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US 6,185,235 B2Granted
Lasers with low doped gain medium
AssigneeSpectra-Physics Lasers, Inc.
InventorsEmily Cheng, Dave R. Dudley, William L. Nighan, Jr., James D. Kafka, David E. Spence, David S. Bell
Life of this patent
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Abstract
A high power, diode pumped laser has a Nd:YVO4 gain media. Scaling to higher powers is achieved with the use of a low doped gain media, increasing the length of the gain media as well as increasing the pump volume. Passive cooling is extended to output powers of 10 W or greater .
Claims37
A diode pumped laser, comprising:
- a first high reflector mirror and an output coupler defining a resonator cavity;
- a first Nd:YVO4 gain medium positioned in the resonator cavity, the gain medium having a uniform doping level of less than 0.5% to reduce thermal lensing and a length of at least 4 mm to absorb a substantial portion of a pump bean;
- and
- a first diode pump source supplying a first pump beam that is incident on a first pump face of the first Nd:YVO4 gain medium.
1 more element
A diode pumped laser, comprising:
- a first high reflector mirror and an output coupler defining a resonator cavity;
- a first Nd:YVO4 gain medium positioned in the resonator cavity with uniform doping of 0.5% or less and a pump volume of at least 8 mm3 to reduce thermal lensing;
- and
- a first diode pump source supplying a first pump beam that end pumps a first pump face of the first Nd:YVO4 gain medium.
1 more element
A diode pumped laser, comprising:
- a first high reflector mirror and an output coupler defining a resonator cavity;
- a first Nd:YVO4 gain medium positioned in the resonator cavity and having a uniform doping level of less than 0.5% to reduce thermal lensing and a length greater than 8 mm to absorb a substantial portion of a pump beam;
- and
- a first diode pump source supplying a first pump beam that is incident on a first pump face of the first Nd:YVO4 gain medium.
1 more element
Dependencies are inferred from the claim text.