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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1994),
  • paper CThL3

Compact pump cavity for diode pumped Nd:YAG lasers

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Abstract

The use of a pump cavity with a parabolic reflector allows transversal diode pumping with imaging properties without need for fast optics. This design takes benefit of the fact, that, although the beam quality is poor, the divergence is relatively low in the plane parallel to the junction, i.e., about 10° FW(1/ e2). In this plane the diode radiation is focused with a parabolic reflector into the laser rod. In the other plane the diode emission is simply confined without need of reducing the large divergence. This can be done either with two reflecting parallel plates, e.g., electro-gilded gold plates, or taking benefit of total internal reflection, e.g., inside a BK7 or Plexiglas slice. A schematic of the set-up using a BK7 slice is shown in Fig. 1. All reflecting surfaces are polished, the parabola shaped surface is silver coated. The water cooled rod is located in the focusing line of the parabola. A silver mirror is coated on the upper half of the outside of the cooling tube to reflect the residual transmitted pump radiation. The thinnest BK7 slice manufactured was 2 mm thick, a Plexiglas slice in use was 8 mm.

© 1994 Optical Society of America

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