SMD Light Modulators

for ultra compact Laser systems

The union of electronics with optics and their miniaturisation plays a much bigger role than just the massive reduction in complexity, size and susceptibility in today‘s industrial plants and systems. An establishment of Quantum Technology (QT) in industry, aerospace or daily life will fail without considering the industrial implementation of those highly sensi- tive and complex systems. QUBIG offers a new family of free-space light modulators compatible with SMD mounting technology to facilitate the integration into complex systems.

SMD EOMS

The modulators are built for easy integration into electronic and optoelectronic setups. They are easy to implement on printed circuit boards (PCB) by either soldering, gluing, or wire bonding and show an intrinsic small alignment sensitivity. Additional op- tions for RAM suppression, frequency fine-tuning, high optical power handling, or high modulation efficiency are available.

**Fig. 1** | *SMD compatible phase modulators resonant at 20 MHz (right) and 6.8 GHz (left).*

SMD EOMS + DRIVER

The compact form factor and SMD mounting allow for the integration of the light modulators directly on the RF-source electronics powered by a USB connection. This package not only eliminates bulky drivers but also improves the overall efficiency since there are no transmission losses in coaxial cables for high frequencies.

**Fig. 2** | *SMD compatible phase modulators with integrated driver resonant at 20 MHz (right) and 6.8 GHz (left).*

OPTO-ELECTRONIC INTEGRATION

Ultra-compact electro-optical modulators can be integrated into robust electro-optical assemblies that offer a high degree of complexity with minimum dimensions. For instance, Fig.3 shows a compact EOM integrated inside an ultra-narrow linewidth diode laser module developed by the Ferdinand Braun Institute and Fig. 4 shows a compact Laser Conditioning Module for Fre- quency-modulation spectroscopy (LCM-FM) with an integrated SMD EOM.

**Fig. 3** | *SMD EOM integrated inside an a ultra-narrow linewidth diode laser module.*

The compact LCM-FM module (14x3.6x11cm³) as execution example for characterisation and demonstration purposes of our SMD product line, contains a tunable SMD Phase modulator working at 20 MHz to generate an error signal via FM-spectroscopy of an alkali metal (currently Cs and Rb).