It is the multiple function charger of laser pointer

But for the CD in terms of technically has not changed, only the data compression, picture quality is only VHS standards, but is a transitional product in a foreign country without the formation of the market. The digital image signal editing quality deterioration, easy computer processing, etc., they are able to record more than two hours of high definition digital image of the CD-ROM, already makes long-awaited. In recent years, the progress of short-wavelength semiconductor laser technology, the thin disc substrate technology, material lens of high numerical aperture NA of technology such as high-density disc recording density as possible, consecutive variable screen compression technology there are a lot of progress, the long high-quality continuous variable screen included in a CD-ROM as possible. Of course, the customer should consider whether the parameter and performance of laser pointer conforms with the real needs and actual requirements except for the cost performance.It is the multiple function charger of laser pointer
The basic principles of the photonic crystal fiber laser [7,8]. Double-clad photonic crystal fiber laser with conventional lasers, but also consists of three basic parts: the pump source, the gain medium and the cavity. The pump source of energy incentives doped rare earth ions in the double-clad layer of the fiber core, the formation of inversion so that stimulated emission of light in the resonator oscillation amplification, and finally the formation of the laser output. Figure 4 basic principles of photonic crystal fiber laser. PCF fiber, many air holes is not conducive to the welding of the fiber ring cavity structure of the PCF laser is difficult to achieve the reported PCF laser multi-linear FP cavity. Shown in Figure 4, a period of PCF as the gain medium, the dichroic mirror (M1), mirror (M2).  Figure 2 shows the structure of Japan's Sanyo red semiconductor laser diode. Figure 3 for low-power laser tube sectional view seen from the Figure, the laser chip is attached to the heat sink is used to heat the tube seat near the lower part of the laser chip seal PIN photodiode. Figure 4 shows the shape of the ordinary laser diode, the figure shows, low-power laser tube with three pins. In all, the customized service of laser pointer is a kind of personalized service for the customer.
This is also encapsulated in the tube has a photodiode for monitoring the operating current of the laser tube. Commonly used parameters of the semiconductor laser diode: wavelength: the laser tube operating wavelength for photoelectric switches with laser wavelength of 635nm, 650nm, 670nm, 690nm, 780nm, 810nm, 860nm, 980nm, etc..When the receiver circuit shown in Figure 6 (b), when receiving the demodulation module M6938 receives the laser signal.