Low frequency Raman bands (below 50cm-1) exist in certain proteins. Both thin films and crystals depend on the conformation of protein molecules, but are relatively independent of the form of the sample

In amorphous glass, most Raman spectra exhibit a low-frequency response called the "boson peak"

Many minerals exhibit low-frequency vibration modes, with sulfur between 0-250cm-1 or organic substances such as L-cysteine between 0-800cm-1

Single walled and multi walled carbon nanotubes exhibit radial breathing mode (RBM) vibration in the range of 150-200 cm-1, used to characterize the diameter distribution and overall mass of nanotubes, as well as the influence of external factors

Evaluate the quality of semiconductor multilayer structures (superlattices) by observing folded acoustic (FA) modes in the range of 0-100 cm-1

Relaxation modes in liquids, binary mixtures, and solutions help determine their dynamic structures in the range of 0-400 cm-1

Application of Ultra Low Frequency Raman Spectroscopy

● Drug polymorphs ● LA mode of polymers ● Materials: phase/structure

● Metal halides ● Gases ● Carbon nanotubes

● Micro nano crystals ● Semiconductor lattices and nanostructures

The main advantages of BNF and BPF

Low wavenumber Raman spectroscopy measurement with filtering bandwidth as low as 5-1cm

Compared to traditional three grating Raman spectrometers, it has higher efficiency, reaching over 50%

Compared to traditional three grating Raman spectrometers, the cost has significantly decreased

● Polarization independent

CW Blue and Green Single-Frequency Lasers Sapphire SF lasers are intended for applications that need narrow and ultra-narrow linewidth light such as Raman spectroscopy, interferometry, holography, metrology, and inspection.

● Ultra-narrow linewidth ● Outstanding power stability ● Superior beam quality

● High single-frequency power 1) Up to 100mW at 488nm 2) Up to 150mW at 532nm

● Ultra-low noise, esp. no discharge background or green noise (cf. ion, diode, DPSS lasers)

Ondax SureBlock ™ XLF System

Low wavenumber attachment