The optical amplifier further comprises a second gain medium operatively coupled to the first gain medium and a second pump that supplies optical energy into the second gain medium.

Each SOA stage (110) includes a semiconductor gain medium (120) and a laser cavity (140) including the semiconductor gain medium (120).

The optical amplifier further comprises a second gain medium (10b) operatively coupled to the first gain medium (10a) and a second pump (20b) that supplies optical energy into the second gain medium.

The first gain medium is an optical fiber of a predetermined length, such that inversion of this first gain medium is not saturated.

The invention relates to an amplifying medium for solid-state dye lasers and a solid-state dye laser provided with said amplifying medium.

The amplifying medium, the birefringent non-linear medium are mutually integral so as to constitute a monolithic resonant cavity.

A gain medium for use in optical amplifiers or laser oscillators is disclosed.

This is achieved by use of an adaptive optical element, for reducing the diameter of the energy beam impinging on the gain medium, thereby increasing the overlap between the energy beam and the gain medium.

The gain medium may be a disc having a thickness substantially smaller than its lateral dimensions.

The active laser medium is located between two mirrors, the "resonator".

The active laser medium is positioned between two mirrors, the “resonator”.

The active laser medium is located between two mirrors, the "resonator.

Furthermore, an optical amplifier implemented using a gain medium for the LMLS has no cross-coupling and can obtain a gain within a wide band.

The transverse emission in turn optically pumps a second volume of the gain medium about the first volume.

The transmitter contains an amplifying laser medium, and this together with a retroreflector in the receiver, forms a laser resonator.