Abstract
The self-phase locking of a stimulated Brillouin scattering-phase conjugate mirror (SBS-PCM) allows a simple and scalable coherent beam combination of existing lasers. We propose a simple optical system composed of a rotating wedge and a concave mirror to overcome the power limit of the SBS-PCM. Its phase locking ability and the usefulness on the beam-combination laser are demonstrated experimentally. A four-beam combination is demonstrated using this SBS-PCM scheme. The relative phases between the beams were measured to be less than λ/24.7.
Highlights
A high-power laser with a pulse width of several ns, a repetition rate exceeding 10 Hz, and a power level of more than 1 kW has many applications in both scientific and industrial fields [1]
The self-phase locking of a stimulated Brillouin scattering-phase conjugate mirror (SBS-PCM) allows a simple and scalable coherent beam combination of existing lasers
We propose a simple optical system composed of a rotating wedge and a concave mirror to overcome the power limit of the SBS-PCM
Summary
A high-power laser with a pulse width of several ns, a repetition rate exceeding 10 Hz, and a power level of more than 1 kW has many applications in both scientific and industrial fields [1]. In 2001, Yoshida et al showed that the input power limit of the SBS-PCM can be increased by continuously moving a focal spot inside the medium using a rotating wedge [16] In this way, the heat load is distributed to a large volume and the reflectivity and fidelity can be improved significantly. The SBS-PCM with the rotating wedge in Yoshida’s scheme is not self-phase-locking and cannot be utilized in a coherent beam-combination laser. There was remaining path length fluctuation of 1 to 3 λ after the alignment depending on the rotating-wedge/SBS-cell combination. We surmised that this was due to the surface irregularity of the optics and the gap in the ball bearing of the rotating wedge mount
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