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4.2 SEEDER/HOST SYSTEM SERVICE
Any service concerning the host laser optics should be performed with an awareness of the
potential impact on the injection seeder and the injection seeding process. Common examples are
given below.
• Changing the host laser's Nd:YAG rod requires checking the frequency overlap between the
seed and host lasers. Also, the new rod will have different focusing characteristics, and this
will warrant a check of the spatial mode overlap.
• Changing the polarizer may require realigning turning mirrors. See Section 2.
• Changing the Pockels cell would necessitate a check of the Pockels cell voltage.
• Changing or realigning the Pockels cell, polarizer, or Nd:YAG rod requires realigning the
quarterwave waveplates around the Nd:YAG rods.
These are just a few examples which illustrate the coupling of the seeder and the host laser. A
general awareness of how changes in the host optics can impact injection seeding combined with an
appropriate execution of the necessary checks/adjustments should suffice to keep the host laser and
the injection seeder working well together.
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