PRODUCT FOCUS RAMAN SPECTROSCOPY Good Raman vibrations
A round-up of the latest equipment for Raman spectroscopy, including complete spectrometers as well as components for Raman systems
Avantes now supplies its AvaRaman-Supreme series Raman spectrometers, which offer high sensitivity combined with high resolution – Avantes claim the device has up to six times the sensitivity of a comparably priced Raman system. By redesigning the optical bench, and especially the light entrance, more than 95 per cent of the light coming out of the fibre optic cable reaches the detector. The standard solution with an entrance slit only sees 15 per cent of the photons reach the CCD, according to Avantes. AvaRaman-Supreme-TEC series spectrometers
have a three-stage Peltier cooling system, which provides ∆T down to -30°C cooling to ambient for superior dark noise reduction, keeping the detector at a steady 5°C. Thanks to the PID controller, this temperature is stable within a 0.1°C bandwidth. All AvaRaman systems are delivered with AvaSoft- Raman software.
www.avantes.com
BaySpec has released its Raman analyser, the Agility. The instrument employs a highly efficient Volume Phase Grating (VPG) as the spectral dispersion element, which is customisable to any wavelength range. It uses a cooled, scientific-grade detector array (532/785nm CCD or 1,064nm InGaAs) as the detection element.
Choices of auto-aligned sampling accessories
are available, including: vial holder, pill holder, direct focus and fibre optic. A simplified user interface means users can verify sample ID easily, automate background subtraction and baseline correction, set integration times and configure user libraries. The Agility is a transportable Raman analyser offering a dual-band option. BaySpec’s dispersive 1,064nm excitation
CryLaS offers the FQCW-266 series of CW lasers at 266nm with up to 200mW output power, ideal for use in UV Raman spectrometers. The lasers are based on a patented design to stabilise the emission wavelength and reduce the output noise. A diode pumped Nd:YVO4 laser followed by a resonant frequency quadrupling stage are integrated in a robust housing. Various models with output power of 10mW up to 200mW are available. The single frequency DUV radiation emitted at 266nm has a large coherence length of more than 1,000 metres, and a narrow line width of less than 300kHz. In this way, high resolution spectra can be acquired in UV Raman systems
option provides reduced fluorescence interference and higher prediction accuracy. The company’s Agility2020 software allows users to add new substances to the library or interface easily with third party libraries. Security is enhanced through 21 CFR Part 11 compliance.
www.bayspec.com
Cobolt, a Swedish manufacturer of high performance lasers, has released a Class 3B model of the single frequency Cobolt Rumba 1,064nm laser, ideally suited to demanding applications such as Raman spectroscopy. The 04-01 series laser is now available with up to 400mW CW output and offering a slightly more compact footprint than the previous 05-01 series, in addition to being Class 3B. The Cobolt Rumba 04-01 offers a high quality TEM00 beam (M2
<1.1). The laser cavity design
provides ultra-low noise performance of typically less than 0.25 per cent rms (over a range of 20Hz to 20MHz and 10mC to 40mC), a narrow spectral linewidth of less than 1MHz, and immunity to optical feedback.
The laser is manufactured using Cobolt’s HTCure technology in a compact and hermetically sealed package, providing exceptional reliability. Lasers built using the HTCure technology can withstand multiple 60G mechanical shocks and exposure to extreme temperatures (>100mC), as well as being insensitive to pressure and humidity. A compact controller (CDRH or OEM) is supplied with the laser and can be accessed remotely for operation and monitoring of the laser system over RS-232 or USB interfaces.
www.cobolt.se
32 ELECTRO OPTICS l APRIL 2014
Hamamatsu’s new series of back-thinned CCDs has been specifically designed to reduce this etaloning effect, making it suitable for a wider range of applications, with a particular emphasis on improving the performance of current Raman spectrometer systems.
The module consists of a palm-top size polychromator, integrated with optical elements. The back-thinned CCD sensor is optimised for the wavelength range and comes with integrated image sensor driver circuit. The spectrometer module includes both sample software, DLL
@electrooptics |
www.electrooptics.com
where fluorescence is effectively suppressed due to the UV excitation. The laser uses a double sealed laser head and an integrated crystal shifter for high reliability, excellent stability, and long service intervals.
www.crylas.de
Hamamatsu Photonics has introduced the latest members of its TG series of mini-spectrometers, the C11713CA and C11714CA. As well as having very high sensitivity, both modules offer a very narrow spectral resolution of 0.3nm, making them ideal for Raman spectroscopy applications. The C11713CA works over the spectral range from 500nm to 600nm, with the C11714CA operating from 790nm to 920nm.
The modules use Hamamatsu’s newly
developed low etaloning back-thinned CCDs. Conventional back-thinned CCDs can exhibit etaloning in the near infrared region, which is problematic in certain Raman applications.
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