A novel LD side-pumped Nd:YAG Q-switched solid-state laser, which made use of the special pumping strcture with
conductive cooling instead of water cooling, was investigated.After selecting an appropriate length and diameter of
Nd:YAG laser crystal rod and using three groups of laser diode centimeter bar which was composed by 12 laser diodes
and uniformly arranged according to the angle of 120°,side-pumping structure of laser was accomplished.Adopting
plano-concave resonator ,mending double end face of laser crystal and designing heat-stability resonator made the
resonator steadily oscillate.Laser crystal rod which was tight fastened by copper net was conductively cooled and
radiation block was furnished on the external of copper net for increasing the radiation capacity.High reflection gold
film was plated on the cooling wall in the opposite way of pumping light, so that the laser crystal was uniformly pumped
and the laser with low order mode output.Making the use of pillar lens focus and ray trace computing, reasonable
parameters were caculated to couple pumping light to laser with high-efficiency.It was the electrooptic Q-switched which
was made to be micro-integration eliminating voltage by KD*P crystal that improved the ratio between acting and
unacting.Inner heat radiated from laser in good time with TE cooler and the laser ran at constant temperature with water
cooling when the big external heat sink emanated a steady heat to periphery. Experiments revealed that the syetem
pumping efficiency riseed by 18% and the laser threshold energy was 192 mJ under the condition of this novel
pumping structure. The low mode output of 10~12ns pulse width and the maximum output energy of 98 mJ was
achieved with an incident pump energy of 720 mJ in 1064nm.The optical-to-optical conversion efficiency was up to 13.
6 %,and the power instability in 24 h was better than ±1. 7 %.
In order to raise the accuracy of glass carving and improve deep cutting, a novel diode end-pumed solid-state laser is
researched. Selecting proper volume of laser crytal, one continue wave laser diode which longitudinally pumped Nd:YAG
crystal is performed and an applied optics coupling system is designed with self focusing.Computing with ray trace
software and MATLAB software, the best parameter is obtained, so pumping beam is coupled efficiently to
Nd:YAG.Used a Cr4+:YAG crystal with the singnal transmission of 82% and a line plane-concave cavity, nanosecond
narrow pulse is gotten. After two thermal-electrical coolers kept the laser to work at constant temperature instead of
water cooling, the volume of laser is markedly reduced. The method of thermal-electrical cooling could increase the
system efficiency,achieve the effect of low mode output.Experimental results indicate that the maximum laser output
energy in 1064 nm is 118mJ,pulse width is 5 ns, conversion efficiency from light to light is 15.7% under the condition of
the incident power of 5 W and the diameter of the output laser spot is less than 1 mm. This end-pumped Nd:YAG
Q-switched laser with the light output of high quality and long life, which has 0.01 mm accuracy after lens focusing can
satisfy the glass carving with higher precision, rapid speed as well as easy control. It can be used in carving all kinds of
glass and replace current CO2 laser.
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