The certification of green laser pointer

In general (Nd: YAG laser, for example), LD / LDA electro-optical conversion efficiency of 30% -50% to ND: of YAG light - optical conversion efficiency of about 40%., LD / LDA-pumped The ND: YAG laser efficiency above 10%. Secondly, the absence of flow fluctuation noise of the liquid or gaseous substances, as well as the pump light of the plasma fluctuation noise, the noise characteristics of the LD-pumped solid-state lasers than light pump The pump is better than the first order, and frequency stability. pump source for LD / LDA-pumped solid state lasers, but also with other types of lasers can not match the characteristics of, for example: (1) long life. The customer would like to check the materials item by item according to the material list ofgreen laser pointer.
LD life of up to tens of thousands of hours or longer, require frequent replacement. Small thermo-optical distortion in (2) (3) The beam quality (4) reliability than lamp-pumped 100-fold increase (5) weight light (6) simple structure and so on merit. In addition, in principle, a variety of lamp-pumped solid-state lasers can be replaced by diode-pumped. These advantages make the LD-pumped all-solid-state lasers have become the international race to develop hot spots. 2.3.2 side of the pump pump (pump), pump, also known as pump, pump; with the pump, pump the word appeared in the laser field. lasers external energy is usually in the form of light or current input to the laser-generated media into, in the electronic ground state, the incentive to a higher level energy state (the "pump" the word to describe this process (as water from the lower pumping uphill))) physicists will in this state is called excited state (excited state) diode-pumped laser can be divided into two forms of end-pumped and side-pumped. Test result of green laser pointer sample is good enough.
End-pumped device is simple pump beam and cavity mode matching the working material of the pump light absorption is very full, thus the end of the threshold power, slope efficiency side of the pump means a pump light from the side-pumped laser crystal, ie light irradiated from the side into the laser rod. Typically, the order to the to the high-power laser, commonly used semiconductor array to do the pump source, the array of light-emitting surface, the laser by the side of the total reflection in the work material transfer, so that its larger than the material shape of the effective length of the gain medium length, to obtain high power output. Therefore, in order to obtain high-power laser output. will generally side-pumped + 2.3 2.3.3 LD-pumped solid-state laser development of the earliest solid-state lasers using flash as the pump source, the width due to the emission spectrum of the flash. The sales strategy ofgreen laser pointershould be improved.
The absorption of the solid laser medium with a very narrow, so the conversion efficiency is very low, the main factors in the period of time constraints the development of solid-state lasers .1962 years, the advent of the first homojunction gallium arsenide semiconductor laser for DPSSL material basis; one year after the Americans Newman first proposed the idea of using semiconductor diode laser pump source. and GaAs diode radiation in the 808nm near to the pumped Nd: CaW4 recognized, stimulated fluorescence has been 1.06 Lin μm output. Newman, recognized that the development of high efficiency GaAs diode laser emission wavelength with the Nd3 + ion pump absorption band spectral overlap, the structure of compact solid-state lasers .1964, Keyes and Quist of MIT Lincoln Laboratory in the United States successfully achieved This idea, developed the first LD pumped solid-state lasers. The marketing center ofgreen laser pointeris holding the meeting to analyze the market of green laser pointer.
Laser material for the U3 +: GaF2 1968, Mai airline Ross realized the first GaAs LD-pumped ND: YAG laser required the LD must be cooled to 170K in order to achieve wavelength match with semiconductor laser at room temperature under continuous work, 1971, Ostermeyer reported room temperature, the LD-pumped ND: YAG, to obtain 1.4mW l064nm laser output; 1972, Danielmeyer at room temperature semiconductor laser pumping of Nd: YAG ; 1974 Conant, who pumped ND: YAG diode laser array, but at the time, due to the stability of the early LD, low conversion efficiency, life span than a flash short. The certification of green laser pointer is the important checking point.