green laser pointer company has rich professional technical experience
The
Fresnel number is a characteristic parameter for the characterization of the
resonator diffraction losses. The diffraction loss curve of a diffraction loss
and the relationship of the Fresnel number N is generally more complex, and
often write the analytic expression and digital computer calculation. Therefore,
usually the count results are plotted into a curve, which is called the
diffraction loss curve. The picture of a confocal cavity and the circular cross
section of circular cross section parallel to the curve of the planar cavity, 1.
N greater the smaller the δ D; In the same N, the transverse mode the higher the
ordinal number of δ D greater; in the same N and the same number of cross-motif
confocal cavity is much smaller than the plane parallel to the cavity, which is
due to concave mirror The convergence of the role of light is more concentrated
in the center of sake. Huaye green laser pointer company has rich professional
technical experience in optics.The one-way diffraction loss of the symmetric
cavity TEM00 mode changes with the Fresnel number is drawn. In the same N, the
closer the confocal cavity (g = 0), the smaller the diffraction loss. Mode
volume of the fundamental mode volume in a model used to describe the spatial
extent of the expansion mode in the cavity. Mode volume oscillation in this
mode, the role of the number of excited particles, and thus, the output power.
On the contrary, the mode volume is small, the output power is small. The volume
of the fundamental mode varies with the cavity and g N parameters change.Huaye
green laser pointer company has rich professional technical experience in
machine. The structural parameters of the cavity; Fresnel number resonator
theory analysis shows that, when considering the symmetric cavity (R1 = R2), the
fundamental mode (TEM00) Gaussian beam waist of W0 can be expressed as follows:
with the following properties: (1) mirrors radius of curvature R is increased,
the fundamental mode waist W0 increases, thus the volume of the fundamental mode
increases. Therefore, the parallel plane cavity larger mode volume. ② When the R
value W0 with the cavity L changes there is a great value, we can draw the
maximum conditions for L = R (confocal cavity). More than the nature of
practical significance in the election mode technology. In addition, the
transverse mode selection is also a necessary condition for single-frequency
lasers required. Only selected on the basis of a single transverse mode single
longitudinal mode laser to get single-frequency oscillation. Huaye green laser
pointer company has successfully researched and developed several laser
products.Laser single transverse mode selection method (1) the choice of cavity
parameters g, N transverse mode of the cavity is different cavity cross mold the
diffraction losses under.
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