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Passively Mode-locked Side-pumped Nd: YAG Laser With SESAM

Posted on:2008-08-17Degree:MasterType:Thesis
Country:ChinaCandidate:X LiFull Text:PDF
GTID:2178360242498689Subject:Optical Engineering
Abstract/Summary:PDF Full Text Request
Passively mode-locked technology, utilized in generating laser pulses with ultrashort duration, high repetition rate and high peak intensity, has more applications in high-capacity telecommunication systems, nonlinear frequency conversion, laser spectroscopy, and optical coherence tomography(OCT) etc. By the year of 1992, the invention of Semiconductor Saturable Absorber Mirror (SESAM) brought a revolution in the passively mode-locked solid state laser. Passively mode-locked laser with SESAM have developed rapidly for its inexpensive, compact, self mode-locking, self starting, and so on.Based on the theory of SESAM mode-locking, a passively mode-locked Nd:YAG laser with SESAM was constructed, which realized continuous mode-locking of maximum average power of 4.7W. It is the highest record of the same kind lasers in China. The paper is summarized as follows:1. The progress is reviewed of mode-locked laser with SESAM, especially focused on the development of passively mode-locked Nd:YAG laser.2. With the optical characterization and structure of SESAM , the stability criterion of continuous wave mode-locking derived from rate equations is discussed. The principle and phenomenon of passively mode-locked laser with SESAM is described.3. The theory and experiment on the thermal effect is introduced. After measuring the thermal focal length of the LD side-pumped Nd:YAG laser module accurately , the compensation method is discussed.4. According to the principle of continuous mode-locking and the performance of the Nd:YAG laser module, Suitable SESAM has been chosen, Different kinds of laser cavities are designed and analyzed with the ABCD matrix.5. A SESAM continuous passively mode-locked Nd:YAG laser is constructed successfully. The power, beam quality and other performance of laser is measured. Finally, the damage on the SESAM and the improvement of the laser are discussed.
Keywords/Search Tags:solid laser, passively mode-locked, SESAM, side-pumped, Nd:YAG
PDF Full Text Request
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