Relay telescope for high power laser alignment system
View Patent ↗A laser system includes an optical path having an intracavity relay telescope with a telescope focal point for imaging an output of the gain medium between an image location at or near the gain medium and an image location at or near an output coupler for the laser system. A kinematic mount is provided within a vacuum chamber, and adapted to secure beam baffles near the telescope focal point. An access port on the vacuum chamber is adapted for allowing insertion and removal of the beam baffles. A first baffle formed using an alignment pinhole aperture is used during alignment of the laser system. A second tapered baffle replaces the alignment aperture during operation and acts as a far-field baffle in which off angle beams strike the baffle a grazing angle of incidence, reducing fluence levels at the impact areas.
1. A relay telescope for high-powered laser systems, comprising:
a first relay lens;
a second relay lens;
a vacuum chamber between the first and second relay lenses, the first and second relay lenses focusing beams at a common focal point within the vacuum chamber;
a kinematic mount within the vacuum chamber, adapted to secure beam baffles near the common focal point; and
an access port on the vacuum chamber, adapted for insertion and removal of beam baffles and including
a baffle adapted to be mounted in said kinematic mount, said baffle comprising a solid member having an optically transparent channel, the optically transparent channel having openings on opposite ends of the solid member,and a waist within the solid member near said telescope focal point, said waist being smaller than said openings, and said channel having sides which taper near said waist at a grazing angle in a range of about 1 to 10 degrees.
2. The telescope of claim 1 , wherein said optically transparent channel comprises a hollow in said member.
3. The telescope of claim 1 , including
a far-field alignment baffle adapted to be mounted in said kinematic mount, said alignment baffle comprising a pinhole aperture.
4. The telescope of claim 1 , including a near-field baffle mounted adjacent one of said first and second relay lenses.
5. The telescope of claim 1 , including a first near-field baffle mounted adjacent said first relay lens, and a second near-field baffle mounted adjacent said second relay lens to block stray beams.