28 January 2025

Innolume Demonstrates 1W 1.06µm DFB Laser with Record Efficiency at SPIE Photonics West 2025

On January 27 at SPIE Photonics West 2025, Alexey Kovsh delivered a talk on cutting-edge advancements in high-power GaAs-based DFB lasers. The primary focus was on demonstrating an InGaAs quantum well-based 1.06 µm DFB laser, delivering up to 1 W of optical power with a power conversion efficiency (PCE) of 45% in continuous-wave (CW) mode for seed applications. This achievement represents a significant advancement in developing high-power and highly efficient lasers for applications such as amplifiers, holography, frequency doubling, and material processing.

Key Points from the Presentation

Single Epitaxial Growth Fabrication Process: The laser structure is MBE-grown without overgrowth steps, with a corrugated grating placed near the waveguide core.
High Power and Efficiency: The 4 mm-long DFB laser achieves up to 1 W ex-facet CW power with a PCE as high as 46%. Based on our knowledge these values are world record results for GaAs based DFB lasers.
Beam Quality and High coupling efficiency into single-mode fiber: A stable far-field profile with a Gaussian shape and divergence of 4x27 degrees FWHM ensures more than 70% efficient coupling into single-mode fibers across a wide range of operating conditions. This results in 300 mW CW optical power from fiber with a PCE of 35% from 3 mm-long lasers.
Narrow Linewidth: The measured optical linewidth remains below 300 kHz FWHM in wide range of output power, making these lasers ideal for applications requiring high coherence.

Quantum Dot DFB Lasers for O-Band

In addition to QW-based advancements, Innolume presented its latest progress in quantum dot-based DFB lasers for the O-Band. These QD lasers deliver more than 150 mW output power across a wide temperature range from 25°C to 85°C and are designed to operate in transceivers without optical isolators. With a built-in in-situ window structure, these lasers exhibit superior reliability by preventing catastrophic optical mirror damage (COMD).

Event Details:

Dates: January 28–30, 2025
Location: The Moscone Center, 747 Howard St, San Francisco, CA, USA
Our Booth: #4324

We invite you to visit our booth to learn more about our cutting-edge advancements in high-power DFB laser technology.

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