch research institution TNO.TNO's technology helps to transmit satellite generated data to Earth through lasers, with the potential to achieve high speed and security...

    2024-05-24
    See translation
  • Innovative nanoparticle analysis: achieving breakthrough 3D imaging using X-ray lasers

    The latest progress in X-ray laser technology has opened up a new era of nanoscale exploration, bringing unprecedented opportunities for materials science and nanotechnology. Researchers have developed a novel imaging technique that can directly visualize separated nanosamples in free flight, capturing their complex structures with stunning details. This breakthrough method relies on single cohere...

    2024-03-05
    See translation