English

Progress has been made in the research of single shot characterization technology for complex combination laser pulses at Shanghai Institute of Optics and Fine Mechanics

553
2025-03-24 17:17:38
See translation


Recently, the research team of the High Power Laser Physics Joint Laboratory at the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, has made significant progress in the study of single shot characterization technology for complex combination laser pulses. The research team utilized an improved broadband transient grating frequency resolved optical switch technology (TG-FROG) to achieve complete characterization of complex high-power laser pulses in a single shot, and revealed the dynamic evolution law of ultra short pulses during nonlinear frequency conversion. The related research results were published in Optics Express under the title "Single shot complete characterization of synthesized laser pulses and non-linear frequency conversion process".

The combination of laser fields (pulse combinations with different polarizations, center wavelengths, or pulse widths) has important applications in fields such as ultrafast spectroscopy and high-order harmonic generation, but its precise measurement faces multiple challenges. Traditional methods are limited by polarization sensitivity, insufficient measurement bandwidth, or the need for multiple measurements, making it difficult to meet the real-time diagnostic requirements of high-power, low repetition rate laser systems. In addition, the dynamic characteristics of the nonlinear frequency transformation process of complex pulses lack effective observation methods, which restricts the optimization and application expansion of laser systems.

In response to the above challenges, the research team based on improved TG-FROG measurement technology, designed a self referencing and reflective structure with a wideband imaging spectrometer, to achieve single measurement support for at least 460nm spectral range, with a time resolution of 5.81 fs and spectral resolution better than 0.13 nm. The synchronous observation of waveform and spectral evolution of fundamental frequency pulses and second harmonic pulses during nonlinear frequency conversion has been achieved, revealing complex modulation effects such as spectral broadening, redshift, and time-domain multi peak structure under high-energy injection. And successfully measured the dual color pulse with spectral time-domain separation generated by the cascaded second harmonic process, and analyzed its time delay (208.4 fs) and relative phase (0.29 rad), breaking through the phase ambiguity limitation. This method not only provides a good measurement method for optimizing the waveform and contrast of ultra wideband laser pulses, but also provides a powerful diagnostic tool for complex nonlinear optical physical processes.

Figure 1 (a) Single broadband TG FROG device; (b) The process of broadband nonlinear frequency transformation and the experimental optical path diagram of dual pulse measurement.

Figure 2 TG-FROG synchronous measurement results of fundamental frequency pulse and second harmonic pulse during SHG process under high injection energy

Source: opticsky

Related Recommendations
  • New laser technology unlocks deuterium release in aluminum layers

    In a recent study, quadrupole mass spectrometry was used to measure the number of deuterium atoms in the aluminum layer.A recent study led by the National Institute of Laser, Plasma, and Radiation Physics and Sasa Alexandra Yehia Alexe from the University of Bucharest explored the details of laser induced ablation and laser induced desorption techniques using a 1053 nm laser source. The study was ...

    2023-11-25
    See translation
  • The team of researcher Wei Chaoyang of Shanghai Optical Machinery Institute has realized the manufacture of fused quartz components with high resistance to UV laser damage

    Recently, a team led by researcher Zhaoyang Wei of the Precision Optics Manufacturing and Testing Center of the Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, has realized the manufacture of fused quartz components with high resistance to UV laser damage based on the defect characterization and removal process of CO2 laser. The research is published in Light: Advance...

    2023-09-11
    See translation
  • Lockheed Martin announces expansion of 16000 square feet 3D printing center

    Recently, US military industry giant Lockheed Martin announced that it will significantly increase its additive manufacturing capabilities and expand its factory in Texas. The expansion project includes approximately 16000 square feet of dedicated space for 3D printing technology, and the addition of some of the largest large format multi laser printers in the space (it is worth noting that Lockhe...

    2024-12-02
    See translation
  • A replica of an arcade made with a 3D printer in the 1970s

    A game museum has 3D printed a replica of a historic arcade computer space. The arcade museum in Stroud, Gloucestershire lacks the first commercial arcade video game. They collaborated with Heber company to create a real replica. Neil Thomas, the director of the arcade museum, said that because it is a replica, not an original, they are not "afraid" of letting people play with it.A spokesperson...

    2024-05-29
    See translation
  • Korean laser company AP Systems establishes new AVP equipment division

    Recently, AP Systems, a well-known laser manufacturer in South Korea, established a new AVP equipment division for the advanced packaging field. This business unit will focus on laser equipment required for advanced packaging processes of high bandwidth memory (HBM).AP Systems is a subsidiary of APS Group, mainly focused on the fields of display and semiconductor laser processing equipment. It foc...

    01-15
    See translation