Some new types of green laser pointer

Oscillation reaches an equilibrium, the energy balance within the laser medium by the stimulated emission gain and the spontaneous radiation gain equal to the cavity loss, and thus the gain of the stimulated emission of radiation should be slightly less than the total loss. For stimulated emission of coherent light, a wave column there is a certain decay rate, it is this attenuation caused by the line width, which is the problem side. Cavity, on the other hand, the spontaneous emission generated before and after a one phase-independent wave trains, these wave trains and the overlay of the coherent wave train of light intensity, so that the intensity of the cavity remained stable. Section by section, independent of the spontaneous emission of the wave train is also caused by a certain line width. These two factors caused by the laser linewidth due to spontaneous emission. Figure (3-17) as shown in curve a is the attenuation spectra of coherent light, curve 2 is the spontaneous radiation itself, lines, curve 3 is the total lines. The manufacturer should meet the logo requirement ofgreen laser pointer put forward by the customer.
Figure (3-17) the limit of the laser linewidth laser output power increases, the energy density of the cavity radiation field is also larger, while the probability of stimulated emission of radiation is proportional to the radiation field energy density, the spontaneous emission The probability is constant, so by Stimulated Emission of Radiation proportion also increased accordingly, the width of the laser oscillation spectrum corresponding narrowing. This means that increasing the laser output power can reduce the laser linewidth due to spontaneous emission. Theoretical calculations show that this laser linewidth and the laser output power is inversely proportional. The theoretical calculations also pointed out that simply because the cavity spontaneous emission caused by the laser linewidth is much smaller than l The Hz,. Of 0.6328m for example, the cavity length L = lm, one-way loss of a total ≈ 1% each end of the output of 1 mW at the He-Ne laser spectral line width of about 5 × 10 4Hz, which is extremely small linewidth The experimentally measured laser linewidth is much larger than this value. The company give the sample of the featured products ofgreen laser pointer to the customer.
This suggests that the laser linewidth than the spontaneous radiation even more significant. Nevertheless, the analysis of spontaneous emission caused by the laser linewidth is very meaningful. Spontaneous emission in any laser, the laser linewidth is caused by such factors can not be ruled out. In other words, this line width is to eliminate a variety of other factors increase the laser linewidth can eventually reach the minimum line width, so called linewidth limit. Produce other aspects of the laser linewidth because of the reasons for belonging to the external aspects, especially the laser stability - factors such as fluctuations in temperature, mechanical vibration, atmospheric pressure and humidity changes, air convection, loss fluctuations gain fluctuations and the fluorescence center frequency drift and so on. The color ofgreen laser pointer is various.
Change when the laser frequency instability and drift, the laser oscillation would not be the amplitude of a continuous sinusoidal oscillation. It is bound to the formation of a certain frequency distribution, resulting in a certain spectral width. The experiments show that the frequency stabilization of a higher degree of He-Ne laser output line width is about tens of Hz, magnitude, the magnitude of the common He-Ne laser of up to about 104Hz (the fluorescence line width of about 109Hz orders of magnitude). Wider spectral width of the solid-state lasers and semiconductor lasers, typically above 106Hz. - The quality of 3.7 Laser beam quality factor M 2 in laser technology and its applications, as well as the design and production process of the laser beam quality is an important indicator to measure the merits of the laser beam. If the relevant materials haven’t been exploited yet, there will be no chance for we to see some new types of green laser pointer.
Therefore, the definition and testing of the beam quality is an important part of laser research. However, a long 114 time, the beam quality has been no precise definition, nor does it establish a standard measurement method, this inconvenience to the research and application. The development process of the laser, for different purposes, have used a variety of parameters to evaluate the beam quality, such as the focused spot size, the far-field divergence angle. However, due to the laser beam through the optical system, the waist size and divergence angle can be changed to reduce the radius of the waist spot is bound to make the divergence angle increases, so alone divergence angle or separate use of the waist spot size to evaluate the beam quality is not science. In order to overcome the limitations of the commonly used methods of evaluating beam quality. More details of green laser pointer will be given in the list.