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All‐fiber actively Q‐switched Er 3+ /Yb 3+ co‐doped ring laser
Author(s) -
Zhang ShuMin,
Lu FuYun,
Wang Jian
Publication year - 2007
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.22692
Subject(s) - materials science , interferometry , optics , fiber laser , pulse width modulation , laser , pulse (music) , microwave , power (physics) , modulation (music) , signal (programming language) , q switching , optoelectronics , physics , telecommunications , engineering , acoustics , computer science , quantum mechanics , detector , programming language
We report on a all‐fiber actively Q‐switched laser based on a Mach‐Zehnder interferometer (MZI). One of the arms of the MZI is bonded on a piezoelectric transducer (PZT). The path length difference between those two arms will change when a RF electric signal is applied drives the PZT, allowing control of the Q‐factor of the cavity and, thus, performing active Q‐switching. Using Er 3+ /Yb 3+ co‐doped fiber (EYDF) and a maximum pump power of 712 mW, Q‐switch pulses with peak power of 2.2 W and pulse width of 1.2 μs were obtained. Furthermore, our result also shows that, to generate stable Q‐switched‐pulses, with different pump power, one must select different modulation frequency, this phenomenon is experimentally proved for the first time to our knowledge. The pulse repetition rate of the laser can be adjusted from few Hz up to 25 kHz. © 2007 Wiley Periodicals, Inc. Microwave Opt Technol Lett 49: 2183–2186, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.22692