Abstract: A system is provided for generating a laser beam via non-linear effects, including: a monofrequency continuous-wave laser source; and an external resonant cavity referred to as a microchip cavity. The microchip cavity is composite insofar as it is a unitary assembly of a plurality of materials g: at least one nonlinear crystal; an entrance mirror; a concave mirror deposited on a material fixed to the nonlinear crystal—the material on which the concave mirror is deposited is different from the constituent material of the nonlinear crystal; a first thermoelectric module for controlling the temperature of the nonlinear crystal; and at least one second thermoelectric module for controlling at least the temperature of the material on which the concave mirror is deposited.

Abstract: A system is provided for generating a laser beam via non-linear effects, including: a monofrequency continuous-wave laser source; and an external resonant cavity referred to as a microchip cavity. The microchip cavity is composite insofar as it is a unitary assembly of a plurality of materials g: at least one nonlinear crystal; an entrance mirror; a concave mirror deposited on a material fixed to the nonlinear crystal—the material on which the concave mirror is deposited is different from the constituent material of the nonlinear crystal; a first thermoelectric module for controlling the temperature of the nonlinear crystal; and at least one second thermoelectric module for controlling at least the temperature of the material on which the concave mirror is deposited.

Abstract: A Raman laser device includes: an amplifying medium (2) absorbent at a pump wavelength ?P and emitting at an excitation wavelength ?S, a Raman medium (3) exhibiting at least one Stokes shift ??R, such as to convert the emission at the excitation wavelength ?S into a continuous emission at a Raman wavelength ?R. The amplifying medium and the Raman medium belong to a Raman cavity resonant at the excitation wavelength ?S and at the Raman wavelength ?R. The length of the Raman medium is less than 9 mm and the sum of the gaps between each of the elements of the Raman cavity is less than 2 mm. A system including such a Raman laser device, and a method of adjusting the Raman laser device are described.

Abstract: Geometrical design of laser microchips is disclosed that allows variation of the optical path length in the different media by simple displacement of the microchip, the movement having a non-zero projection orthogonal to the pump beam. The concept can be implemented to vary optical loss in the lasing cavity, the absorbed pump power, or the optical length of the cavity. Passively Q-switched microchip laser output performance can thus be controlled by simple transverse displacement of the microchip relative to the pump beam. The above microlaser can be combined with voltage-controlled variable-focus output optics in order to control the peak power density of the laser pulses.

Abstract: Application of a modular coaxial package design, compatible with telecommunication passive component packaging, to microchip lasers, in particular to passively Q-switched microlasers, pumped with a fiber-coupled diode, is disclosed. The number of parts is thereby reduced while providing the adequate degrees of freedom for the active or passive alignment of the optical elements within the package.

Abstract: Application of a modular coaxial package design, compatible with telecommunication passive component packaging, to microchip lasers, in particular to passively Q-switched microlasers, pumped with a fiber-coupled diode, is disclosed. The number of parts is thereby reduced while providing the adequate degrees of freedom for the active or passive alignment of the optical elements within the package.

Abstract: Geometrical design of laser microchips is disclosed that allows variation of the optical path length in the different media by simple displacement of the microchip, the movement having a non-zero projection orthogonal to the pump beam. The concept can be implemented to vary optical loss in the lasing cavity, the absorbed pump power, or the optical length of the cavity. Passively Q-switched microchip laser output performance can thus be controlled by simple transverse displacement of the microchip relative to the pump beam. The above microlaser can be combined with voltage-controlled variable-focus output optics in order to control the peak power density of the laser pulses.