Swiss scientists succeeded in obtaining 2μm wavelength doped 铥 fiber lasers, this type of laser through a simple and inexpensive structure, eliminating the need for expensive isolators and amplifiers. By designing a simple and novel THETA resonator structure, the light can be transmitted in the wrong direction in the optical fiber to achieve laser one-way transmission. This method is not only cheaper but also achieves higher output power than comparable lasers. 2μm wavelength laser is its key technology into operation. The absorption wavelength of the first oscillation frequency of OH bonds in water is in the range of 1.92-1.94 μm, which enables the 2 μm wavelength technique to be used in "bloodless" laser surgery in which water molecules can narrow incisions in the blood of the tissue and rapidly solidify. The multiple absorption lines of H2O, CO2 and NO2 in the atmosphere are also located in this area, presenting great potential for meteorology, environmental science and agricultural science and technology. In addition, there are some applications in free space communications, material processing and spectroscopy. Currently, other fiber lasers in the 2 μm wavelength range are costly and cumbersome and require an optical isolator to achieve one-way transmission of light. Camille-Sophie Brès, a professor of electrical engineering at the Photonics Systems Laboratory in Lausanne, Sweden, and his PhD student Svyatoslav Kharitonov, used an annular fiber cavity THETA resonator to introduce an irreversible loss into an S-shaped feedback. The isolator typically uses a clunky Faraday rotation and a 45 ° orthogonal polarizer to suppress the backward transmission of light, and THETA resonators do this by indirectly structuring. The design also includes a non-linear magnifier in the cavity to ensure a narrow linewidth of the emission spectrum. The laser beam produced maintains a watt-level output in the 1900-2050 nm range with a linewidth of only 0.2 nm. The researchers said they will continue to optimize the laser to achieve high quality and stable laser output.
Threaded Rebar Bolt
Threaded Rebar Rock Bolts(Threaded Steel Rock Bolts) are mainly used in mines where rock formations such as coal mines are not hard enough. bolts are generally used together with anchoring agents to achieve end anchoring or full anchoring in mines.
ANTO Rebar Rock Bolt is made of high-strength HRB500 or HRB600, which can provide high load-bearing capacity to protect mine safety.
Compared with other bolts, it can be installed using ordinary foreign drilling rigs, which saves installation costs.
ANTO Rebar Bolts, the threads are distributed throughout the rod body, increasing the moving length of the nut, if the anchor rod support is loose in the later stage, tighten the nut, and the anchor rod restores the support force.
The one-way left-handed rebar bolt without longitudinal reinforcement can be used in all kinds of mines and underground projects, and is especially suitable for the support of coal tunnels with wire mesh. It has achieved good technical and economic effects.
The structural features of the anchor rod: the full length of the body has a rolled continuous thread, and the full length is of equal strength; the fastening end is provided with a prestressed gasket and a ball nut. It is superior to the bolt processed by round steel, and is a new type of bolt with material saving, labor saving and equal strength.
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