Single Beam vs Traditional Interferometer: Which Fits Your Lab?
By Zygo | Published: 2026-10-29
Category: Comparisons
Compare single beam interferometers with traditional designs to decide which fits your lab's measurement needs and vacuum compatibility requirements.
Quick Answer
For labs using a retroreflector target on apex, a single beam interferometer like Zygo's offers a compact, alignment-tolerant solution; traditional interferometers may be better for other target geometries or when vacuum compatibility isn't a concern.
Why target geometry matters
The main difference between single beam and traditional interferometers lies in how they handle the measurement beam. A single beam interferometer is designed specifically for use with a retroreflector target on apex, which simplifies alignment and reduces sensitivity to tilt. Traditional interferometers often use flat mirrors or other targets, which can be more forgiving in some setups but require more precise alignment.
If your lab already uses retroreflector targets, a single beam design can save time and reduce errors. If you work with a variety of target types, a traditional interferometer might offer more flexibility.
Vacuum compatibility: a key decision point
Zygo's Single Beam Interferometer is offered in two vacuum compatibility options: one that is not compatible and one that is. This choice is critical if your measurements take place in a vacuum chamber, as standard optics may outgas or misalign under vacuum. Selecting the right version up front avoids costly retrofits later.
If you never operate under vacuum, the non-compatible version is simpler and likely more cost-effective. If there's any chance of future vacuum use, choose the compatible version to future-proof your setup.
Trade-Offs at a Glance
- Single beam with retroreflector: Simplifies alignment and reduces tilt sensitivity, but requires a retroreflector target on apex; not ideal for flat mirror setups. Confirm your target type before choosing.
- Vacuum-compatible version: Enables use in vacuum environments but may cost more and have different handling requirements. Assess current and future vacuum needs.
- Traditional interferometer: Offers flexibility with various targets but may require more careful alignment and could be less compact. Consider if you need multi-target support.
Product Facts
- Single Beam Interferometer: The Single Beam Interferometer from ZYGO is designed for use with a retroreflector target on apex. This ensures you get the right beam geometry for retroreflector-based measurements, reducing alignment time and potential errors.
Single Beam Interferometer - Single Beam Interferometer: It is offered in two vacuum compatibility options: not compatible (SKU 6191-0624-01) or compatible. Choose the vacuum-compatible version if your measurements occur in a vacuum chamber; otherwise, the standard version is sufficient and may be more economical.
Which Should You Choose?
Best for
- Labs using retroreflector targets on apex and seeking alignment simplicity
- Setups that require vacuum compatibility and need a dedicated single beam solution
Not for
- Labs using flat mirrors or other target geometries that need a traditional interferometer
- Applications where vacuum compatibility is not required and budget is a primary concern
