The General Manager Has Planned The Production Task Of Green Laser Pointer

The general manager has planned the production task of green laser pointer
To reduce the particle density and size, researchers have proposed many solutions for droplets from the source to reduce the generation or transmission of material in the ablation process to reduce the deposition of droplets to the substrate [12]. The first is the use of high density of the target, and target selection of laser wavelength with high absorption, because the droplets in the case when the laser penetrate deeper target more serious. Target of the laser absorption coefficient is larger, as a source of molten droplets sprayed layer thinner, resulting in lower density of droplets. Second, due to particles produced by PLD than the rate of atoms, molecules of an order of magnitude lower rate, it can be different based on the rate of mechanical shielding techniques to reduce particulate matter. Most items of 200mW green Laser Pointer agreement has been determined.
Commonly used methods are: 1) between the target and substrate plus a rate of screening (volecity filters), so only the rate is greater than a certain value of the material deposited on the substrate by and, while the slower rate of particulate matter were blocked down; 2) off-axis laser deposition (off-axis laser deposition), the substrate and target different axis (axis not parallel or perpendicular) to the thin film deposition, through ablation material particles and between particles and particles with the atmosphere collide with the larger scattering to reduce the deposition of particles to the substrate [13]; 3) targeting the shadow mask version (line-in-sight shadow masks), Mask through coaxial to stop the droplets reach the substrate ; 4) between the target and substrate plus a deflection electric or magnetic field to reduce the deposition of droplets, and so on. The customer has been using various green laser pointer  and the customer thinks our green laser pointer is of the best quality.
Reduce particulate matter pollution in other deposition techniques are: 1) two-beam laser deposition technique (dual-beam pulsed laser deposition), using two lasers or by splitting a laser beam to obtain two laser beams, a beam of light to let the deposition partial melting of the target surface, and then let the other beam of light exposure so that the molten zone into the plasma, thereby reducing the generation of droplets. Mukherjee and other first with pulsed CO2 (10.6 ? m, 200ns) laser to a shallow surface melting without evaporation of the target, followed by KrF (248nm, 20ns) pulsed excimer laser evaporation of the molten zone plasma, resulting in particle density of Y2O3 thin film deposition reduced by 3 orders of magnitude [14]. The contract of green laser pointer should be obeyed rigidly.
Cross-beam deposition technique (cross-beam technique), so that two beams of laser light from different angles simultaneously to their respective targets on their bombardment of the ablated material in a certain area and cross-interaction (collision, scattering, reaction, etc.), By attaching a diaphragm, you can create a region without particles, the substrate placed in the region, you can get high-quality particulate pollution-free film. Shown in Figure 5-4. However, this technique requires two lasers to precisely synchronized in time, the equipment is very complex. Although these mechanical methods to reduce particulate pollution deposited films have a certain effect, but also the expense of the advantages of PLD high-energy, greatly reducing the film deposition rate. Essence of the solution from the laser and target interaction of the physical process of working, in-depth study of droplet generation mechanism, and then adjust the deposition parameters, film radically reduce particulate matter pollution. The customer wants to add some more clauses to 50mW green laser pointer agreement.
Over time, the newly developed laser technology to reduce particulate pollution quite successful, such as the use of new ultra-fast pulse (picosecond and femtosecond) laser. Ultrafast pulsed laser deposition technique (ultra-fast pulsed laser depostion) low pulse energy (micro-focus magnitude) and high repetition rate (tens of megahertz) to achieve high-quality film growth. Each of these low-energy high-intensity pulses can only be a relatively small amount of evaporation (~ 1011-1012) of the atom, and thus the expansion in the fast non-equilibrium process can prevent the generation of large density of particles [15]. The application of femtosecond laser does essentially reduces the density of particles [16]. State in the femtosecond laser pulse of energy consumed in the moment of breaking chemical bonds, will not produce thermal effects. The lower price can be provided for 100mW green laser pointer if the order is large enough.