Microsecond red laser pulses via overcoupled intracavity second harmonic generation

In the present paper, a setup of Nd:YAG laser operated at 1.32 μm with intracavity second harmonic generation is presented. In the overcoupled regime at the output, the laser allowed to achieve red pulses at wavelength of 0.66 μm with variable duration ranging from several hundred nanoseconds to about 3 microseconds. The optical scheme of the laser is discussed.