AbsoluteLambda

Wavelength meters and software

To meet highest demands, our C-WAVE tunable lasers can be operated in closed-loop mode with the optional AbsoluteLambda extension. It comprises an external wavelength meter and a software package to provide enhanced absolute wavelength accuracy and enhanced long term frequency stability.

• Absolute wavelength accuracy up to 10 MHz
• Long term frequency stability up to +/- 2 MHz over hours

Absolute lambda

Model overview
Choose between six wavelength meter models to meet application specific requirements. In closed-loop operation with the AbsoluteLambda extension, the absolute wavelength accuracy of a C-WAVE tunable laser will equal the absolute wavelength accuracy of the wavelength meter selected…

abs. accuracy (C-WAVE, closed-loop) = abs. accuracy (wavelength meter)

… and the long term frequency stability of a C-WAVE tunable laser will be determined by the frequency resolution of the wavelength meter selected:

freq. stability (C-WAVE, closed-loop) = +/- freq. resolution (wavelength meter)

For operation with third-party wavelength meters, the AbsoluteLambda software package is also available separately.

Applications
The AbsoluteLambda closed-loop extension is field proven in applications such as color center research and other quantum technologies, nanophotonics, and high resolution spectroscopy.

Category: Options & Accessories

Specifications

Model	Absolute accuracy	Resolution
AbsoluteLambda A3000	3000 MHz	1000 MHz
AbsoluteLambda A600	600 MHz	100 MHz
AbsoluteLambda A200	200 MHz	50 MHz
AbsoluteLambda X60	60 MHz	10 MHz
AbsoluteLambda X30	30 MHz	5 MHz
AbsoluteLambda X10	10 MHz	2 MHz

Data sheets

AbsoluteLambda wavelength meters and software

Literature

Publication	Application	Reference
Giant Rydberg excitons in Cu2O probed by photoluminescence excitation spectroscopy M. A. M. Versteegh et. al.	Rydberg Excitons	arXiv 2021
Coherence imaging spectroscopy at Wendelstein 7-X for impurity flow measurements V. Perseo et. al.	High Resolution Spectroscopy	Rev. Sci. Inst. 2020
Photoelectrical imaging and coherent spin-state readout of single nitrogen-vacancy centers in diamond F. Jelezko and co-workers	Color Centers	Science 2019
Optical Gating of Resonance Fluorescence from a Single Germanium Vacancy Color Center in Diamond W. Gao and co-workers	Color Centers	Phys. Rev. Lett. 2019
A new calibration implementation for Doppler Coherence Imaging Spectroscopy D. Gradic et. al.	High Resolution Spectroscopy	Fusion Eng. and Design 2019
Made Easy: CW Laser Light Widely Tunable Across the Visible J. Sperling and K. Hens	OPO Technology	Optik & Photonik 2018

Will I require the AbsoluteLambda option for closed-loop operation of a C-WAVE tunable laser?

In essence, closed-loop operation will be required in following cases:

1. If an absolute accuracy of the output wavelength of better than +/- 1 nm (visible range) respectively +/- 2 nm (infrared range) is required.

2. If a long term frequency stability over hours of better than < 150 MHz (approximately < 0.15 picometers in the visible range) is required.

Please contact us to discuss your experimental requirements in more detail!

How to select a wavelength meter for closed-loop operation of a C-WAVE tunable laser?

There are a few things that need to be considered when choosing a wavelength meter for closed-loop operation of a C-WAVE tunable laser.

1. Wavelength coverage
The wavelength meter will need to spectrally cover the infrared part of the wavelength tuning range. In other words, the wavelength meter will need to cover the 900-1300 nm output of C-WAVE VIS/IR respectively the 1000-1500 nm output of C-WAVE GTR/NIR. Note that there is no need to have the wavelength meter covering the visible spectral range.

2. Absolute accuracy
In closed-loop operation, the absolute wavelength accuracy of a C-WAVE tunable laser will be determined by the absolute wavelength accuracy of the wavelength meter: