TOPTICA TopMode single-frequency diode laser series

TOPTICA has introduced wavelengths at 445 and 447 nm into its TopMode single-frequency diode laser series, suitable for high-resolution Raman spectroscopy, microlithography, multi-wavelength digital holography and interferometry. The products operate as easily as HeNe lasers, the company claims, but offer higher power and the choice of wavelength.

The series offers high levels of power, coherence and wavelength stability. The proprietary CoHerence-Advanced Regulation Method (CHARM) provides an active stabilisation of the lasers’ coherence and enables continuous single-frequency operation.

The short wavelengths provided by the TopMode 405 lasers are particularly suited to Raman spectroscopy of inorganic materials, for which no fluorescence obscures the Raman signal. Raman intensity depends on the excitation wavelength by a factor 1/λ4. TopMode lasers at 405 nm allow strong Raman signals that remain detectable by Si-based detectors.

In digital holography, the topography of a surface is measured by recording an interference pattern using several, carefully selected wavelengths. TopMode lasers are available with wavelengths customised to the user’s application.

Other key features include easy OEM integration and the ability to make repeatable, high-resolution measurements.