Laser Crystal
AssigneeAtla Lasers AS
InventorIrina T. SOROKINA
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Abstract
The present disclosure provides a method of optimising an optical system of a mode-locked laser oscillator or a regenerative, multi-pass or single pass amplifier. The method may include the steps of identifying crystallographic axes of an active laser gain medium crystal, cutting the crystal, and orienting the crystal in the optical system in a predetermined orientation relative to a propagation vector of a laser pulse depending on the required output of the optical system.
Claims37
An optical system for a mode-locked laser oscillator or a regenerative, multi-pass or single pass amplifier, the optical system comprising:
- an active laser gain medium having a crystalline structure with second- and third-order optical non-linearity,
- wherein the active laser gain medium is orientated relative to a propagation vector of a laser pulse of laser radiation to control generation of a second harmonic of the laser radiation.
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A method of optimising an optical system of a mode-locked laser oscillator or a regenerative, multi-pass or single pass amplifier comprising:
- identifying crystallographic axes of an active laser gain medium crystal;
- cutting the crystal;
- orienting the crystal in the optical system in a predetermined orientation relative to a propagation vector of a laser pulse depending on the required output of the optical system.
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A laser amplifier, comprising:
- an active laser gain medium having a crystalline structure with second- and third-order optical non-linearity, wherein the active laser gain medium is orientated relative to a propagation vector of a laser pulse of laser radiation to control generation of a second harmonic of the laser radiation,
- the active laser gain medium crystal having refractive index n2, the optical system being configured such that laser pulses are incident on the crystal at a predetermined angle of incidence θi from a medium preceding the crystal having refractive index n1, wherein the crystal has a cut face which is at an angle Φ to a predetermined crystallographic axis of the crystal so that:
- Φ
- =
- 90
- -
- arcsin
-
- (
- n
- 1
-
- n
- 2
-
- sin
-
-
- θ
- i
- )
- whereby, the crystal is configured to minimise generation of the second harmonic, and
- wherein the active laser gain medium has a zinc-blende type crystal structure and the propagation vector of the laser pulse in the laser crystal is parallel to one of the [100], [010], or [001] crystallographic axes to reduce the generation of the second harmonic radiation, or
- wherein the active laser gain medium has a wurtzite type crystal structure and the propagation vector of the laser pulse in the laser crystal is parallel to the [0001] crystallographic axis to reduce the generation of the second harmonic radiation.
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Dependencies are inferred from the claim text.