Single longitudinal mode (SLM) laser from Oxxius for Raman spectroscopy

For low-noise Raman spectra in which, for example, secondary phases can be detected or in which small sample quantities can be analyzed, long integration times and often additional accumulations of several measurements are usually required. To reduce both, a very stable laser is required. Inelastic scattering of light due to the Raman effect is significantly less efficient than, for example, absorption due to molecular vibrations in infrared spectroscopy.

In order to sharply resolve the bands obtained in the Raman spectrum, a radiation source with

• high brilliance
• a very narrow line width
• a stable excitation wavelength

Lasers can “drift” in their wavelength and also in their output power over time, whether due to thermal influences within the laser or from outside. The diode-driven solid-state lasers (DPSS) from Oxxius therefore have a resonator at their heart, which consists of a single connected optical system, the alignment-free monolithic resonator (AMR). At the level of the crystal surfaces of the individual elements, these are bonded together without adhesives and function as a single robust component. This enables a stable laser that is inert to vibrations during operation (such as cooling), as well as to fluctuations in temperature.

The two lasers from Oxxius designed specifically for Raman spectroscopy are the LSX-785S-ISO-150 and LBX-785S-MM. Depending on the required power or line width, both have their advantages, which we will be happy to weigh up with you for your application.
In addition to the most commonly used laser wavelength, there are also lasers for Raman spectroscopy at 532 nm, as well as 830 or 1064 nm.

Send us your request: m.schaefer@mphotonics.de