Laser equipment is the core of lasers, review the history of laser technology, from ruby ​​lasers to helium-neon lasers and now all kinds of lasers blossoming, laser technology in the field of development has never stopped ... ... Next OFweek laser network will inventory your 2014 Laser Progress and Breakthrough in "Top Ten" Areas (Rankings Not Counting):
1, the highest average power all-solid sodium guide laser developed successfully
In September this year, Institute of Applied Electronics, China Academy of Engineering Physics, successfully developed the world's highest level of all-solid-state sodium guide laser with an average power of 81 watts. In the future, it can be used in large-scale telescopes, laser atmospheric transmission and other scientific research fields Play an important role.
The newly developed high-performance sodium guide laser with spectral line high-precision, high average power, high beam quality and so on. In terms of spectrum, the laser wavelength and sodium atomic absorption spectra are stable and precisely aligned, with an accuracy of 0.2 picometer. In the frequency domain, the laser spectral width reaches sub-GHz, which means "no fat or no thinness". In addition, due to its use of 1064nm, 1319nm solid-state laser and frequency technology, researchers also broke through the two lasers under high power time and space synchronization technology, laser linewidth narrowing technology, high efficiency and frequency technology and many other difficulties. In the future, the research results will play an important role in the fields of astronomical observation, atmospheric observation and laser atmospheric transmission.
In astronomical observation imaging, the light emitted by the observation target undergoes wavefront distortion when passing through the atmosphere, which will lead to the reduction of its imaging quality. Therefore, large telescopes often require a "beacon light source" of sufficient brightness for detecting atmospheric disturbance and performing Adaptive optical compensation correction to dramatically improve imaging resolution. It has been a hot research topic of scientists all over the world that a yellow laser of 589 nm wavelength is emitted to the sky by a laser to cause the sodium atom resonance at a height of 90 km to 100 km in the atmosphere and to produce high brightness "artificial" sodium guide stars by scattering. At present, sodium guide laser has become one of the key devices at the heart of large telescopes such as the TMT (30-meter telescope program).
2, the new polarization laser development: 1000 times less power than the traditional laser
University of Michigan researchers validate a new, practical, and more efficient method of making coherent laser beams that polarize unstable particles across the light and material world. They made the first polarized laser powered by current instead of light and were able to work at room temperature instead of below zero degrees Celsius. This work can push the laser to use computer chips instead of wires to make smaller, more powerful electronics. Can also broaden the medical equipment and treatment methods and more applications.
A typical laser amplifies a signal by an optically pumped gain-dielectric material. Prior to pumping, most of the electrons in the gain medium are in the lowest energy state, the ground state. Once the light or current impact, the electron absorption of energy transfer to a higher energy level, the accumulation of a period of time, high-level electrons than low-level electrons and more equipment to achieve the "particle beam inversion" state. Once the light or current has the opposite effect on the excited electrons, the electrons return to the ground state and emit light.
Polarization lasers, on the other hand, do not rely on this "particle beam inversion," so it does not require much startup energy to excite electrons and then force them to release photons with very small threshold currents, which is a very attractive feature.
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