The circuit control of this cell phone jammer is APC circuit

The damage degree of  cell phone jammer
The difference between two adjacent resonant frequency vibration frequency c/2l = 1.5 × difference υ '= c/2l = 1.5 × 108Hz from the cavity frequency waves emitted by the number of υ and υ' the ratio of these two values determined: the ratio of these two values to determine: υ / υ '= 10 from the cavity frequency of light emitted inside the number 10 to number 10 the frequency of light waves, we can select the appropriate approach to the cavity control light wave frequency range of the frequency at this time smaller, then smaller wave frequency range, but still we always want more than one resonance frequency of the laser is only a laser out of resonance frequency, we always want only one laser out of the laser resonance frequency, The outside measurement of the  cell phone jammer  is 13.5*160mm.So we need to select the single-mode single-mode selection of a shorter cavity length (1) to shorten the cavity length, but this will reduce the laser output power, output power, making it unstable because: This is because: υ '= c / 2l, and the resonance frequency of the number = υ / υ '= c/2l the resonance frequency of the number = use Fabry - Perot etalon, (2) the use of Fabry - Perot etalon, which is more commonly used FP method with a standard nature: nature: to meet the equation has a very high light transmittance. transmittance Figure a) do not choose the mode when there are five longitudinal modes, longitudinal modes, between the two modes spacing distance between the laser interval graph b) etalon transmission curve, the standard curve with the transmission in υk-1, υk, υk +1 at a high transmittance, reflectivity, and their spacing is much larger than the longitudinal mode laser interval graph c) is only a five longitudinal modes via standard with three laser coherence (1) Landscape mode: The circuit control of this  cell phone jammer  is APC circuit.Landscape mode: Landscape mode causes the diffraction phenomenon is present in the laser cavity laser mirrors at both ends of the role: laser resonator mirrors at both ends of the role: I. the role of the light reflected from the II. from the aperture edge effect, caused by diffraction from the aperture edge effect, diffraction results: diffraction results: 1, when the beam through a series of apertures , its amplitude and phase of the beam through a series of apertures, the spatial distribution of successive inevitable distortion, the spatial distribution of successive distortion is inevitable, and tend to a certain degree of stability in the distribution of the final state 2,Please keep the  cell phone jammer  far away from where the kids can get. the transverse mode spot map z-axis with the spindle in the plane perpendicular to take the x-axis and y axis in the z-axis with the plane perpendicular to take the x-axis and y-axis, we use symbols to represent the various landscape mode TEMmn to represent a variety of landscape mode, we use the symbol TEMmn to represent a variety of landscape mode. m, n are non-negative integers, respectively, in the x-axis and ym, n are non-negative integers, respectively, in the x-axis and y-axis direction are non-negative integer intensity of glazing zero-zero ordinal number of those, the direction of polishing those strong zero zero ordinal, ordinal number is called mode 3, the laser diffraction loss N = a2/λl, known as the Fresnel number.