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Study On Quasi-phase-matched Technology Based On Periodically Poled LiNbO3 And LiTaO3

Posted on:2005-10-05Degree:MasterType:Thesis
Country:ChinaCandidate:Y LuFull Text:PDF
GTID:2178360182475095Subject:Physical Electronics
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In this thesis we introduce quasi-phase-matching theory, characters and prospectfirstly. In chapter 2 of this paper, we present a brief overview of development ofTHz-wave technology on generations, detections, measurements and applications. Inthe next chapter, we focus on the THz-wave generation by nonlinear differencefrequency mixing. Two designs of THz generation are demonstrated.A new-style broadband light source was theoretically analyzed and its pump source,946nm Nd: YAG quasi-three-level laser, was investigated roundly and thoroughly inchapter 4. In the last part of the paper we demonstrated a continuous wave single-passextra-cavity frequency doubling by use of MgO doped stoichiometric lithium tantalite(PP-MgO: SLT). The maximum output of the second harmonic green light is 905mWwith the pumping power of 7.69W. The second harmonic conversion efficiency is11.77%.There following innovation points:1. We used nonlinear difference frequency generation in PPLN that directly utilizedall-solid-state laser such as Nd: YAG laser as the pumping source and signal togenerate THz radiation.2. To obtain THz generation we used an optical parametric oscillator with twoPPLN crystals in the same cavity to generate two signals as the source of DFG.3. We studied on diode-laser-end-pumped 946nm Nd: YAG laser in the operation ofcw and qcw then used the laser as the pumping source of PPLN-OPG. Also weobtained the SHG of 946nm laser.4. We realized dual-wavelength continuous wave laser operation at 1064nm and 946nm in Nd: YAG.5. We demonstrated a continuous wave single-pass extra-cavity frequency doublingby use of MgO doped stoichiometric lithium tantalite (PP-MgO: SLT).
Keywords/Search Tags:Quasi-phase-matching, THz-wave radiation, difference frequency generation, broadband light source, QPM-OPG, Periodically poled LiNbO3, 946nm Nd: YAG laser, periodically poled LiTaO3, second harmonic generation
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