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Cr ~ (4): Mg_2SiO_4 as the laser gain medium and the saturable absorber
Author: ZhuangZuoWei
Tutor: WangJiaXian
School: Huaqiao University
Course: Physical Electronics
Keywords: Cr4+:Mg2SiO4 laser Gain-switching Mode-matching Saturable Absorption Second-harmonic red laser
CLC: TN244
Type: Master's thesis
Year: 2006
Downloads: 62
Quote: 0
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Abstract
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The development of the Cr4+–doped crystals and successful working of pertinent lasers extend the tune of solid tunable lasers from 0.7μm～1.0μm generated by Cr3+ and Ti3+ ions to 1.0μm～1.8μm ,so the study of them has become the hot pot of the study of solid tunable lasers. Especially the Cr4+:Mg2SiO4 crystal will hopefully become the ideal medium of solid tunable lasers in the near infrared wavelength, in addition, the second-harmonic red laser generated by Cr4+:Mg2SiO4 laser can conquer the shortcoming of diode laser, and Cr4+ ion was found that it has the characteristic of saturated absorption at 0.9μm～1.2μm ,so the study of it will be the most important.In this thesis, we used the Q-switched Nd:YAG laser pulse focused by lens to pump the Cr4+:Mg2SiO4 crystal, with the pump laser pulse duration and energy of 30ns and 50 mJ separately, and got the laser pulse with center wavelength, pulse duration and energy of 1.22μm , 8.2 ns and 10 mJ on the best work condition. On the base of Zhangguowei′s approximation about gain-switching and the parameter of Cr4+:Mg2SiO4 crystal, we calculated the time characteristics of Cr4+:Mg2SiO4 laser pulse with rate equation by numerical method, obtained the conclusion that the laser pulse duration is only related to the pump energy and cavity length: the larger the pump energy is, the narrower the pulse duration is; the longer the cavity is, the wider the
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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Laser technology, the maser > Laser materials and substances
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