D2-210 Saturated Absorption Spectroscopy Module

D2-210 saturated absorption spectroscopy module provides primary frequency standard based on alkali metal hyperfine spectra

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  • Configurable for Potassium, Rubidium, or Cesium
  • Side or Peak Locking
  • Temperature stabilized
  • Intensity normalized
  • Magnetic shielding
  • Terminal or pass-through configuration
  • Improved mechanics
  • Optional Doppler subtraction and fiber coupling
  • 5 MHz loop bandwidth

The D2-210 Saturated Absorption Spectroscopy Module is an integral piece of our complete line of photonics tools supporting the AMO Community.

Saturated Absorption High-Precision Frequency Reference

Vescent Photonics’ D2-210 second-generation Spectroscopy Module makes locking to atomic transitions easier and more powerful than ever before. Completely redesigned to maximize performance in a number of laser-locking environments, the D2-210 makes atomic absorption-referenced frequency locks simple. Designed to work as a general-purpose frequency discriminator, it is compatible with our D2-125 Reconfigurable Servo as well as other feedback loop filters.The D2-210 can be charged with either Potassium, Rubidium, or Cesium. It is magnetically shielded to reduce perturbations due to magnetic fields, and accommodates free-space or, optionally, a fiber-coupled input. The D2-210 allows flexible operation, accepting laser powers from microwatts to over a hundred milliwatts, and it also offers improved, easier-to-align optomechanics and a beam path that effectively eliminates back reflections to the laser. The D2-210 provides a signal to lock to either the side of an absorption or the peak and can optionally support Doppler-broadened background subtraction.



Input Power 2 < P < 1,000 mW

Photodiode Amplifier

Transimpedance 40,000 Ω
Bandwidth 5 MHz
Noise at 5 MHz <80 nV/√Hz

Temperature Control

Set Point Temperature Range 25-65°C
Temperature Stability <0.1°C


Beam Height 0.96"
Dimensions 3.6 x 5 x 1.7"

D2-210 drawing (66.74 kB)