Upconversion laser produces 0.47 W of green light

March 1, 2006
Based on photon avalanching and other processes, frequency upconversion is a method for creating short-wavelength lasers that does not involve nonlinear frequency conversion and its associated intensity-fluctuation problems.

Based on photon avalanching and other processes, frequency upconversion is a method for creating short-wavelength lasers that does not involve nonlinear frequency conversion and its associated intensity-fluctuation problems. Aiming for high-power upconversion at visible wavelengths, scientists at the Universität Hamburg (Hamburg, Germany) and Coherent Lambda Physic (Lübeck, Germany) have developed an upconversion laser based on erbium-doped lithium lutetium tetrafluoride (LiLuF4) that emits 0.47 W of continuous-wave power at a 552-nm wavelength, or a 0.76-W peak power at a 50% duty cycle. The room-temperature laser is pumped with 970-nm light from an optically pumped semiconductor (OPS) laser.

The 1.6-mm LiLuF4 crystal is coated on one side to reflect highly at the pump wavelength and on the other to reflect highly at the upconversion wavelength; curved mirrors external to the crystal and a small angular offset of the pump beam result in a multipass pumping scheme. (The OPS pump laser emits up to 9 W with a beam parameter M2 between 2 and 2.5.) The upconversion laser has a threshold of 70 mW of absorbed pump power and a slope efficiency of 32%. Contact Ernst Heumann at [email protected].

Sponsored Recommendations

Achromatic Lenses: High-Quality Custom Optics

March 13, 2025
Ensure clarity and accuracy in your optics systems with Lacroix’s achromatic lenses. Explore how our custom solutions minimize chromatic aberration for perfect results.

Manufacturing Considerations for Tolerancing Aspheres

March 13, 2025
Understand the critical factors in manufacturing aspheres and how Lacroix Optics ensures precise tolerancing in every optical component.

Explore Our Videos: Insights into Precision Optics

March 13, 2025
Get an inside look at Lacroix Optics with our collection of informative videos showcasing our capabilities, innovations, and processes.

Optical Assemblies: Reliable and Precise Solutions

March 13, 2025
Ensure your optical system works seamlessly with Lacroix Optics' custom optical assemblies. Discover the precision and reliability we bring to every project.

Voice your opinion!

To join the conversation, and become an exclusive member of Laser Focus World, create an account today!