chanelink logo
CHANELINK
English

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

919
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

  • Progress in research on neodymium doped strontium aluminate lanthanum magnesium laser crystals by Shanghai Optics and Machinery Institute

    Recently, the Advanced Laser and Optoelectronic Functional Materials Department of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, has made progress in the research of Nd: ASL (Sr0.7Nd0.05La0.25Mg0.3Al22.7O19) laser crystals, and the related achievements were published in Infrared Physics&Technology under the title of "Tunable laser operations on Nd doped cont...

    2024-03-19
    See translation

  • Creativity Falcon 2 laser cutting machine will be launched in Germany equipped with a new 60W laser head

    Starting from June 20th, The Creativity Falcon 2 laser cutting machine will also be launched in Germany, equipped with a new 60W laser head. With this ability, fully encapsulated equipment can now also be carved into steel. High power is achieved through twelve 5-watt laser diodes, whose beams are combined with each other. This will make it possible to cut 22mm thick lime wood and 30mm thick or...

    2024-05-29
    See translation

  • Advanced OPA enhances the energy of attosecond imaging ultra short pulses

    The attosecond level ultra short laser pulse provides a powerful method for detecting and imaging ultra short processes, such as the motion of electrons in atoms and molecules.Although ultra short laser pulses can be generated, generating ultra short and high-energy pulses is a continuous challenge. In order to expand the photon energy, photon flux, and continuous bandwidth of isolated attosecond ...

    2024-05-11
    See translation

  • Mechanism of Time Power Modulation Increasing Weld Depth in High Power Laser Welding

    Researchers from the Hanover Laser Center and Leibniz University in Germany reported on the mechanism of increased welding depth during time power modulation in high-power laser beam welding. The related paper titled "Mechanisms of Increasing Welding Depth during Temporary Power Modulation in High Power Laser Beam Welding" was published in Advanced Engineering Materials.Understanding the basic mec...

    2024-12-18
    See translation

  • Scientists have developed the most powerful ultraviolet laser using LBO crystals

    It is reported that recently researchers from the Chinese Academy of Sciences have achieved the highest power output of 193 nm and 221 nm lasers using lithium borate (LBO) crystals. This achievement lays the foundation for the further application of the laser in deep ultraviolet (DUV) spectroscopy.The laser in DUV spectroscopy has many applications in science and technology, such as defect detecti...

    2024-04-07
    See translation