The infrared technology of green laser pointer

In terms of high-energy pulse amplification amplification is difficult to achieve. In addition, the device in order to avoid non-linear, stretcher should have a large broadening ratio (typical value ≥ 1000:1) [4], but without distortion to facilitate the spectral shape of the pulse power amplification, which increases the difficulty of the laser design. Although the use of conventional diffraction grating that can be effectively pulse broadening and compression, but this type of stretcher / compressor is usually large and expensive and difficult to integrate, and on particularly sensitive to disturbance of the laser beam, which is ultrashort pulse fiber laser manufacturing is negative. The disassembly procedure of    green laser pointer      is easy actually.
Fiber laser damage for high-energy fiber laser system, we must consider the damage to the fiber end face problems. Laser damage of optical fiber end face is a complex process, which includes a wide range of mechanism. Due to the high-power femtosecond laser pulses in optical fiber end face has a very high optical power density, electric field leading to its super media avalanche ionization, and the resulting loss of fiber end face the other hand, high-repetition-rate femtosecond pulses, but also should consider the injury. Heat accumulation effect, this effect can melt or burst the fiber end. Although the mechanism of injury fiber end face are many, but the fundamental reason is the high end fiber laser power density, it is necessary for a solution. The quality inspection of  green laser pointer is indispensable.
High-power ultrashort pulse lasers limiting factor although the use of fiber laser technology has many advantages, but in the development of high power ultrashort pulse fiber lasers, there are several limiting factors should be considered. Nonlinear effects as power increases, resulting in smaller core in a high optical power density, long distance interaction with the fiber, the cumulative nonlinear effects become very obvious, which will pulse distortion, resulting in decreased pulse quality, and limit the peak power further. Non-linear impact can be expressed as [1] B = 2π l B n (z) I (z) dz 0 2 L (1) where l is the laser wavelength, 2 is nonlinear refractive index coefficient, n is the laser I intensity in the z-axis points along the beam path L, indicating B accumulated nonlinear phase shift. The analysis level of this    green laser pointer      company is at the world’s advanced level.
This nonlinear effect is the high-energy ultrashort pulse generation and transmission in the most basic. Typically, in order to avoid time-domain pulse shape and a serious distortion of the frequency domain, the following must be controlled in p. B On the other hand, by the Kerr nonlinearity in optical fiber due to self-focusing effect will limit the improvement of peak power femtosecond pulses. As the pulse intensity is higher than the center of the pulse wings, which will spotlight the laser pulse, and eventually shrink into a filament, resulting in a strong optical power density, making the optical media through the process of multi-photon ionization avalanche damage. For multimode fiber, the self-focusing effect of the damage threshold is [2] P cr = a l0 8π 2 nn 2 3 high-power femtosecond laser pulses in the current progress of the new high-power ultrashort pulse laser development, the chirp pulse amplification (CPA) technology is still a mainstream technology, the use of this technology has produced energy 1 mJ [5 ~ 7], hundreds of watts of average power femtosecond pulses. The machining process of green laser pointer is very advanced.
The main functional blocks of the technology include low-energy seed pulse, pulse stretcher, amplifier, pulse compressor and so on. For higher pulse peak power, the general multi-level chirped pulse amplification, the principle shown in Figure 1 [9]. 3.1 CPA technology used in the seed pulse and the power amplifier to use a relatively simple system to produce pulses as short as possible, CPA technology used in most low-energy seed pulse generation in passive mode-locking manner. Early ultrashort pulse oscillator is based on the nonlinear amplification loop mirror (NALMs) all-optical switching effect, which makes the system relatively complex, and later tend to use based on nonlinear polarization rotation effect has been more passive 8-shaped Clamping simple design [10]. The drawing of    green laser pointer      should be maintained in the good status.