Fig. 3. (Color online) (a) Propagation of laser beam after output coupler. The laser beam is collimated by a lens with focal length f₁. (b) Layout for measuring thermal lens focal length by double passing a He-Ne laser beam through a Nd:YVO₄ crystal.

New Phys.: Sae Mulli 2023;73:304~310 https://doi.org/10.3938/NPSM.73.304

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