Gain dynamics in Er(3+):Yb(+) co-doped fiber amplifiers.

Area of Science:

• Photonics and Optical Engineering
• Laser Physics
• Materials Science

Background:

• Gain dynamics of Erbium (Er3+) or Ytterbium (Yb3+) doped fiber amplifiers are well-understood.
• No prior analysis exists for Er3+:Yb3+ co-doped fiber amplifier gain dynamics.
• Understanding gain dynamics is vital for low-noise amplifiers and coherent beam combining.

Purpose of the Study:

• To theoretically and experimentally analyze the gain dynamics of Er3+:Yb3+ co-doped fiber amplifiers.
• To investigate the impact of energy transfer between Yb3+ and Er3+ ions.
• To determine the Yb3+-Er3+ energy transfer function.

Main Methods:

• Theoretical analysis using numerical simulations.
• Experimental investigation of gain dynamics.
• Determination of the Yb3+-Er3+ transfer function.

Main Results:

• A full analytical solution for gain dynamics is not possible due to Yb3+-Er3+ energy transfer.
• Numerical simulations provide valuable insights into the gain dynamics.
• Experimental and numerical results show good qualitative agreement.
• The Yb3+-Er3+ transfer function was experimentally determined.

Conclusions:

• The study provides the first comprehensive analysis of Er3+:Yb3+ co-doped fiber amplifier gain dynamics.
• Numerical simulations are essential for understanding these complex dynamics.
• The experimentally determined transfer function aids in the design of advanced fiber amplifiers.