EO Sampling device

Partow THz E-field sensor uses Mach-Zehnder modulators made from lithium niobate thin films for sensing of electric fields. The sensors can achieve high spatial resolution and can operated form near DC frequencies up to several THz. The sensor is made from all dielectric materials. Hence it does not perturb measurand electric field. Also, since fiber optic cables are used no alignment is needed and the sensor can be readily placed in THz beam path for sampling of THz signals. The sensor operates at an eye safe wavelength of 1550nm. The device can be used to replace bulky electro-optic sampling crystals in THz time domain spectroscopy applications.

Features

Based on thin film lithium niobate
Electro-optic Mach-Zehnder modulator
DC frequency up to THz frequencies

All dielectric materials
Immune from electromagnetic interference
High spatial resolution

Mach-Zehnder THz sensor, P/N MZ-THz-600-Q-B

Parameter	Value	Additional Information
Dynamic range	*10V/m – 2MV/m*	*Typical using standard lasers and detectors*
Sensitivity	*10V/(m. Hz ^0.5)*	*Measured at low frequency using standard DFB lasers*
Selectivity (Orthogonal components rejection)	*>30 (dB)*
Optical insertion loss of the sensor	*-12 (dB)*
Operating wavelength	*1550 (nm)*
-3dB Bandwidth of optical coupler	*50(nm)*
-3dB modulation bandwidth*	*3(THz)*	*Up to 10THz bandwidth is possible*
Active interaction length	*600 microns*
E_p	*23 MV/m*	*Electric field value to change output from complete on to off state*
Packaged sensor size	*3(mm) x 3(mm)*
Fiber length	*1(m)*
Fiber type, conector	*3 PM, FC/PC*	*Laser input and two fiber output for balanced detection*

*Theoretically calculated value