Study On Electro-optic Q-switched Nd:YAG Frequency Doubling Laser At 660nm

During these years, red lasers have been used in many fields more and more widely, including laser display,laser print. These applications have great prospect. As one of the most important red lasers, 660nm red laser is a hot spot for many researchers all over the world. However, most of the reports about the 660nm red laser focus on continuous wave ( CW) or Quasi-CW output. In some special fields, such as laser medical treatment, huge pulse energy and short pulse duration are needed. Nowadays, there are not enough research in this aspect, so it is necessary to have a study in 660nm pulse output, this paper get a satisfactory result by making a original model, which form the basis for the further development of the high power and high energy 660nm red laser. Some major work in this paper is as follows:1. The optical theory basis of 660nm red laser is detailed analyzed and designed, including the principle of choosing laser gain medium, the method of achieving 1319nm laser oscillation, choosing Q-switched crystal and calculating the voltage of crystal, choosing the frequency doubling crystal and so on. And in the end, the rate equation of intracavity frequency doubling Q-switched laser is analyzed.2. The electrical basis is demonstrated in this chapter, the disadvantages of traditional Xenon lamp power are eliminated. LCC resonant converter is adopted depending on the load character of Xenon lamp, and by choosing the double winding, which can supply the high voltage and the low voltage separately, the small size and high efficiency of the Xenon lamp power supply are realized. In addition, the factors affecting the efficiency of Xenon lamp simmering are analyzed.3. The Nd:YAG crystal combined with electro-optic Q-switched is adopted to eradiate 1319nm fundamental wave , then by using the intracavity double-pass frequency doubling with KTP crystal(Type II phasing matching, ? = 0 ?,? = 59. 8?), a single-pulse energy of 56mJ, pulse duration of 45ns, peak power of 1.24MW at 660nm is obtained. In addition, the double-pulses output and long pulse output is experimented by changing the way of discharging and the pump.