Efficient optical parametric oscillator at 1.6 microm.

Area of Science:

• Laser Physics
• Nonlinear Optics
• Photonics

Background:

• Diode-pumped solid-state lasers are crucial for various applications.
• Operating lasers in the eye-safe wavelength region is important for safety.
• Optical parametric oscillators (OPOs) offer wavelength tunability.

Purpose of the Study:

• To extend the operating regime of diode-pumped Nd:YAG lasers into the eye-safe region.
• To utilize an efficient optical parametric oscillator (OPO) for wavelength conversion.
• To achieve high energy conversion efficiencies at eye-safe wavelengths.

Main Methods:

• Employing a diode-pumped Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) laser as the pump source.
• Utilizing a Potassium Titanyl Phosphate (KTP) based optical parametric oscillator (OPO).
• Characterizing the output energy and conversion efficiency at 1.61 micrometers.

Main Results:

• Achieved operation of Nd:YAG lasers in the eye-safe region (1.61 micrometers).
• Demonstrated total energy conversion efficiencies approaching 40% from 1.06 micrometers to signal (1.61 micrometers) and idler (3.1 micrometers).
• Obtained 25% energy conversion efficiency solely to the 1.61 micrometer signal, with 2.5 mJ output energy and 0.8% wallplug efficiency.

Conclusions:

• The developed OPO system effectively extends Nd:YAG laser operation to eye-safe wavelengths.
• High energy conversion efficiencies and output energies are achievable, demonstrating the system's viability.
• The technology is readily scalable for higher energy applications in the eye-safe spectral region.