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Optics Letters

High-power, 420-nm, low-intensity-noise laser source for quantum computing applications

Thomas Dubé, Coline Lavit, Dia Darwich, Siddharatha Thakur, Kentin Poncelet, Mathieu Goeppner, Thomas Hilaire, Germain Guiraud, Nicholas Traynor, Adèle Hilico, Giorgio Santarelli

Published Apr 17, 2026• 0 citations
Publisher

Abstract

We demonstrate the generation of 20.2 W of continuous-wave, low-intensity noise, single-frequency light at 840 nm, obtained via sum-frequency mixing of two high-power infrared fiber laser systems in an MgO-doped periodically poled lithium niobate (ppLN) crystal. Subsequent cavity-enhanced frequency doubling to 420 nm yields an output power of 15.2 W. Respective conversion efficiencies of 48% and 79% are achieved for the sum-frequency and second-harmonic stages, with good beam quality (M 2 < 1.3), low intensity noise (<0.05% RMS [1 kHz–10 MHz]), and long-term continuous operation. Relative intensity noise and frequency noise of the generated signals are experimentally characterized.

DOI
10.1364/ol.596001

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Single-photon signals at 1.56 ¿m were converted into the visible region by sum-frequency generation, with synchronous pump pulses at 1.03 ¿m in a periodically poled lithium niobate crystal. The signal and pump sources were provided by two synchronized mode-locked fiber lasers at the operation rate of 7.88 MHz. Such a high-speed single-photon upconversion system has shown an overall detection efficiency of 10.4%. The corresponding background noise was measured to be 3.3 × 103s-1. The noise-equivalent power in this scheme was 9.93 × 10-17W/Hz1/2, which was the lowest compared to the other upconversion systems with similar pump and signal wavelengths.
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