Variable coherence length high brightness laser architecture

Details Variable coherence length high brightness laser architecture Variable coherence length high brightness laser architecture

1995-08-28

1998-10-20

Jr., Leon Scott

Coherent light generators

Particular beam control device

Modulation

372 12, 372 82, 372 92, 372 98, 372 27, 372 28, H01S 310

Patent

active

058257918

ABSTRACT:
A high power laser source having a preselected broad bandwidth, including a master oscillator providing a single-mode laser beam, a resonant electro-optical modulator and a source of radio-frequency (rf) modulation voltage, to produce a modulator output beam having sidebands spaced on each side of the nominal frequency of the single-mode laser beam. The bandwidth and the number of modes may be varied by controlling the voltage applied to the modulator. At least one additional modulator in series with the first provides for the addition of other sidebands overlaying those generated with just one modulator. In another embodiment of the invention, the modulator is installed in a PC MOPA (phase conjugated master oscillator power amplifier) configuration to provide modulation only on the return path of the beam from a phase conjugation device having a stimulated Brillouin scattering (SBS) medium. Because the electro-optical modulator is sensitive to polarization direction, it can be oriented to be effective only for the return beam, which has a different direction of polarization from that of the single-mode laser beam, thus optimizing the performance of the SBS medium.

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