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Published on: November 22, 2019
High power coherent beam combination from two fiber lasers
Optics Express
|June 12, 2009
Summary
Two fiber lasers were phase-locked using a self-imaging resonator and spatial filter. This method achieved over 12W of coherent output power with high efficiency and stability.
Area of Science:
- Photonics
- Laser Physics
- Optical Engineering
Background:
- Fiber lasers offer high power and beam quality.
- Coherent combination of multiple fiber lasers is crucial for achieving ultra-high power outputs.
- Existing methods for phase locking can be complex and prone to instability.
Purpose of the Study:
- To demonstrate stable phase locking of two fiber lasers.
- To achieve high-efficiency coherent power combination.
- To investigate a novel self-imaging resonator with a spatial filter for laser phase locking.
Main Methods:
- Experimental demonstration of phase locking using a self-imaging resonator.
- Incorporation of a spatial filter within the resonator.
- Measurement of coherent output power and combination efficiency.
Main Results:
- High-contrast interference fringes indicating successful phase locking were observed.
- Coherent output power exceeding 12W was achieved.
- An efficient coherent power combination of 88% was obtained with 60W pump power.
Conclusions:
- The self-imaging resonator with a spatial filter is an effective method for phase locking fiber lasers.
- The system demonstrated stable operation without thermal effects on the spatial filter.
- This technique offers potential for further scaling of coherent output power.
