The wavelength of laser pointer is about more than 600 nm

The wavelength of  laser pointer is about more than 600 nm.
Therefore, in a single exposure. Improve the laser speckle noise signal to noise ratio can be used the following method. Only consider the general design of the laser linear polarization applications, the two polarization components can use to improve the speckle noise, but this will increase the complexity of the system. You can also combine multiple pixels in an image is an actual pixel, which is obviously lower imaging resolution. The most likely approach is to use multiple exposure to different parts of the speckle field sampling, but this increase was observed also increases the laser energy. Multiple exposure combination must meet an important criterion for single-exposure imaging. A knife, or in order to achieve the seven best state, requires too much the number of single exposure.  laser pointer  owns the relatively more mature technology. 
In the course of the study it was found to the speckle carry the beam and the beam through a lot of information objects. So many applications. Such as astigmatism contrast to measure the roughness of the object, the use of dynamic speckle to measure the velocity of the object using speckle optical processing, and even the use of speckle optometry. The initial laser speckle fill a prescription for anti-counterfeit labels. Laser anti-counterfeiting technology including the anti-counterfeiting technology of laser hologram anti-counterfeit labels, the encryption laser hologram anti-counterfeit labels and laser holographic lithography. A first generation of laser anti-counterfeiting technology the first generation of laser anti-counterfeiting technology is molded laser hologram anti-counterfeit labels. The hologram is shooting crystal atomic structure using X-ray photos by Scientific American (M ? J ? for Buerger) and Gabor (D Gaber) established the theory of holography. It is to increase the production output of  laser pointer .
Double-beam interference principle, to make things light and another to produce the interference pattern to the phase "merge" up with a coherent object light beam (reference beam), which use photosensitive film can record the next phase and amplitude, it can be holographic images. However, the hologram is taken in accordance with the principle of interferometry, the high density (resolution) photographic film records. Ordinary light poor monochromaticity, coherence, and thus the slow development of holographic technology, it is difficult to shoot a decent hologram. Unfortunately, the laser speckle counterfeiting in one of there birth defects. Rely solely on the production technology of confidentiality and control of defense, a simple observation class security technology, the observation point to see if the holographic image. The technical personnel of  laser pointer are in the workshop and factory.They are responsible for the inspection and acceptance of  laser pointer