The laser-produced must be able to provide the optical positive feedback
cavity. In the excited state of particles due to the instability of spontaneous
emission to the ground state, spontaneous emission of photons in all directions,
off axis photons will soon escape the cavity, only photons along the axial part
of the output through the output mirror, some is reflected back to the work
material is magnified multiple times in the back and forth between two mirrors,
the formation of stimulated emission, optical amplification, laser-generated.
Optical frequency multiplication principle. Light of the multiplier is one of
the most commonly used nonlinear optical expansion band. Frequency doubling of
laser light of frequency ω, the nonlinear interaction in the crystal, resulting
in the light of frequency 2ω. Actually, this kind of 3 in 1 green laser pointer
is really practical and popular in both the domestic market and oversea market.
When the interaction between light and matter, the atoms in the material
arising from the dipole moment due to induction. Induction electric dipole
moment per unit volume of stack up to form the vector of electric polarization
intensity. The polarization field generated by the electric polarization
intensity emitted secondary electromagnetic radiation. When the electric field
strength of the external light field is much smaller than the electric field
strength in the material atoms, substance induced polarization intensity is
proportional to the external electric field strength. Before the laser does not
appear, when there are several different frequencies of light waves with the
substance, the various frequencies of light are linearly independent reflection,
refraction and scattering, to meet the wave superposition principle does not
produce a new frequency. When the electric field strength of the outside light
field is large enough (eg, laser), the response of the material and light field
and the external electric field strength with non-linear relationship. green
laser pointer will make it more convenient for the customer to use the laser
pointer in the practical use. No matter whether the customer in the corner of
the classroom or lecture hall or the user is at the back of the meeting room to
interact with the audience at site, the user or customer just needs to press the
button on the wireless presenter green laser pointer .
Connected to the
He-Ne laser power. Black and white holes close to the He-Ne laser to adjust the
inside of the retaining bolt, black and white holes away from the He-Ne laser to
adjust the lateral mounting bolts. The above steps repeatedly adjusted until
both near and far 632.8nm laser is always through the black and white holes
center. Pumped semiconductor laser optical path coaxial adjustment. 808LD fixed
two-dimensional adjustment rack.
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