The production requirement of green laser pointer contains a lot of information. Line width has been developed to 2kHz the device, a wide tuning range up to 75nm tuner and a high repetition frequency of 21GHz repetition rate device. Figure 12 is a clamping device based NOLM operating principle [19]. Usual common device based NOLM composed only of NOLM loop, there is no figure of 3dB coupler 12 on the two branches, mainly used to produce compression of ultrashort pulses, does not have a locking feature. Figure 12 shows the improvement of the NOLM device, capable of converting light and dark pulses, pulse wavelength can be selected to produce high repetition rate of the signal. PC1 to regulate the maximum power output when the B-side, available in the A-side light pulse; regulate PC1 to form the ring mold in the A-side reflection on the formation of dark pulses. In the coupler 2 way through the filter to select the output wavelength, and the selected wavelength by EDFA amplification. The user explains some points of the customization requirement of green laser pointer .
When the control pulse and the main loop frequency detuning, when the generated control pulse frequency of the DFB's drive is the main part of the frequency f n per time, available to control the pulse repetition rate n times the output pulse. For example, the main loop frequency f is 19.4kHz, the control pulse modulation frequency is 1145MHz, DFB to drive frequency detuning at 1/4f, you can get 4.58GHz repetition rate of the output pulse. P. Xie and TRGosnell with stones titanium device 860nm pump tens of centimeters long, by replacing the output mirror to obtain a different red, orange, green, blue four colors, the power was 300mW, 44mW, 20mW and 3mW , slope efficiency of 52%, 11.5%, 12.4% and 3%. Cladding-pumped converters on the research work is the latest international research focus, research it in the conventional device, based on the use of frequency conversion technology greatly expands the frequency range of available near-infrared light, visible light and even less wavelength output. The quality feedback of green laser pointer will be discussed during the meeting.
Fiber lasers with waveguide structure can be generated in the fiber core with higher power density. It is based on silicon fiber technology is now very mature, so you can produce high-precision, low-loss optical fiber. If the fiber of choice to run the pump and signal wavelengths are working on single-mode state, the pump and signal overlap between the light field is very good. Since the geometric characteristics of optical fiber, making this structure the size of a high volume ratio, and thus the cooling effect is very good. These characteristics will determine the silicon substrate fiber laser pumped at a lower power output of a continuous work in the state, while the other bulk glass laser medium is generally only work in the pulse state, and often requires a fairly high pump pump power for laser output. Cylindrical fiber structure also has the following two advantages, easy to fold and medicine in the optical communication applications. As the fiber laser is essentially a fiber structure, it can Guotai higher efficiency of optical fiber transmission system with the current connection. The company will perform more inspection of 200mw laser pointer.
As the fiber compact easy to operate, some applications in medicine is the ideal, such as deep into the human stomach. In fact, lasers based on fiber structure makes it possible in some devices. We can use the directional Guotai The advantages obtained in the form of fiber-optic beam splitter. This is to avoid fiber-optic system connecting the diffraction loss is very favorable. This can be done without leaving the fiber in the form of sub-light beam, this feature can be formed using all-fiber reflectors, interferometer and a resonant cavity. This design allows low-fiber laser operating off value, the output wavelength tuning and narrow lines are possible. Doped rare earth ion laser is an important character in the output spectral characteristics of their surrounding molecular ions by doping a significant environmental impact. Cause of this nature can take advantage of two features. One is by changing the glass matrix component to regulate that wavelength. The second is when the substrate is glass, you can observe the wide fluorescence. The agreement should be formed and signed at the end of pre-acceptance of green laser pointer .
Through the cavity structure shown in Figure 1-1 to improve, for example, with a wavelength reflector, you can get a wider range of 50nm or tunable laser output. Fiber laser output wavelength can provide many, some of which wavelength for optical communication is very important. Output wavelength of doped rare earth ions into the core of the decision. Segment of the spectrum and 1.55flm 1.33f4m output wavelength is the most important, because they correspond to the two low-loss optical communication window. 1.55 m of the output operation to defend the semiconductor device can be used as a pump source, so the means can be realized with lower cost value of the laser output. Currently, the use of fiber lasers have been 2-3 m wide defend the output of the laser line, the band's output in the lower loss in the infrared communication has a potential value. Some technical problems have been put forward during the final acceptance of green laser pointer .
No comments:
Post a Comment