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WaveTrain® CW Frequency Doubler

WaveTrain® CW Frequency Doubler
2Pages

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Are you interested in a source of CW laser radiation in the deep UV? A lot of people have the same interest. There are many uses for continuous wave radiation at short wavelengths in both scientific research as well as in industrial applications. On the scientific side, you have Raman and high resolution spectroscopy as well as laser cooling and the study of wide bandgap materials. On the industrial side there are applications like the DVD mastering, writing of fiber Bragg gratings, and photoluminescence mapping. In spite of this interest, however, the development of a reliable, easy to use source of continuous wave laser radiation in the deep UV has been an elusive quest. To get sufficient CW power in the UV, one normally begins with a laser whose primary emission is in the visible or infrared regions of the spectrum. Methods of harmonic generation are then used to transform the primary beam to shorter wavelengths. Both intracavity and external cavity methods are in use today. Five years ago Spectra-Physics introduced a particularly elegant design using the intra-cavity technique with the all solid-state 532 nm Millennia®, the only truly industrial high power CW 532 nm laser available today. The use of intra-cavity techniques, however, is not always the method of choice. It cannot be used, for example, to produce the fourth harmonic of a laser and it presents difficulties when used to double single frequency ring lasers and diode lasers. Laser Analytical Systems (LAS) in Stahnsdorf, Germany has pioneered the development of external cavity frequency doubling techniques for CW lasers. The introduction several years ago of the patented DeltaConcept™ resonant cavity revolutionized the area of CW second harmonic generation. In September of 2000, LAS became a division of Spectra-Physics. With the respective strengths of the two companies, we are now able to accelerate the advancement of our deep UV technology in support of both the scientific/research and industrial areas. The DeltaConcept resonator is the key to the efficient production of stable CW radiation in the UV. This technology was developed originally for the WAVETRAIN™, a stand-alone SHG unit for research applications with CW single frequency laser sources. The DeltaConcept has also become the basis for our line of industrial lasers. In this LASERForefront we describe the DeltaConcept as an integrated part of the WAVETRAIN, an instrument designed for scientific research and R&D applications. Nevertheless, if you are interested in a reliable & robust source of UV CW radiation for an industrial application, read on. The DeltaConcept technology, at the heart of our industrial systems, will ensure that you get a robust, efficient, and reliable source of UV power, regardless of whether you use it for R&D or for your industrial process. DeltaConcept Cavity So, just what have we done to make the WAVETRAIN an attractive instrument to use? As mentioned above, the heart of the WAVETRAIN is its DeltaConcept resonant doubling cavity. This is the key to low noise power output, scanning operation without fall-outs, while delivering maximum SHG efficiency. Take, for example, the shape of the A robust, reliable method for producing CW UV radiation Figure 1. The WAVETRAIN external cavity frequency doubler for CW Lasers. A Monthly Update On The State Of Technologies In The Laser Industry 2001 No. 29

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cavity itself: it's triangular with two mirrors and a prism. The prism, attached permanently to a Piezo element, is used to adjust the effective length of the light path in the resonator. The low mass of the prism allows the servo feedback loop to react with a much faster time constant than traditional bow-tie cavity arrangements where a heavy mirror mount has to be translated. This faster response time gives you much lower optical noise and precludes power fall-outs caused by low frequency laboratory vibrations. An additional benefit of using a prism to adjust the length of the light path...

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WaveTrain® CW Frequency Doubler 2Pages

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WaveTrain® CW Frequency Doubler
2Pages