• DocumentCode
    917380
  • Title

    Doubly Passively Self-Q-Switched Cr4+:Nd3+:YAG Laser With a GaAs Output Coupler in a Short Cavity

  • Author

    Yang, Kejian ; Zhao, Shengzhi ; Li, Guiqiu ; Li, Dechun ; Wang, Jing ; An, Jing ; Li, Ming

  • Author_Institution
    Sch. of Inf. Sci. & Eng., Shandong Univ.
  • Volume
    43
  • Issue
    2
  • fYear
    2007
  • Firstpage
    109
  • Lastpage
    115
  • Abstract
    By using a GaAs as both an output coupler and a saturable absorber, we present a doubly passively self-Q-switched Cr4+:Nd3+:YAG laser in a short cavity for the first time to our knowledge. This laser can generate more symmetric pulse shape and shorter pulsewidth in comparison with the solely self-Q-switched Cr4+:Nd3+:YAG laser. The output pulse energy and peak powers are higher than those in our previous doubly passively Q-switched lasers. By considering the Gaussian spatial distribution of the intra-cavity photon density and the free carrier absorption (FCA) in GaAs wafer, a set of modified rate equations have been introduced to describe the performances of the doubly Q-switched Cr 4+:Nd3+:YAG laser with GaAs coupler. The numerical solutions of the equations and the experimental results are found to agree with each other very well. The effect of FCA process in GaAs wafer has been discussed and proved to play an important role in the pulse compression and symmetry
  • Keywords
    III-V semiconductors; Q-switching; chromium; gallium arsenide; laser cavity resonators; neodymium; optical couplers; optical pulse compression; optical pulse generation; optical saturable absorption; solid lasers; Cr4+:Nd3+:YAG laser; GaAs; GaAs output coupler; GaAs wafer; Gaussian spatial distribution; YAG:Cr,Nd; YAl5O12:Cr,Nd; doubly passive self-Q-switching; free carrier absorption; intracavity photon density; modified rate equations; optical pulse compression; optical pulse symmetry; saturable absorber; short laser cavity; symmetric pulse shape generation; Chromium; Equations; Gallium arsenide; Neodymium; Optical coupling; Optical pulse generation; Optical pulse shaping; Optical pulses; Shape; Space vector pulse width modulation; ${hbox {Cr}}^{4+}{hbox {:Nd}}^{3+}{hbox {:YAG}}$ crystal; doubly $Q$-switched; passively $Q$-switched; self-$Q$ -switched laser;
  • fLanguage
    English
  • Journal_Title
    Quantum Electronics, IEEE Journal of
  • Publisher
    ieee
  • ISSN
    0018-9197
  • Type

    jour

  • DOI
    10.1109/JQE.2006.886811
  • Filename
    4049869
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=917380