Experimental study of diode laser end-pump Nd:YVO_4/KTP solid laser

A diode laser end-pumped Nd:YVO4/KTP solid laser experimental system is built.The system starts from a single diode laser with center output wavelength at 808.5 nm to end-pump Nd:YVO4 laser crystal and produce 1 064 nm infrared laser,which is then swithed to 532 nm green laser through intracavity frequency-doubling by a KTP crystal inside the laser cavity.The relationship between 808.5 nm diode laser output power and the injection current,and the relationship between diode laser pump power and 532 nm green laser output power is studied by experiments.The influencing factors of the 532 nm green laser output power,including the phase-matching angle of KTP frequency-doubling crystal,the pump laser focus to the Nd:YVO4 laser crystal position,and the length of solid-state laser cavity are also studied and analyzed.The experimental results demonstrate that the output power of 532 nm green light can be enhanced through increasing the pump diode laser output power,or decreasign the length of solid laser cavity,or turning the pump diode laser focus into the Nd:YVO4 laser crystal,or adjusting the KTP crystal phase-matching angle correctly.