Saturable absorber mirror
AssigneeTOPTICA Photonics AG
InventorReto Haring
Life of this patent
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Abstract
The invention relates to a saturable absorber mirror comprised of a) a rear-side reflector layer (2), b) an intermediate layer (6), the boundary areas of which form an interference filter, c) at least one absorber layer arranged within the interference filter and comprised of a material absorbing a light at operating wavelength of the saturable absorber mirror depending on intensity, and d) a front-side cover layer, it is the object of the invention to provide a saturable absorber mirror having improved properties. To this effect the invention proposes that the interference filter is neither resonant nor anti-resonant at operating wavelength, with the intensity (I) of the electromagnetic stationary wave field of the light in the interior of the cover layer (5) having a local extremum (8).
Claims17
Saturable absorber mirror comprised of
- a) a rear-side reflector layer (2),
- b) an intermediate layer (6), the boundary areas of which form an interference filter,
- c) at least one absorber layer (7) arranged within the interference filter and made of a material absorbing light at operating wavelength of the saturable absorber mirror depending on intensity, and
- e) a front-side cover layer (5),
- characterized in that
- the interference filter is neither resonant nor anti-resonant at the operating wavelength, with the intensity (I) of the electromagnetic stationary wave field of the light (1) in the interior of the cover layer (5) having a local extremum (8).
Method for adapting a saturable absorber mirror to a pre-defined operating wavelength,
- characterized in that
- the saturable absorber mirror comprised of
- a) a rear-side reflector layer (2),
- b) an intermediate layer (6), the boundary areas of which neither form a resonant nor an anti-resonant interference filter at operating wavelength, and
- c) at least one absorber layer (7) arranged within the interference filter and made of a material absorbing light at operating wavelength of the saturable absorber mirror depending on intensity is coated at its front side with a cover layer (5) being transparent at operating wavelength and the thickness of to which is so determined that the course of the reflectivity (R) depending on the light wavelength (λ) is mainly symmetrically to the operating wavelength.
Dependencies are inferred from the claim text.