Great-power laser diode array pumping cavity for pumping solid laser

Abstract

The present invention one kind of great-power laser diode array pumping cavity for pumping solid laser. The pumping cavity includes one heat rectangular sink with through hole in the center; an insulating ring set in the through hole; several laser diode array stripes and several arced electrodes, which constitute cylinder with high-reflectivity cylindrical inner surface as pumping cavity, mounted onto the inner surface of the insulating ring; positive and negative electrodes connected to one section of arced transition electrode and led beyond the heat sink; and cooling water passage around the through hole and led out via water pipes.

Description

technical field [0001] The invention relates to a pump cavity of a high-power laser diode array pumping a solid-state laser, and is especially suitable for a high-power laser diode array side-pumping solid-state laser. Background technique [0002] In high-power laser diode array pumped solid-state lasers, such as 808nm high-power laser diode array pumped solid-state lasers, how to make the pumping light absorbed by the pumped crystal as much as possible is one of the most critical technologies. Because the divergence angle of the output light of the laser diode array is very large (full width at half maximum is 40°×10°), it may happen that the pump light does not fully irradiate the crystal, and some of it irradiates outside the crystal and is not absorbed by the crystal. ; In addition, the primary absorption of the pump light by the crystal is incomplete, and the unabsorbed pump light is absorbed by the laser diode heat sink or other components. These problems will direct...

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Problems solved by technology

These problems will directly lead to reduced pump efficiency and increased heat loss, requiring more powerful refrigeration

[0003] Now, in the common high-power laser diode array pumped solid-state laser, the output cavity surface of the laser diode array is very close to the crystal, so that the pump light with a large divergence angle can fully illuminate the crystal, but the crystal The diameter is limited. In order to dissipate heat, the size of the heat sink of the high-power laser diode array cannot be small, so that many laser diode arrays cannot be arranged around the crystal to prevent the power density of the pump light from increasing; A light compression lens is added in front of the laser diode array to make the divergence angle of the output light of the laser diode array smaller so that the pump light energy can fully irradiate the crystal, but this method increases the cost of the system, complicates the structure and reduces the reliability

In order to solve the secondary absorption of pump light, the usual practice is to face the laser diode array and place a reflector on the other side of the crystal, which will also increase the cost of the system, complicate the structure, and reduce reliability.

Therefore, in the current high-power laser diode array pumped solid-state lasers, there are many components, complex structures, small tolerances, and high costs, which are not conducive to engineering and mass production.

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