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Birefringence dual frequency laser frequency difference tuning phenomenon; birefringent Zeeman dual frequency laser power tuning, the frequency difference tuning characteristics; orthogonal polarized laser feedback self-mixing interference in the mutual inhibition of two frequencies, the strength of the transfer; birefringence external cavity back into the stripe frequency phenomenon; quartz crystal frequency splitting due to rotation of the distortion, etc. Such a method of writing, more in line with conventional thinking, but it is flawed. have little chance of a device according to science (such as birefringent Zeeman dual frequency laser, etc.) to start the process of the invention described so that readers of this invention have a more specific understanding of the process. Simple  green laser pointer    is without any other function like turning over page through remote control.
At this point, will be several important discoveries, inventions as a clue for the process described below, when the birefringence dual frequency laser for the purpose of study, through the frequency splitting technology, a laser output of the two orthogonal linearly polarized light while the experimental frequency difference angle of the quartz crystal tuning curve shape of the unexpected: it is not a monotonically increasing, but has a certain "period" feature of the curve, especially the first two cycles, there is not even reached a longitudinal mode spacing appeared retraction. calculated by the crystal refractive index ellipsoid, the tuning range of 90 ° angle, o light and e light of the refractive index difference is monotonically increasing, that is, only by a quartz crystal birefringence can not explain this kinds of distortion phenomena.    200mW green Laser Pointer    with remote control can set black screen and hyperlink.
After six months of repeated experiments show that the experimental curves obtained withstand the test sent to Optical Communications was published after the experiment, also found that the laser frequency difference can be as large as several megabytes Hz, but not less than 40MHz. It also proposed two question: the first is why the frequency difference can not be less than 40MHz, the second question is how to make the frequency difference of less than 40MHz. studies to get answers to the first question is: Because there is a strong laser mode competition, when the frequency difference is small at 40MHz, the frequency of one of the two orthogonal failure off because of competition, the natural frequency difference will disappear. 40MHz strong mode competition in this range than in the past people in the study of the strong ring laser mode competition to get a large range much more. ring laser range strong mode competition is only the order of MHz.    100mW green laser pointer    with remote control is similar to the function of the wireless mouse.
On the second question, in order to overcome the strong mode competition, access to the small frequency difference is less than 40MHz, from an idea put forward two options. The idea is to try to make o light and e light that each have their own part Gain atoms, no longer compete with each other. two options, one is spatial separation o light and e light, let them go their own optical path, each in their own light on the road and that part of their own gain access to gain atomic interactions, which This book is presented in both 4.6 dual laser refractive components in both the refractive element dual frequency laser, the laser cavity at the same time into calcite and quartz crystal film film, the difference of their birefringence 18.68 times the cavity calcite polarized laser beam is divided into mutually perpendicular, but parallel to the propagation path does not overlap the two beams due to their spatial separation, optical transmission do not coincide, so the competition away. Three Stages of development of    green laser pointer      Technology is as follows.
At the same time, measured in megahertz chip precision quartz crystal accuracy rotation adjustment o light and e light of the frequency difference. The second option is to gain separation for the two groups of atoms, can be considered simply part of their half of the o-ray, the other half belongs to e light, which is described in Section 4.5 Zeeman dual frequency laser birefringence in birefringent Zeeman dual frequency laser, both placed in the cavity frequency splitting birefringent components to obtain o light and e light, but also added to the laser transverse magnetic field, the gain is divided into two groups of atoms, a group o optical zoom, a group of e light amplification. o light and e light only subordinate to gain access to their atomic group, significant reduction of competition between each other, can be stable oscillation. The former technology of  50mW blue violet laser pointer   with remote control is slower.
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