Potassium, Sodium & Lithium Lasers

INTERNAL DRAFT — not for release. Remove this banner and settle the sodium question before this page goes public.

Potassium, sodium and lithium share a page because each needs only one or two wavelengths — and because the three of them together map the edges of what our conversion platform reaches. Potassium sits comfortably inside the SHG band, lithium inside the SFG band, and sodium in the gap between them.

Overview Rubidium Cesium Ytterbium Strontium Potassium, Sodium & Lithium

5Wavelengths across 3 species

1From the standard catalogue

2Configurable within a band

<20 kHzLinewidth, single-frequency

Coverage across the three species

Markers show the wavelengths these experiments call for. Bands beneath the axis show where QTekLaser™ generates light — by second-harmonic generation, sum-frequency generation, or directly from a single-frequency amplifier.

Available nowConfigurable within a bandCustom — enquire

Potassium

Both potassium D lines sit within a few nanometres of each other at the top of our SHG band. The 770 nm system is a stock product; 767 nm is the same platform retuned.

Wavelength	Role in a K experiment	Output power	Source	Availability
767 nm	D2 cooling	2 W	SHG fiber laser, 765–805 nm	Configurable
770 nm	D1 cooling, gray molasses, repumping & atomic absorption	2 W	770 nm Fiber Laser	Catalogue

Lithium

Lithium’s D1 and D2 lines sit only 0.02 nm apart at 671 nm — a near-degenerate fine structure that makes sub-Doppler cooling difficult and puts a premium on a narrow, quiet source. 671 nm falls inside our sum-frequency generation band.

Wavelength	Role in a Li experiment	Output power	Source	Availability
671 nm	D1 and D2 cooling across the near-degenerate fine structure	up to 20 W	SFG fiber laser, 609–706 nm	Configurable

Sodium

The sodium D lines at 589 nm and 590 nm are among the hardest wavelengths in cold-atom physics to generate with a narrow linewidth and useful power. They fall between our SHG band, which ends at 540 nm, and our SFG band, which begins at 609 nm.

Wavelength	Role in an Na experiment	Output power	Source	Availability
589 nm	D2 cooling	—	Between the 506–540 nm SHG and 609–706 nm SFG bands	Enquire
590 nm	D1 cooling	—	Between the 506–540 nm SHG and 609–706 nm SFG bands	Enquire

Review notes

Sodium is the open question. As written, both Na rows promise nothing — no product, no power. 589 nm is classically made by sum-frequency generation of 1064 nm and 1319 nm, and both of those sit inside amplifier bands you already have. Either build it and turn this section into a capability, frame it explicitly as custom development, or drop sodium from the page and from the Applications dataset.
767 nm appears in the Product Selection Guide as QT-LASR-SHG-767-2-A/W-2-2.0-0 but has no product page — part of the Selection Guide / lineup mismatch already flagged.
Confirm the 767 nm and 671 nm powers. 2 W comes from the Selection Guide entry; 20 W is the SFG family maximum, not a measured figure at 671 nm.
These three species are tagged in the Applications dataset for cooling only. If K, Na or Li customers also buy 1064 nm dipole traps or 532 nm tweezers — both stock products — those rows should be added here and to the dataset.