D2-210 Saturated Absorption Spectroscopy Module

In stock
As low as $5,224.00

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


  • 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.

View a typical configuration of a D2-125 servoing a D2-100-DBR laser.

Fill Choices K, Rb, Cs
Coupling Configuration Terminal or pass-through
Input power range1 2-1,000 mW
Input type Free-space or Fiber-coupled2
Supported locks Side-of-transition, peak
Gas Cell Temperature ~35°C
Temperature Stability ~0.01°C
Beam Height 0.95"
Package Dimensions 3.62" × 4.98" × 1.7"
Photodiode Amplifier
Transimpedance (signal) 20 kΩ
Bandwidth (signal) 5 MHz
Noise @ 4 MHz (shot level) 80 nV/√Hz
Power Cable Order VPN00410 Hirose-to-D Sub 9-pin when powered by D2-005
Order VPN00475 Hirose-to-Hirose when powered by ICE-Box

All specification subject to change without notice.
1For best results.  As little as 500 µW will produce usable signals.

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