We know that Earth creatures can generate high-voltage electricity (your nearest electric eel can attest to that). We also know that ordinary air at Earth atmospheric pressure can be used as a laser gain medium -- this is used in Transverse Excitation at Atmospheric pressure (TEA) laser designs. While not capable of CW output, such a laser can produce pulsed output at a high enough frequency to be practically equivalent to a CW laser, in addition to being operated in a single pulse mode.

This leads me to the question, similar to this but for land-bound creatures: could a creature on land generate a laser pulse without the need for assistance from non-biological structures (such as the finely spaced optics used in the chemically pumped GFP-laser cell)? Furthermore, how much power could they feed such a bio-laser with?

We know that Earth creatures can generate high-voltage electricity (your nearest electric eel can attest to that). We also know that ordinary air at Earth atmospheric pressure can be used as a laser gain medium -- this is used in Transverse Excitation at Atmospheric pressure (TEA) laser designs. While not capable of CW output, such a laser can produce pulsed output at a high enough frequency to be practically equivalent to a CW laser, in addition to being operated in a single pulse mode.

This leads me to the question, similar to this but for land-bound creatures: could a creature on land generate a laser pulse without the need for assistance from non-biological structures (such as the finely spaced optics used in the chemically pumped GFP-laser cell)? Furthermore, how much power could they feed such a bio-laser with?