English

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

1251
2024-04-17 16:11:47
See translation

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 continuum and lanthanum aluminum crystals".

Neodymium (Nd3+) ion is one of the common activating ions, and its absorption peak matches the emission wavelength of commercial laser diodes (LDs), with high absorption efficiency at 0.9, 1.05, and 1.35 μ There are emission peaks at position m, and laser emission has been achieved in various matrix materials. Nd: ASL is a typical disordered crystal, belonging to the hexagonal crystal system. The high disorder leads to its spectral broadening, which is beneficial for generating lasers of different wavelengths.

In order to investigate its tuning characteristics, the research team grew Nd: ASL crystals with a doping concentration of 5%, and measured their fluorescence lifetime to be approximately 371.8 μ S. At 1.05 μ Near m, its fluorescence spectrum has four strong and continuous emission spectra. A birefringent filter was inserted into the V-shaped resonant cavity for tunable laser experiments. By using output mirrors with transmittance of 5%, 7%, and 10%, three independent wavelengths (1050, 1062, and 1074 nm) of laser output were obtained. The wavelength range is 1049.59-1054.43 nm and 1059.71-1078.18 nm for tuning, with a tuning width greater than 20 nm, which is consistent with the spectrum. The phenomenon of multi wavelength laser output was also observed in the experiment. The results indicate that Nd: ASL crystals are a gain medium suitable for tunable lasers. Compared with single wavelength laser media, controlling and changing the wavelength is much more convenient and suitable for complex application scenarios with higher accuracy or more wavelengths.

This work has received support from projects such as the National Natural Science Foundation of China.

Figure 1. Fluorescence spectrum of Nd: ASL crystal

Figure 2. Laser output with three wavelengths at different output mirror transmittance

Figure 3. Output power at different wavelengths under the same absorption pump power

Source: Shanghai Institute of Optics and Precision Machinery

Related Recommendations
  • Researchers enhance the signal of perovskite nanosheets

    In the field of optoelectronics, researchers from Busan National University in South Korea and the University of Oxford in the UK have successfully improved the signal amplification ability of CsPbBr3 perovskite nanosheets through innovative patterned waveguide methods, bringing new possibilities for the future of optoelectronics. This breakthrough not only has potential applications in fields suc...

    2024-02-22
    See translation
  • The new chip opens the door to artificial intelligence computing at the speed of light

    Engineers at the University of Pennsylvania have developed a new chip that uses light waves instead of electricity to perform complex mathematical operations necessary for training artificial intelligence. This chip has the potential to fundamentally accelerate the processing speed of computers while reducing their energy consumption.The design of a silicon photonic chip was the first to combine t...

    2024-02-18
    See translation
  • Progress in the Application of China University of Science and Technology's Femtosecond Laser Processing Technology in the Biomedical Field

    Recently, Associate Professor Li Jiawen's research group at the Micro and Nano Engineering Laboratory of the School of Engineering Science, University of Science and Technology of China proposed a femtosecond laser dynamic holographic processing method suitable for efficient construction of three-dimensional capillary scaffolds, which is used to generate a three-dimensional capillary network. This...

    2024-02-11
    See translation
  • Jenoptik Jenoptik Group's new factory officially completed in Germany

    After two and a half years of construction, Jenoptik Jenoptik Group's new factory in Dresden, Germany has been officially completed, marking the company's largest single investment in recent times. Jenoptik stated that by expanding its production and research and development capabilities in micro optical devices, it will provide high-precision sensor production technology for high-performance chip...

    05-16
    See translation
  • Fraunhofer ILT utilizes short pulse lasers to achieve high-speed optical stamping

    At the Fraunhofer Institute for Laser Technology (ILT), researchers in collaboration with RWTH Aachen University – Chair for Technology of Optical Systems (RWTH-TOS) are using a spatial light modulator (SLM) to shape the beam of an ultrashort pulse laser precisely into the desired pattern to apply to the surface of a workpiece.The developers say that this approach “significantly speeds up processi...

    09-25
    See translation