Coherent light generators – Particular beam control device – Optical output stabilization
Reexamination Certificate
2007-01-09
2007-01-09
Harvey, Minsun Oh (Department: 2828)
Coherent light generators
Particular beam control device
Optical output stabilization
Reexamination Certificate
active
10470894
ABSTRACT:
The invention relates to a method for checking the regulation state of a frequency-stabilised laser system comprising a laser (2). At least one first sidebrand frequency VHF is modulated to the laser beam (1) of said laser, the laser beam being guided through an absorption material (13) comprising a plurality of absorption lines in a detuning region of the laser (2), said absorption lines being arranged at different distances from each other. The laser frequency VLis detuned and, as a regulation signal for the laser frequency VL, it is determined whether there has been an absorption in the absorption material. The inventive method is characterised in that a second sidebrand frequency VFGis modulated to the laser beam (1), said frequency being at a known distance defined by a frequency generator (29) in relation to the laser frequency VO; in that the absorption of the second sidebrand frequency VO+VFGin the absorption material is checked at least from time to time; and in that when no absorption is observed for the second sidebrand frequency, the laser frequency VLis detuned until an absorption of both the laser frequency VO and the second sidebrand frequency VO+VFGis observed.
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Bundesrepublik Deutschland, Vertreten Durch das Bundesminsterium
Finneren Rory
Harvey Minsun Oh
Whitham Curtis Christofferson & Cook PC
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