Precision Photoelastic Modulators for Polarization
Featured Product from CASTECH, Inc.

Photoelastic Modulators (PEMs) are dynamic optical waveguides that can control the polarization state of light by inducing a dynamic phase retardation. Made from isotropic materials, these modulators vibrate at their resonant frequency, causing periodic changes in the refractive index of the optical material. This change modulates the phase of the transmitted light, enabling precise control of polarization.
CASTECH’s PEMs offer several unique features:
- Large Acceptance Angle: Allows efficient operation with various light sources.
- Wide Wavelength Range: Suitable for ultraviolet, visible, and infrared light.
- High Modulation Frequency: Provides fast, accurate control of polarization.
- High Precision: Ensures reliable and precise modulation for sensitive applications.
CASTECH PEMs are available in two models:
- One-Dimensional PEMs: With a single vibration axis, these are designed for UV, visible, and near-infrared applications.
- Two-Dimensional PEMs: These have two vibration axes for a wider range of phase modulation, typically used in visible and infrared applications.
Applications:
- Polarization Measurement: Essential for analyzing light properties in various optical experiments.
- Quantum Sensing: Critical for applications requiring precise control of light polarization.
- Spectroscopy: Ideal for use in spectrometers, enhancing resolution and accuracy.
- Astronomical Observation: Enables precise measurements of celestial light.
- Magnetometry: Used in detecting magnetic fields with high sensitivity.
By integrating CASTECH PEMs into your systems, you will enhance the accuracy and reliability of polarization-dependent measurements, benefiting a wide range of scientific, industrial, and research applications.