Ultraviolet Helium Cadmium Lasers (325nm)

Melles Griot ultraviolet HeCd lasers are available in two configurations. Polarized systems use an external resonator cavity that provides exceptional beam quality with a 500:1 extinction ratio. Unpolarized laser systems use an internal mirror configuration that requires no optics cleaning for the life of the system.

325nm Linearly Polarised Lasers

Polarized helium cadmium lasers from Melles Griot are ideal laboratory instruments. They incorporate dual Brewster windows to ensure optimum polarization, and the NoiseLock™ feature, standard with most of these lasers, allows the user to suppress beam noise by an order of magnitude over specifically desired frequency ranges. Features include:

• Linear polarization with >500:1 extinction ratio
• Output power to 5 mW
• Unsurpassed mode quality with M² < 1.10 on TEM₀₀ versions

These products do not meet the European standards for CE certification and therefore should not be purchased for use within the European Economic Area (EEA).

325nm Randomly Polarised Lasers  

Unpolarized helium cadmium lasers from Melles Griot are ideal sources for automatic optical inspection, biomedical fluorescence detection, confocal microscopy, wafer inspection, and a wide variety of other applications. These systems exhibit excellent pointing stability and mode quality as well as long operational life. Our unpolarized HeCd lasers incorporate a unique internal mirror design coupled with a rugged Invar external support structure that eliminates the losses introduced by optical windows. The result is a system that has exceptional output power for its size, and, from a cold start, reaches full power and stability in just 15 minutes. The Invar support structure provides outstanding long-term power and pointing stability, ideal for scanning applications. 220-, 230-, and 240-Vac systems are CE compliant. Features include:

• Output power to 55 mW
• Pointing stability better than 20 μrad
• Excellent mode quality with M² < 1.2 on TEM₀₀ versions
• CE and CDRH compliant
• Universal voltage input