45 deg. oblique axis pumping method and pumping module for strip shaped laser crystal

Abstract

This invention relates to a pumping method for a 45deg. clino-axis and a pump module, which combines the advantages of parallel optical axis pump and vertical optical axis pump and puts forward a 45deg.clino-axis pump method and a pump module. Since the pump light is transmitted in zigzag in the crystal, it ensures the uniformity of the pump and full absorption of the crystal to pump lights, it's more suitable for solid laser materials with low absorption coefficient and fine output beams, besides, the total reflection of the 45deg. can reduce the interface reflection loss and cost of a laser crystal, the coupled face of 45deg. cutting increases the coupled face by 1.4times, move pump lights are coupled in.

Description

technical field [0001] The invention relates to a 45° oblique-axis pumping method and a pumping module for a slab-shaped laser crystal, belonging to the technical field of lasers. Background technique [0002] At present, there are two main pump coupling methods for laser diode-pumped solid-state lasers—parallel optical axis pumping and vertical optical axis pumping. The parallel optical axis pumping refers to the pump coupling method in which the pump optical axis is parallel to the laser exit optical axis; the vertical optical axis pump refers to the pump coupling method in which the pump optical axis is perpendicular to the laser exit optical axis. These two pump coupling methods have their own advantages and disadvantages. In the parallel optical axis pumping, the mode matching between the pump light and the laser is better, and the light output efficiency and beam quality are relatively high, but the power expansion is limited by the light power density of the incident...

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Problems solved by technology

However, this solution requires four-corner pumping and four-sided bonding, and the process is complicated; none of the adjacent eight small faces has the same coating, and most of them are two-color films, so the coating process is complicated and the cost is high.

All the pumping methods can be attributed or approximately attributed to the parallel optical axis pumping, vertical optical axis pumping and angle pumping structure, no case has been proposed or used to couple the pump light into the laser crystal from both ends of the laser crystal, and The pump light is neither parallel nor perpendicular to the laser exit optical axis, forming a zigzag pump light path with an angle of approximately 45°

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