Additional Resources
- “Multimode vs. Single-Mode Lasers for Raman Spectroscopy“
- “How Does Concatenation Enhance Raman Spectroscopy“
- “Stabilized vs Unstabilized 976 nm Laser Pump Lasers“
Volume Bragg Grating (VBG) Laser Diodes are a special type of laser diode that provides wavelength stabilization and narrow linewidth.
As opposed to diffraction gratings (made on the surface of an optical element) Volume Bragg Gratings are written on the inside of the material. Furthermore, the grating is usually placed not directly in front of the laser diode but after a collimating lens. In short, this is important for pumping of certain solid-state lasers, where the laser crystal exhibits efficient pump absorption only in a narrow wavelength range. Typically, the Volume Bragg Grating’s end faces are optically polished, with an anti-reflection coating applied, to help prevent parasitic reflections.
A common use for Volume Bragg Gratings is the production of wavelength stabilized laser diodes. The addition of a VBG to a laser diode creates additional optical feedback to the diode laser, forcing it to emit laser light that is within the narrow optical bandwidth determined by the VBG. Basically, this means that the mean wavelength output of the laser diode is fixed, for all intents and purposes.
Without this feedback, the laser diode would be subject to wavelength shift due to temperature changes, as well as changes due to increasing age of the laser diode. Finally, this method allows for the reduction of total optical bandwidth from, say, a few nanometers, down to some fraction of a nanometer, which is beneficial to solid-state laser pumping, Raman spectroscopy, and other applications which require a narrow linewidth, wavelength stabilized laser diode.
Our Volume Bragg Grating Laser Diodes provide Narrow Linewidth, CW output in the Red and Near Infrared (NIR) spectral regions. Furthermore, these laser diodes provide up to 750mW for our Single-mode options and up to 400W for our Multimode options. Finally, we provide options for free-space or fiber-coupled output and package options, including TO-can, butterfly and more.
The R series of wavelength stabilized single–mode and multimode laser diodes offer narrow linewidth output in wavelengths from 633nm thru 1064nm. This highly customizable series offers package options ranging from components as basic as a TO-56 or 14-pin BF packaged diodes, to OEM modules including electronics, to UL/CE and IEC certified turn-key systems. The R series is the perfect source for various markets, including chemical analysis, bio-medical, fiber laser, and scientific applications.
The RPK Series of multiple, single-emitter fiber-coupled diode lasers are available in wavelengths from 405nm thru 1550nm with up to 300W output power. Our specialized fiber-coupling techniques ensure high efficiency, stability, and superior beam quality, while rigorous inspections and burn-in procedures guarantee each product’s reliability, stability, and long lifetime. Highly customizable packages allow us to meet our customers’ specific needs, providing high-quality products at reasonable prices.