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New octagonal shape double-clad Thulium-Ytterbium Co-doped fiber for generation of multi-wavelength and Q-switched lasers in 2 micron region

Z. JUSOH1,2, N. KASIM3, Y. MUNAJAT3, H. AHMAD4, S. W. HARUN1,4,* , A. HALDER5, M. C. PAUL5,* , M.PAL5, S. K. BHADRA5

Affiliation

  1. Department of Electrical Engineering, Faculty of Engineering, University of Malaya 50603 Kuala Lumpur Malaysia
  2. Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM), 40450 Shah Alam Malaysia
  3. Advanced Photonics Science Institute, Faculty of Science, University Technology Malaysia, 81310 Skudai, Johor, Malaysia
  4. Photonics Research Centre, University of Malaya 50603 Kuala Lumpur, Malaysia
  5. Fiber Optics and Photonics Division, Central Glass & Ceramic Research Institute, CSIR, Kolkata, India

Abstract

We demonstrate a simple, compact and low cost multi-wavelength and Q-switched fiber lasers based on newly developed octagonal shape double-clad Thulium-Ytterbium co-doped fiber (TYDF). The fiber is fabricated using the modified chemical vapor deposition (MCVD) process in conjunction with the solution doping technique. At 5 m long of TYDF, the laser produces three lines at 1914.5 nm, 1934.7 nm and 1953.6 nm with peak powers of 6.3 dBm, -1.6 dBm and 1.7 dBm, respectively due to the nonlinear polarization rotation effect in the laser ring cavity. The Q-switched TYDF laser operating at 1983.4 nm is also successfully demonstrated by exploiting a multi-walled carbon nanotubes (MWCNTs) polymer composite based saturable absorber. The composite is prepared by mixing the MWCNTs homogeneous solution into a dilute polyvinyl alcohol polymer solution before it is left to dry at room temperature to produce thin film. Then the film is sandwiched between two FC/PC fiber connectors and integrated into the laser cavity for Q-switching pulse generation. By varying the 905 nm multimode pump power from 1570 to 1606 mW, the pulse repetition rate increases from 27.4 to 37.8 kHz and the pulse width fluctuates within 4.9 μs to 3.8 μs. The maximum pulse energy of 10.6 nJ is obatined at pump power of 1570 mW..

Keywords

Thulium Ytterbium Co-doped Fiber, 2 Micron Laser, Q-switching.

Submitted at: May 23, 2014
Accepted at: July 10, 2014

Citation

Z. JUSOH, N. KASIM, Y. MUNAJAT, H. AHMAD, S. W. HARUN, A. HALDER, M. C. PAUL, M.PAL, S. K. BHADRA, New octagonal shape double-clad Thulium-Ytterbium Co-doped fiber for generation of multi-wavelength and Q-switched lasers in 2 micron region, Journal of Optoelectronics and Advanced Materials Vol. 16, Iss. 7-8, pp. 776-781 (2014)