CRASY

Correlated Rotational Alignment Spectroscopy

The PI Mercury™ C-863.10 and PI Mercury™ C-863.11

The PI Mercury™ C-863 is a DC-motor controller which exists in two versions, i.e., the C-863.10 controller and the C-863.11 controller. Both differ in their firmware and their hardware. That makes it difficult to control them using the same software. Here you’ll find some information on how to deal with the new General Command Set of the Mercury™ C-863.11 controller.

How to align a translation stage

Femtosecond spectroscopy uses an ultrashort laser pulse to start a photo-chemical reaction at a well defined moment in time. A second ultrashort laser pulse can be used to visualize the ongoing photo-chemical reaction [1]. To achieve a precise timing between two laser pulses, a laser beam is usually split into two parts. One part of the beam is directed towards the experiment, the second part passes a translation stage before recombination of both beams occurs. By precisely moving the translation stage by a certain distance, the pathway is increased and laser […]

Affordable translation stage for spectroscopy

The translation stage ‘Standa 960-0060’ sells for $399 and offers a full-step resolution of 1.25 micrometer (200 steps/turn, 250 micrometer per turn). With factor 8 or 16 microstepping, the resolution should be sufficient for interferometric experiments with visible light (156 or 78 nm resolution). The stepper can be easily controlled with an Arduino-based USB controller for a cost of less than $40, but a little soldering is required.

Arduino Based Sensors

Problem: We need to track environmental variables in our laboratory to identify parameters that affect our measurement results Solution:  We read out sensors using Arduinos and transfer the sensor data to PCs for storage and analysis. We programmed sensors to analyze temperature, humidity, air pressure, acceleration, and motion. For some sensors (e.g. temperature sensors), the program just involves reading sensor values. For other sensors (e.g., the BMP180 pressure and temperature sensor), a library is required to handle the communication with the sensor. Some programs were written in older Arduino IDEs and they may have to […]