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Search On The Pulse Characteristics Of Diode-pumped Solid State Lasers Doped With Neodymium

Posted on:2012-11-10Degree:MasterType:Thesis
Country:ChinaCandidate:Y LiuFull Text:PDF
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Diode-pumped solid-state lasers have become a focus in the field of lasers research. Because they have many advantages, such as high stability, high efficiency, high power, compactness, and long lifetime and so on. They have been widely used in many fields such as military, scientific research, medical treatment, and photoelectrics industry and so on. In this paper, we have made experimental research around diode-pumped solid state doped with neodymium by the two methods of Q-switched and mode-locked. We have achieved the aim of laser pulse with short duration, high efficiency, high peak power, high stability. The main content can be generalized as follows:1. We introduced the properties of laser crystals doped with neodymium such as Nd:YAG, Nd:GdVO4, Nd:YVO4. Cr4+:YAG, Co2+:MgAl2O4 (Co2+:MALO) and single-walled carbon nanotubes (SWCNTs) are three kinds of the saturable absorbers. The properties and the applications of them were introducted. The applications of diode-pumped solid state lasers doped with neodymium are simple reviewed.2. The theory of the Q-switched lasers was given in this paper. A diode-pumped Nd:YAG Q-switched lasers at 1064nm with an acoustic-optical modulator (AO), Cr4+:YAG saturable absorber and both of them in the cavity were demonstrated. Under the doubly Q-switched laser operation, the laser generated stable pulse width of 8ns with the average output power of 1.894 W. The maximum peak power was 23.6 kW.3. Basing on the theory of passively Q-switched laser at 1.34μm, passively Q-switched output of a diode-pumped Nd:GdVO4 laser at 1.34μm by using Co2+:MgAl2O4 crystal as the saturable absorber was demonstrated. Compared with the pulse characteristics by using different transmissions of output mirror, we have demonstrated the shortest pulse width when the transmission of output mirror is 15 %. The shortest pulse width is 110ns.4. The principle of the mode locked lasers was given in this paper. By using SWCNTs as the saturable absorber, we have demonstrated a high power Nd:YVO4 mode-locked laser. The pulse laser with pulse duration of 7.6 ps and a repetition rate of 96 MHz has been obtained. The maximum average output power is 3.6 W under the pump power of 12 W. The peak power and the single pulse energy are high to 4.9 kW and 36 nJ, respectively.
Keywords/Search Tags:All solid state laser, Nd:YAG, Nd:GdVO4, Nd:YVO4, 1.34μm laser, Co2+:MALO, SWCNTS, Q-switching, mode-locking
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