Melles Griot (Carlsbad, CA) has introduced a series of single-frequency lasers that operate in the deep-blue spectral region. The 58 BTL diode-pumped solid-state (DPSS) lasers, which operate at 430 nm with a single longitudinal mode, produce low-noise, single-frequency output with less than two percent peak-to-peak noise. According to Dean Hodges, director of marketing and business development for DPSS products at the Melles Griot Laser Group, the violet wavelength is particularly suited for fluorescence and Raman spectroscopy, confocal microscopy, and DVD mastering applications. He adds that the long coherence length that results from the single-longitudinal-mode is ideal for long-path-length holography.
The DPSS lasers are available with output powers of 5 or 8 mW. The beam is nearly circular (a 1.25:1 aspect ratio), linearly polarized, and has an M2 factor of less than 1.3. The compact, conduction-cooled laser head incorporates thermoelectric cooling and automatic power control for stable long-term operation with power drift of less than 5 percent over 24 hr. Laser head dimensions are only 2.8 x 2.8 x 6.3 in., excluding cooling plate and beam circularization optics.
The 58 BTL series lasers are available in both OEM and CDRH/IEC-compliant configurations. Systems are available with free-space or fiber-optic beam delivery systems. Melles Griot also manufactures blue (457-nm), green (532 nm) and infrared (1064 nm) DPSS lasers with cw output power as high as 400 mW, 3 W, and 5 W respectively.
For information on these new laser systems, visit www.mellesgriot.com.