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Chinese Physics, 2003, Vol. 12(11): 1246-1250    DOI: 10.1088/1009-1963/12/11/311
CLASSICAL AREAS OF PHENOMENOLOGY Prev   Next  

The mechanism research of the Cr4+Nd3+:YAG laser

Chen Xiao-Bo (陈晓波)a, Wang Ling (王凌)a, Lü Lan-Bin (吕兰斌)b, Zhang Zhi-Guo (张治国)b, Zhu Jane G.c, Du Wei-Min (杜为民)c, Yang Guo-Zhen (杨国桢)b
a Applied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, China; b Laboratory of Optical Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; c Physics School, Peking University, Beijing 100871, China
Abstract  The 946nm diode-pump microchip self-Q-switched laser of a chromium and neodymium codoped yttrium aluminum garnet crystal material (Cr$^{4+}$Nd$^{3+}$:YAG) is studied, especially about its physical mechanism of operation. The ${}^4$F$_{3/2}→{}^4$I$_{9/2}$ transition of Nd$^{3+}$ ion is beneficial to achieving laser oscillation in a quasi-three-level system based on coating the cavity mirrors of the microchip with films that suppress the 1064nm operation and enhance the 946nm laser. The Cr$^{4+}$ ion is a saturable absorber. The initial loss $N_{\rm t1}$ is high, which acts as the threshold for laser oscillation. The stable loss $N_{\rm t2}$ is low because the Cr$^{4+}$ ion is acceleratively bleached by the fast enhancement of the oscillating laser. The high N$_{\rm t1}$, small $N_{\rm t2}$ and fast progresses permit the oscillating laser of the Cr$^{4+}$Nd$^{3+}$:YAG to have a good self-Q-switched property whose full width at half maximum is about 4.2ns. Its highest laser power is about 5.7mW. Its peak power is about 150W. Its good fundamental transverse TEM$_{00}$ mode results from the absorption bleaching established by both the pump and oscillating lasers, which suppress other transverse mode and allow the oscillation only in the fundamental transverse TEM$_{00}$ mode.
Keywords:  self-Q-switched      946nm laser      Cr$^{4+}$Nd$^{3+}$:YAG  
Received:  14 March 2003      Revised:  02 June 2003      Accepted manuscript online: 
PACS:  42.55.Sa (Microcavity and microdisk lasers)  
  42.60.Gd (Q-switching)  
  42.70.Mp (Nonlinear optical crystals)  
  42.55.Rz (Doped-insulator lasers and other solid state lasers)  
  42.60.By (Design of specific laser systems)  
  42.70.Hj (Laser materials)  
  78.30.-j (Infrared and Raman spectra)  
  42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 19874033 and 10174008).

Cite this article: 

Chen Xiao-Bo (陈晓波), Wang Ling (王凌), Lü Lan-Bin (吕兰斌), Zhang Zhi-Guo (张治国), Zhu Jane G., Du Wei-Min (杜为民), Yang Guo-Zhen (杨国桢) The mechanism research of the Cr4+Nd3+:YAG laser 2003 Chinese Physics 12 1246

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