Teltec Pacific is a technical Sales and Service organisation serving the Semiconductor, Photonics and Optoelectronics Industries in Asia Pacific countries.



Ondax, Inc. is the market leader in the design, manufacture and marketing of high-performance holographic optical filters, wavelength-stabilized laser sources, and high-performance, THz-Raman™ Low-frequency Raman Spectroscopy Systems for a wide range of industrial, scientific, defense and consumer applications.  Our core technology is state-of-the-art Volume Holographic Gratings (or VHGs, also known as Volume Bragg Gratings or VBGs) – which are specialized optical filters  fabricated from proprietary photosensitive glass.  VHGs are exceptionally versatile optical components that provide wavelength stabilization, spectral and temporal control for lasers/laser-based systems, and dramatically enhance the optical performance and resolution of spectroscopy systems.  Our products enable our customers to make their lasers and optical systems, smaller, more portable, more efficient, less expensive and more environmentally stable and robust.

Low Frequency/ THz-Raman Spectroscopy SystemsOndax’s patented THz-Raman® Spectroscopy Systems extend the range of traditional Raman spectroscopy into the terahertz/low-frequency regime, exploring the same range of energy transitions as terahertz spectroscopy – without limiting the ability to measure the fingerprint region. The THz-Raman spectral region covers both Stokes and anti-Stokes signals from ±5 cm-1 to 200 cm-1, (or 150 GHz to 6 THz), which contain important structural information about the molecule or crystal lattice. This region reveals a new “Structural Fingerprint” to complement the traditional “Chemical Fingerprint” of Raman, enabling simultaneous analysis of both molecular structure and chemical composition in one instrument for advanced materials characterization.


One Sample, One System, One Answer

Low Frequency Raman Spectrum of Carbamazepine

Full Raman spectrum of the pharmaceutical Carbamazepine showing both the THz-Raman “Structural Fingerprint” and traditional “Chemical Fingerprint” regions. Note higher intensity, stronger differentiation, and inherent symmetry of THz-Raman signals.

Combining both composition and structural analysis eliminates the need for multiple samples and instruments, lowering capital, training and maintenance costs. These compact plug-and-play platforms can be integrated with virtually any lab-grade microscope or Raman system. With excitation wavelengths ranging from 488nm to 976nm, and a wide range of options and compatible spectrometers to choose from, an Ondax THz-Raman® system can be optimized to match any application.


Ondax’s patented1 SureBlock™ XLF Notch Filter Systems enable fast, clear capture of Raman spectra in the Low-Frequency (Low Wavenumber/THz regime (~5 cm-1 to 200 cm-1, or 150 GHz to 6 THz), using only a standard single-stage spectrometer. THz-Raman is powerful new technique for molecular and intermolecular structural analysis that is both simple and compact when compared to multi-stage or THz spectrometers, and represents a dramatic shift in the economics, efficiency, and ease of use of Raman spectroscopy.

The unique ultra-narrow band design of our patented2 SureBlock™ Notch Filters also delivers exceptionally high throughput of both Stokes and anti-Stokes shifts up to >5000cm-1 (>150 THz). This allows observation of low-frequency vibrational/phonon modes, differentiation of polymorphs and other structural characteristics of pharmaceuticals, nano- and bio-materials; trace detection and forensics analysis of explosives and chemical/biological threat agents; and characterization of industrial, polymers, petroleum, heavy metals, and geological samples.

The XLF is an integrated, pre-aligned, light-tight, double-notch system with selectable fiber- or free-space input and outputs, adaptable for use with any single-stage spectrometer. All XLF systems provide > OD 8 Rayleigh suppression, and are engineered for fast, flexible integration with a wide variety of existing commercial spectrometers microscopes, and Raman systems. Available at standard Raman wavelengths including: 488nm, 514nm, 532nm, 633nm, and 785nm, and 830nm, these compact, robust plug-and-play systems deliver incredible speed, resolution and ease of use, all at an extremely affordable price!