Quantum Technology

High-isolation PM isolators & filter-isolator hybrids. Single- and dual-stage PM isolators keep back-reflections out of narrow-linewidth seeds and amplifier chains — fast-axis-blocked, with high isolation and extinction ratio held across temperature. Back-reflection is what turns a quiet seed into a mode-hopping one, so isolation here is the first line of defense for the frequency stability the whole experiment depends on. Our filter-isolator hybrids add a narrowband filter in the same package, stripping ASE and out-of-band light before it can reach the atoms.

Precision tap monitoring. Tap couplers and tap-PD hybrids sample a small, accurately known fraction of the line for closed-loop power stabilization and diagnostics — the ratio set to your power budget, with the coupling accuracy a control loop needs to hold the lock — without disturbing the main path.

Narrowband filtering & pump combining. Custom narrowband filters with sub-nanometer center-wavelength accuracy clean up seed spectra — ASE that survives amplification would otherwise sit on the atomic line and blur the transition — while filter WDMs combine pump and signal bands (976/1020 nm-class pump combining for Yb-doped amplifier stages, for example) on both PM and standard fibers. Hybrid builds fold the isolator in with the WDM, so every saved fusion splice is one less potential back-reflection site.

Any wavelength, built for quantum. We routinely build off the telecom grid: 1560/1590 nm devices for frequency-doubled rubidium chains (780/795 nm cooling and pumping), 1083 nm for metastable helium, and other non-standard bands — on PM, large-mode-area and high-power variants, in the small batches research and pilot systems actually need. Off-grid means each device is engineered from its first design rule for that wavelength, not adapted from a telecom part — fiber type, package and specifications all start from your transition, not from a catalog page.

The whole chain, on your block diagram. Whatever the experiment — 1560 nm seeds doubled to rubidium lines, 1083 nm helium chains, a Yb amplifier breadboard — we deliver the passive section as one integrated, tested set: every isolator, WDM, filter hybrid and tap on your schematic, spliced and qualified together, and documented for the small-batch builds research and pilot systems need.