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US 12,368,275 B2Granted
Pulse shaping device and pulse shaping method
AssigneeNational Institutes for Quantum Science and Technology
InventorsMasaharu Nishikino, Michiaki Mori, Thanhhung Dinh, Sadaoki Kojima, Toshiyuki Kitamura, Noboru Hasegawa, Kiminori Kondo
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Abstract
This invention provides a pulse shaping technique that can yield a pulsed laser having a smaller energy fluctuation than that of a conventional pulse shaping technique using one or two non-linear optical crystals. A pulse shaping device includes: a non-linear optical crystal group including at least three non-linear optical crystals arranged side by side on an optical path of an input pulsed laser.
Claims10
A pulse shaping device comprising:
- a non-linear optical crystal group including at least three non-linear optical crystals arranged side by side on an optical path of an input pulsed laser, wherein
- among said at least three non-linear optical crystals, an i-th one from an upstream side of the input pulsed laser is an i-th non-linear optical crystal,
- no polarizer is provided between a second non-linear optical crystal and a third non-linear optical crystal, and
- an angle a3 made by a crystallographic axis of the third non-linear optical crystal and a polarization direction of the input pulsed laser is set so that a relative energy fluctuation in a pulsed laser being output from the third non-linear optical crystal and having a polarization direction orthogonal to the polarization direction of the input pulsed laser is smaller than a relative energy fluctuation in a pulsed laser being output from the second non-linear optical crystal and having a polarization direction orthogonal to the polarization direction of the input pulsed laser.
1 more element
A pulse shaping method comprising:
- using a non-linear optical crystal group to improve a contrast ratio of an input pulsed laser, the non-linear optical crystal group including at least three non-linear optical crystals arranged side by side on an optical path of the input pulsed laser, wherein
- among said at least three non-linear optical crystals, an i-th one from an upstream side of the input pulsed laser is an i-th non-linear optical crystal,
- no polarizer is provided between a second non-linear optical crystal and a third non-linear optical crystal, and
- an angle a3 made by a crystallographic axis of the third non-linear optical crystal and a polarization direction of the input pulsed laser is set so that a relative energy fluctuation in a pulsed laser being output from the third non-linear optical crystal and having a polarization direction orthogonal to the polarization direction of the input pulsed laser is smaller than a relative energy fluctuation in a pulsed laser being output from the second non-linear optical crystal and having a polarization direction orthogonal to the polarization direction of the input pulsed laser.
1 more element
Dependencies are inferred from the claim text.