Now, let me explain what was wrong with my green DPSS laser; honestly, first day when laser arrive to me, in one wrong maneuver with wires, laser felt down to floor. In this moment, I was not noticed anything strange with this laser. Later, I saw laser has less power than before, but when power began fade, I don't know. I was not suspect that something is broken inside laser, so only reason can be overheating because not use fan cooled heat sink, and maybe 808 nm laser diode is burned, or somehow work with less power.

Tonight collected enough courage and unscrew laser diode housing and inspect inside what can be wrong. Almost immediately saw one crack on 808 nm focusing lens (from LD to Nd:YVO4 crystal). Next picture show how it looks now:

Reason why output laser beam is much weaker than before is in fact that 808 nm laser diode is no more good focused onto Nd:YVO4 crystal, and thus can't reach enough power per square area. (This is maybe because this lens is little angled or moved closest or far from LD, so 808 nm laser spot is wider than usual, and thus power is spread to wide area instead to narrow spot to achieve maximum power.)

How looks crystal inside, captured with digital camera from output coupler side of laser (it's very hard job because camera lens is too big, and output coupler is too small, so go figure how to make picture.):

One look of 808 nm diode directly into digital photo camera. Note: I was turn pot little above lasing threshold to avoid damage of CCD sensor inside camera and my eyes as well. Also, by naked eye is quite visible deep red, not purple like at picture (I'm able to see also 950 nm LED from remote controller, but with adapted eyes in dark room.).