HINDS DPEM-460A Electro-Optic Modulator

HINDS DPEM-460A Electro-Optic Modulator
I. Basic Product Information
Brand: HINDS Instruments (a manufacturer of polarization, spectroscopy, and optical precision instruments from the United States)
Model: DPEM-460A
Product Type: Dynamic Polarization Electro-Optic Modulator (Pockels Cell type)
Typical Application Fields: Ellipsometer, Polarization Spectroscopy Measurement, Optical Precision Inspection, Semiconductor Film Characterization, Laser Polarization Modulation, Research Laboratory Optical System.
Model Meaning
DPEM: Dynamic Photoelastic Modulator
460: Adapted to the central working wavelength of 460nm (blue light band)
A: Standard Commercial General Version

Core Optical Parameters
Working Wavelength Range: 420nm – 500nm, Center Nominal 460nm
Modulation Fundamental Frequency: 50kHz Standard Resonant Frequency
Half-Wave Voltage (Typical): Approximately ±400V
Aperture: Conventional 3mm
Polarization Modulation Precision: Nanometer-level Phase Modulation, Absorption Ratio > 1000:1
Inlet Light Beam Requirements: Parallel laser beam with the polarization direction aligned with the modulation axis

Hardware Structure and Interfaces
Optical Input / Output: Two ends with precise positioning for collimated optical windows, compatible with optical flanges, fiber coupling seats
High-Frequency Drive Signal Interface: Special high-voltage RF connector, requires HINDS original drive power supply / signal generator for use
Precise Positioning Base: Compatible with optical platform M6 thread installation, capable of three-dimensional fine adjustment for pitch, translation, and rotation, used for optical path alignment and calibration

 Main Function Principles
Based on the photoelastic effect, under the action of high-frequency alternating electric field, the crystal’s birefringence characteristics are changed, performing periodic phase and polarization state high-speed modulation on the incident linearly polarized light, and combining with a lock-in amplifier to achieve weak polarization signal demodulation:
Used for spectral ellipsometer measurement of film thickness, refractive index, extinction coefficient
High-speed switching of laser polarization state, weak circular dichroism, magneto-optic, and optical rotation measurement
Precise optical polarization detection, non-destructive analysis of semiconductor wafer surface films
V. Environmental and Usage Requirements
Operating Temperature: 20 ± 5℃ constant temperature environment. Temperature drift will directly affect modulation accuracy
Shock Resistance Requirements: Must be fixed on an optical shock-proof platform. Minor vibrations will cause a decrease in the signal-to-noise ratio of the optical path
Storage Environment: Dry and dust-free, avoiding scratches on the window lens and condensation pollution
Protection: The optical end face must not be touched by hand. Cleaning requires the use of professional optical dust-free paper + isopropyl alcohol wiping

Required Supplementary Equipment
HINDS High-Frequency High-Voltage Drive Power Supply (corresponding to the DPEM series dedicated driver)
Lock-in Amplifier (for weak modulation signal demodulation and acquisition)
Polarizer, 1/4 Wave Plate, Collimated Laser, Optical Adjustment Stand

Application Scenarios
Core optical components of semiconductor, photovoltaic film ellipsometry testing equipment
University, research institute polarization spectroscopy, circular dichroism experiment systems
High-precision laser polarization detection, material magneto-optic characteristic characterization equipment
Wafer, optical coating thickness and optical parameter non-destructive detection instruments