English

An efficient femtosecond pulse amplification technique for extracting the maximum stored energy in fiber laser amplifiers

1285
2024-11-13 11:55:15
See translation

The well-known journal Optica published a paper in November 2024 titled "Near complete extraction of maximum stored energy from large core fibers using coherent pulse stacking amplification of femtosecond pulses"The authors of the paper were the University of Michigan, Lawrence Berkeley National Laboratory, Peking University, and the German Institute of Synchrotron Radiation.

The specific technique is to use a cascaded "GTI" (Gire Tounois interferometer) method to synthesize 81 amplified pulses together in the time domain. The technical difficulty that needs to be overcome is to control the phase and amplitude of each pulse to achieve coherent synthesis. The core femtosecond light source is a 1 GHz repetition rate femtosecond fiber laser, developed by Professor Zhang Zhigang's group at the School of Electronics, Peking University.

The author of the paper has demonstrated using the aforementioned techniques that, with a continuous pump of 100 W and a repetition rate of 2 kHz, nearly 10 mJ of amplified pulse energy can be extracted, far exceeding the energy output of conventional large mode area fiber amplifiers, which can reach less than 1 mJ. The extraction efficiency is close to 90%.

This efficient time-domain pulse synthesis technique can greatly improve the efficiency of pulse synthesis and reduce the number of amplifiers used for spatial synthesis.

Although the repetition rate and pulse energy obtained from this experiment are not yet high, this technology demonstrates the potential to generate femtosecond strong laser pulses with Joule level pulse energy and repetition rates above 10 kHz. It may provide a light source for studying strong field physics and particle accelerators under extreme conditions, as well as for generating secondary radiation.

Figure 1 shows the efficiency of pulse energy extraction in a fiber amplifier independent of core diameter under nonlinear confinement. Figure 1 indicates that the pulse extraction efficiency can only approach 100% of the amplifier's stored energy when the pulse is broadened to 100 ns


Figure 2 shows a schematic diagram of a composite GTI cavity, where 81 incident laser pulses are coherently superimposed in four large loop cavities to form 9 pulses; Then coherently superimpose them into one pulse in four small cavities


Figure 3: Photo of the Composite GTI Chamber Experimental Device


Figure 4 shows the pulse waveform and spectrum of the coherent synthesized pulse with an energy of 3 mJ and a width of 313 fs

Source: Yangtze River Delta Laser Alliance

Related Recommendations
  • Halo Industries raises 580 million yuan to achieve significant breakthrough in SiC laser processing field

    Recently, Halo Industries, an innovative technology company based in California, announced that it has successfully raised $80 million in Series B venture capital, marking a significant breakthrough in its use of laser technology to revolutionize the production of silicon carbide (SiC) semiconductor wafer substrates.This financing is led by the US Innovation Technology Fund (USIT) and involves hea...

    2024-07-18
    See translation
  • Zhongke Yuchen laser welding technology opens up vast space for the welding process of new energy vehicle motors

    The application of laser welding technology in the welding process of new energy vehicle motors is a typical example of Zhongke Yuchen in many welding cases. The main accessories of the automatic laser welding equipment for new energy vehicle motors are imported products, and the welding process is mature and stable.Motor rotorMotor statorLaser welding of motor stator tapThe circumferential wel...

    2023-10-18
    See translation
  • Southern Stoneworks revolutionizes countertop installation in Orlando with innovative laser technology

    A good countertop can make a home better. In that spirit, Southern Stoneworks, Orlando's leading countertop manufacturer and installer, has set a new standard in the industry by incorporating advanced laser technology into its processes. Utilizing state-of-the-art laser-guided saws and tools, the company has significantly reduced the time required to measure, manufacture, and install kitchen count...

    2023-08-04
    See translation
  • Progress in the Research of Continuous Wave Laser in Chemical Industry

    Laser plays an important role in fields such as photonic chips, laser displays, and in vehicle radars. Organic materials have advantages such as molecular diversity, energy level richness, heterogeneous compatibility, and ease of processing. They have significant advantages in the construction of high-performance and multifunctional lasers and are expected to further innovate laser technology and ...

    2023-08-31
    See translation
  • SILICON AUSTRIA LABS and EV GROUP Strengthen Cooperation in Optical Technology Research

    EV Group, a leading supplier of wafer bonding and lithography equipment for the MEMS, nanotechnology, and semiconductor markets, and Silicon Austria Labs, a leading electronic systems research center in Austria, announced that SAL has received and installed multiple EVG lithography and photoresist processing systems in its MicroFab at the R&D cleanroom facility in Filach, Austria.These devices...

    2023-11-15
    See translation