VHG Volume Holographic Gratings

Ondax VHGs are bulk “solid-state” diffractive holographic filters, which unlike thin films or gels, can deliver ultra-stable, degradation-free performance for the lifetime of the filter. Capable of very tight wavelength, efficiency, bandwidth, and diffraction angle control, Ondax VHGs can be precisely and reproducibly engineered to demanding spectral and temporal specifications.  These filters enable a broad range of high-performance products and applications across industrial, defense, life science and research market segments. 

PowerLocker® Wavelength Stabilization Gratings

Volume Holographic Gratings
PowerLocker® wavelength stabilization gratings are designed to reflect a specified wavelength at a given reflectivity, locking the emission wavelength, increasing spectral brightness, and improving environmental performance of laser diodes. The short external cavity enabled by the PowerLocker® provides better mode selection than systems based on Littrow or Littman cavities at a much lower cost. Available in wavelengths from 375nm to 2.7µm, efficiencies from 5% to >99%, and bandwidths from 0.03nm to 1nm to match any application requirement.
Read more…

SureBlock™ Ultra Narrow-Band Notch Filters

Ondax SureBlock™ ultra narrow-band notch filters are the ideal solution for highly selective wavelength applications like low frequency Raman spectroscopy. With laser line attenuation of up to 99.9999% (optical density: OD4) and transition width of <10 cm-1, SureBlock™ filters can dramatically improve the ability of any Raman system to resolve low frequency Raman scattering. High transmittance on both sides of the notch enables both Stokes and anti-Stokes Raman spectra to be observed simultaneously. Designed to fit into standard 1” optical mounts.
Read more…

NoiseBlock™ Beamsplitters and ASE Filters

Ondax NoiseBlock™ ASE (Amplified Spontaneous Emission) Filters suppress the broad spectrum of spontaneous emission from laser diodes to provide a pure, ASE-free, single frequency laser output. The ASE Filter is a reflective VHG with bandwidth of less than 150 pm and throughput greater than 90%. The VHG is manufactured with a slant that provides an angular separation between the specular reflections from the surface of the VHG and the filtered laser beam. Available in both free-space and fiber-coupled configurations.Read more…

Ondax NoiseBlock™ 90/10 Beamsplitter Filters are designed to diffract 90% of the incoming light that matches the  designed Bragg wavelength and incident angle.  All other wavelengths will be transmitted through the filter, making them excellent for boosting the effective signal of a Raman spectrometer.  Read more…

PicoPulse™ Pulse Stretcher/Compressor Filters

Pulse Compression Filter Ondax PicoPulse™ pulse stretcher/compressor filters enable high peak power in femtosecond pulsed laser systems, with a distortion free round output beam. PicoPulse™ filters allow larger input beams to be used with many orders of magnitude higher power than chirped Fiber Bragg Gratings (FBGs). Ondax’s proprietary packaging is designed to minimize the spatial chirp commonly found in chirped volume holographic gratings (CVHGs). This robust, compact format is less complex than equivalent dispersive diffraction grating pairs, which require multiple components with precise alignment adjustment. The output is stable over a wide range of temperatures, with nearly diffraction limited beam quality.
Read more…

CleanLine™ ASE Filter Systems and Lasers

Ondax CleanLine™ Series ASE Filter Systems are a family of tightly integrated, pre-aligned, multi-element ASE Filter Modules designed to provide the enhanced narrow band, low noise, ASE-free laser performance required for ultra-low-frequency Raman spectroscopy, and other demanding spectroscopy or metrology applications. Configured for fast, easy alignment and use with our SureBlock™ XLF Series Raman Filter Systems, the CleanLine™ family is based on our proprietary NoiseBlock™ solid-state, ultra-narrow band Volume Holographic Filter technology, delivering unlimited lifetime, exceptional throughput, and ultra-stable environmental performance. Read more…