the trouble of changing battery of green laser pointer

Magneto-optical modulation: the use of magneto-optical effect you want to pass information into the optical carrier intensity (amplitude) parameters change over time. And electro-optic modulator, acousto-optic modulator, magneto-optical modulation of the electrical signal is first converted into the corresponding alternating magnetic field, the magneto-optical effect to change the polarization state of light waves in the media transmission, in order to change the light intensity and other parameters of the destination (d) direct modulation: information to be passed into the current signal is injected into the semiconductor light source (laser diode LD or semiconductor diode LED), to obtain the modulated signals.What are the main functions and features of this china laser pointer? Due to it is in the light-house, also known as modulation, it is a practical modulation of the common use of optical fiber communication systems. (e) spatial light modulator: can be formed with the xy coordinate changes in amplitude or intensity transmittance can be formed with the coordinates of changes in amplitude (or intensity transmittance (x, y) = A0T (x, y)] or formed with the coordinate changes or intensity) transmittance of the phase distribution [A (x, y) = A0Texp [iθ (x, y)]] or the formation of a scattering state with the coordinates change. As the name suggests, this is a light wave space distribution of the modulation device. It is the English name of Spatial Light, Modulator (SLM). Chapter operations (laser technology - blue letter huge blue letter huge, Chapter 2 operating (laser technology blue letter huge, 103) a principle of giant pulses of high peak power Q-switched technology, and a brief description of the Q-switched the formation of various parameters over time in the process of change.The china laser pointer uses the polymer Li battery. A: (1) the use of Q-switched giant pulses of high peak power principle: In order to level the maximum population inversion in the laser material subject to the limitations of the laser threshold, can level accumulation of a large number of particles in laser pump early, managed to a high laser threshold tone, inhibit the generation of laser oscillation, the number of significant accumulation of the upper level inversion, the maximum when the particle number then suddenly lowering the threshold so, accumulate in the upper level of the particles will avalanche transition to a low energy level, People can charge the battery of china laser pointer directly by the USB port.the energy released in a very short period of time, high peak power of giant pulse (2 ) pulse forming process parameters with the time change: to the mutation of the cavity loss is recorded as t = 0, only prepared the initial particle number density Δni Prior to this, t = 0 when the pump power will be depleted, particle reverse the number Δn reach the maximum Δni, by the number of laser sub-zero, ie, Φ = Φi = 0, by stimulated emission of radiation dominated by the avalanche process began to take shape after a period of time, Φ the rapid growth of, Δn began the sharp decline in this process continues until the Δn = Δnt (threshold), the cavity photon number reaches its maximum Φm. tc photons in the cavity on the life of each photon energy hν, the laser peak power Pm = hνΦm/2tc (this question is to draw each parameter with the time diagram, and then analyze the various parameter changes can be).People may cancel the trouble of changing battery of green laser pointer. the vicinity of the polarizing prism EO Q-YAG lasers, try to answer or calculation of the following questions: (1) Draw the structure of the Q-switched lasers diagram, and mark the polarizer polarization axis and the relative orientation of the spindle of the electro-optic crystal (2) how to adjust the polarizing prism from the relative position of partial orientation and crystal to get the desired switching effect?