Laser processing device and laser ablation equipment

The invention provides a laser processing device. The laser processing device comprises a first nonlinear crystal, a wave plate and a second nonlinear crystal, the first nonlinear crystal is used for transmitting a first beam of photons with a first frequency and converting the first beam of photons into a second beam of photons with the first frequency and a second frequency, the first frequency is about twice of the second frequency, and the photons with the first frequency and the photons with the second frequency oscillate in mutually orthogonal polarization directions; the wave plate is used for transmitting the second beam of photons and rotating the polarization direction of the second beam of photons to convert the second beam of photons into a third beam of photons, so that the photons with the first frequency and the photons with the second frequency oscillate in the basically same polarization direction; the second nonlinear crystal is used for transmitting the third beam of photons and converting