Conoptics 350-50 Phase Electro-Optic Modulator

The Conoptics 350-50 is a phase electro-optic modulator employing KD*P (Potassium Dideuterium Phosphate) crystal material for dynamic optical phase modulation. Operating with a transverse electric field configuration, this device delivers phase modulation through full-cell activation when aligned inline. The modulator supports multiple functional modes—intensity modulation, polarization rotation, and voltage-variable waveplate operation—though configuration as a phase modulator is irreversible. With a half-wave voltage of 450 V for 180° phase shift and phase sensitivity of 7 mrad/volt at 500 nm, the 350-50 covers the 240 nm to 1100 nm wavelength range.

## Technical Specifications

• **Crystal Material:** KD*P (Potassium Dideuterium Phosphate)
• **Modulation Type:** Phase electro-optic (transverse field)
• **Half-Wave Voltage (V½):** 450 V (180° phase shift)
• **Phase Sensitivity:** 7 mrad/volt at 500 nm
• **Modulation Bandwidth:** DC to 250 kHz; DC to 50 kHz at 900 nm; DC to 250 kHz with 85% transmission at 830 nm
• **Wavelength Range:** 240 nm to 1100 nm
• **Aperture Diameters:** 2.7 mm, 3.1 mm, 3.5 mm (maximum beam diameter 1.8 mm at 1/e² for 2.7 mm aperture)
• **Electrical Field Orientation:** Transverse (perpendicular to optical propagation)

## Key Features

• Single, permanent configuration as phase modulator eliminates reconfiguration capability
• Operates across ultraviolet through near-infrared spectrum
• KD*P crystal balances optical bandwidth and driver frequency response between ADP and LTA alternatives
• Push-pull drive architecture supporting BNC or twinax connector configurations

## Typical Applications

• Phase modulation in laser systems
• Pulse picking for ultrafast laser applications
• Optical signal processing

## Compatibility & Integration

Conoptics driver electronics (Models 10, 25, 50, 100) interface via 50 Ω impedance. DC-coupled broadband amplifiers require 1 V peak-to-peak input at 50 Ω for full-rated output. Single-ended (SMA) or balanced line (twinax) driver configurations available.