Harmonic Generators
Autotracker III
Standalone operation in a flexible, Autotracker III (AT-III) is a standalone servo system designed for frequency mixing of pulsed lasers in nonlinear crystals. The system automatically generates second and third harmonic ultraviolet (UV) wavelengths. It can also produce infrared (IR) wavelengths using difference frequency mixing. Flexible and modular. AT-III includes an optical assembly (with three versions to choose from) tethered to a handheld control unit. An RS-232 port enables control by an external computer for easy laboratory automation. The system works with all pulsed commercial lasers and a wide range of laser repetition rates. Operating coverage extends from UV wavelengths as short as 198 nm to IR wavelengths of 4.0 microns. The optical head can hold a variety of crystals. Compact and portable. With a footprint of just 8 x 12 in., the optical head easily fits on a lab bench where space is limited. The small size makes it easy to share between several different lasers. Intuitive operation. IR and UV conversion kits for the AT-III allow easy interchange between sum frequency mixing to generate UV light and difference frequency mixing to produce IR wavelengths. The handheld controller displays the tracking signal and crystal tilt angle, simplifying setup and finding the right phasematch angle in day-to-day operation. AT-III detects the generated wavelength and continually adjusts the crystal tilt for optimal output power. Software controls angular positioning, based on sensor feedback and user input. Handles multiple applications. AT-III is at your service for numerous applications, including second harmonic generation of scanning short-pulse lasers, multi-photon ionization, reaction kinetics, absorption spectroscopy, laser-induced fluorescence, resonant ion spectroscopy, and others. Technical Information The AT-III optical assembly contains the crystal positioning motor with gearing, optical components, photodetectors, microcontroller, and system power supply. The IR version requires a separate power supply for the photodetector. Accessories include UV and IR harmonic separators, a polarization rotator, and beam combiners and mounts.
Specifications The basic AT-III system consists of a controller and optical assembly in one of three versions:
Users specify version type and polarization of generated light, so that the beamsplitter is correctly oriented at the factory. Beamsplitter orientation may be changed in the field as needed. A complete mixing system includes the basic AT-III system plus wavelength-specific optical components mounted inside the optical assembly. Components include a nonlinear crystal and matching compensator block, plus reflective and color filters to transmit generated light and attenuate the mixed wavelengths. Input beam height is fixed at 4.25 in., but may be modified with an adjustable platform, legs, or a custom design. Model 5-304
Temperature Stabilized Harmonic Generation System Intended for applications frequency conversion crystal at elevated temperatures, Model 5-304 is a temperature stabilized harmonic generation system. It can be used for second harmonic generation, third harmonic generation, and fourth harmonic generation of Nd:YAG lasers. Features include:
Model 5-304 employs either KDP or KD*P crystals cut for the desired harmonic generation task. The crystals are protected by AR coated windows and are available a variety of aperture sizes. Beam Accessories
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