A solid-state laser apparatus including a cavity having an output mirror (103) and a reflective mirror (104), a laser Er:YAG medium (101) and an excitation lamp¨(102) disposed inside the cavity, a wavelength selector (106) allowing selection of a wavelength for laser light pulses to be emitted from among a plurality of wavelengths, and a laser emission timing controller - e.g. a Q-switch - (105) controlling emission timing of the excitation lamp, emission energy of the excitation lamp that is determined depending on at which wavelength, of the plurality of wavelengths, the pulses are to be emitted, and emission of the pulses. The controller continuously emits a pulse train formed of a plurality of pulses including pulses of at least two wavelengths.