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Active–passive mode-locking using Cr4+:YAG crystal as saturable absorber

✍ Scribed by Leng Yuxin; Lu Haihe; Lin Lihuang; Xu Zhizhan

Book ID
104159618
Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
174 KB
Volume
33
Category
Article
ISSN
0030-3992

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✦ Synopsis

Cr 4+ : YAG crystal was used as a saturable absorber in an active-passive mode-locked Nd : YAG laser. The stable and complete mode-locked pulse train was achieved at 1064 nm. The duration of a single pulse was obtained from 0.8 to 2:4 ns by changing the Cr 4+ : YAG crystal with di erent initial transmission, when there was the shortest pulse width. The mode-locking dynamic process of Cr 4+ : YAG crystal was analyzed by the rate equations to explain the experimental result, and the e ect of excited-state absorption was considered.

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By considering the Gaussian spatial distributions of the intracavity photon density and the initial populationinversion density, the coupled rate equations for a diode-pumped passively Q-switched and mode-locked (QML) laser with Cr 4+ :YAG saturable absorber are given. These coupled rate equations a