Multipass optical parametric amplifier.

Area of Science:

• Optics and Photonics
• Nonlinear Optics
• Laser Technology

Background:

• Nd:YAG lasers are widely used but emit at 1064 nm, which is not eye-safe.
• Laser ranging and radar applications require specific wavelengths, often in the eye-safe spectrum.
• Optical parametric amplifiers (OPAs) can convert laser wavelengths but often require high pump powers.

Purpose of the Study:

• To develop a compact, low-threshold multipass optical parametric amplifier.
• To convert 1064-nm Nd:YAG laser radiation into eye-safe 1572-nm radiation.
• To enable applications in laser ranging and radar.

Main Methods:

• Development of a compact, multipass optical parametric amplifier design.
• Utilizing short-pulse (360-ps) 1064-nm Nd:YAG laser as the pump source.
• Characterization of amplifier threshold pump power and conversion efficiency.

Main Results:

• Achieved a low threshold pump power of 45 microJoule.
• Demonstrated efficient conversion of 1064-nm radiation to 1572-nm radiation.
• At 3-4 times threshold pump power, 30% conversion efficiency was obtained.

Conclusions:

• The developed multipass OPA is effective for generating eye-safe 1572-nm radiation from a 1064-nm Nd:YAG laser.
• The low threshold and high efficiency make this OPA suitable for laser ranging and radar.
• This technology offers a compact and efficient solution for eye-safe laser applications.