The working principle of the barium tungsten electrode laser pump lamp mainly involves two processes: electroluminescence and laser pumping.
First, electroluminescence is the key step for the barium tungsten electrode to generate light. When current passes through the barium tungsten electrode, electrons can easily escape from the electrode surface due to the low work function and large current density of the barium tungsten material. These escaped electrons are accelerated under the action of the electric field and collide with atoms or molecules in the gas, causing the gas atoms or molecules to be excited to a high energy level. When these excited atoms or molecules retreat to a low energy level, light energy is released, that is, light is generated. Due to the characteristics of the barium tungsten electrode, it can produce light with higher brightness and a wider spectral range.
Next, laser pumping is the process of using the light generated by the barium tungsten electrode to excite the laser medium to generate laser. The laser medium is a substance that can absorb light energy and convert it into laser radiation. In the laser pump lamp, the light generated by the barium tungsten electrode is focused on the laser medium. After the laser medium absorbs the energy of these photons, the atoms or molecules inside it will be excited to a high energy level. When these excited atoms or molecules retreat to a low energy level, they release photons that match the characteristics of the laser medium, which is the generation of lasers.
Specifically, the laser medium in a laser pump lamp is usually a solid, gas or liquid with a specific energy level structure. The light generated by the barium tungsten electrode is selectively absorbed, causing the number of particles at certain energy levels in the laser medium to increase, forming a particle population inversion distribution. When certain conditions are met, such as reaching a certain degree of particle population inversion and light intensity threshold, the particles in the laser medium will undergo stimulated radiation, generating photons with the same frequency, direction, polarization state and phase as the incident light, i.e., lasers. These laser photons are reflected and amplified multiple times in the laser medium and are finally output from the output end of the laser pump lamp.
In short, the working principle of the barium tungsten electrode laser pump lamp is to generate light through electroluminescence and use this light to excite the laser medium to generate lasers. The low work function and high current density characteristics of the barium tungsten electrode enable it to generate light with high brightness and a wide spectral range, providing an ideal pump light source for laser pumping.
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