Optimal temperature in the optical axis pumping, the rubidium atomic vapor density of about one / When the bubble diameter of 5cm sample container wall when the atomic surface density of about a /, the rubidium atoms collide with the wall of the loss of polarization the main reason. Bubbles in the sample into the 10 care about filling the buffer gas can greatly reduce this impact, because the high pressure buffer gas density is about a /, rubidium vapor atomic density than six orders of magnitude, greatly reducing the rubidium atoms and the wall chance of collision, to maintain a high degree of atomic polarization. Temperature rubidium vapor atomic density increases, rubidium atoms with the wall and the collision between rubidium atoms are increased, reducing the atomic polarization. The temperature is too low too few rubidium atomic vapor, the signal amplitude is small, so there is optimum temperature range, generally between 40 and 60. The workshop needs to renew some equipments of machining 100mW green laser pointer.
Similar conclusions, the difference is the light optical pumping of atoms to the ground state energy level on the sub. Discussed earlier, the optical pumping of the physical process, it is the process of electric dipole transitions, is the nature of optical resonance. Here we introduce the concept of magnetic resonance. Atom has a magnetic moment of an external electromagnetic alternating electromagnetic field, the magnetic state changes from the movement, so that the amount of atomic state changes. This alternating magnetic field in the amount of state changes as nuclear magnetic resonance dipole transitions, or called magnetic resonance. The manager is introducing green laser pointer with the help of the slide.The worker is loading green laser pointer into the truck
If the light exposure, similar to the above process, the final will be gathered in the sub-atomic energy levels. Clearly, the light irradiation is unlikely the optical pumping process. In the thermal equilibrium state, the ground state energy level of each sub-particles obey the Boltzmann distribution (). As a result of sub-level energy difference is extremely small, approximately can be considered the number of particles on the sub-levels are equal. Optical pumping caused by the atomic particles errand distribution system is non-thermal equilibrium state. Distribution system consists of non-thermal equilibrium state tends to thermal equilibrium distribution of the process is called relaxation process. The leader in the 200mW green Laser Pointer workshop lay much importance on the safety of the worker.
In this study, the microscopic relaxation process is very complex, just to mention a few with the main relaxation processes: rubidium atoms collide with the vessel wall, leading to sub-level of this collision between the transition, the atoms return to thermal equilibrium distribution loss of optical pumping caused by the polarization. Collisions between rubidium atoms, such a collision resulting spin - spin-exchange relaxation. When the external magnetic field is degenerate Zeeman sub-levels, when the relaxation back to thermal equilibrium distribution of the atoms, loss of polarization. Between rubidium atoms and buffer gas collisions, as selected as the buffer gas of molecular magnetism is very small (such as), the impact on the rubidium atomic magnetic energy state disturbance is minimal. This collision of atomic polarization had no effect. The production task of 50mW green laser pointer of this year is tighter than that of last year.
