Green laser generation device, and portable electronic machine having laser projection display using the said device

A miniaturized green laser generation device which generates a green micro laser, comprising:

• an LD pump comprising a photo diode;
• a fundamental generator configured to generate infrared laser light according to the driving of the LD pump, the fundamental generator comprising an anisotropic gain crystal;
• a second harmonic generator configured to generate green light using the generated infrared laser light;
• a U-shaped metal spacer comprising a metal material and disposed between the LD pump and the fundamental frequency generator so that the LD pump and the fundamental frequency generator maintain a predetermined interval, wherein the metal spacer has a thickness of 50 μm to 100 μm;
• and
• a polarization maintenance unit disposed between the fundamental generator and the second harmonic generator and configured to prevent retrogressed light from entering the anisotropic gain crystal, wherein the polarization maintenance unit comprises an inserted green light absorber configured to absorb retrogressed green light, or a coated multilayer thin film configured to reflect the retrogressed green light.