The Autotracking-FCU operates in combination with any pulsed laser system. It is used for second-harmonic generation (SHG), third-harmonic generation (THG), sum- and difference frequency mixing (SFM, DFM). All these processes require precise matching of the fundamental wavelength and its harmonic in the non-linear crystal. This is done using a high resolution rotary stage. A second stage is used for synchronous rotation of a compensator. The phase matching is measured by a two-area pyroelectric detector.
This detector operates over a broad spectral range from 12 µm down to 190 nm. A built in microprocessor circuit controls the unit’s stepper motor in such way that optimal conversion efficiency is maintained during wavelength scans and temperature changes. The adjustment and operation is controlled by Sirah’s Autotracker software running on every Windows based PC, using a serial port for communication. The software accepts commands via TCP/IP allowing control by all kinds of programs. If sensor based tracking fails, a look-up-table algorithm can control the Autotracker. Please note that wavelength separation (Pellin-Broca Unit, filters) is not included, but required for operation.
|Outer dimension||564 mm (w) x 495 mm (d) x 250 mm (h)|
|Laser beam height||209 .. 243 mm|
|Power Supply||100 .. 250 V, single phase, 50 / 60 Hz|
|Maximum repetition rate||100 Hz|
|Crystal rotation axis||horizontal or vertical (changeable)|
|Maximum scan speed||0.5 nm / min @ 10 Hz|