Newport Spectra-Physics Newsletter - #31 - November 2009 - (Page 25)

w w w. n e w p o r t . c o m November 2009 Page 25 Raman Microspectrometer Key Features Easy and compact solution for Raman Spectroscopy High signal to noise ratio and short sample exposure time (up to a second) High resolution (3 cm-1 or better can be easily achieved) Easy to customize with different laser sources and detectors Photograph of the Raman Microspectrometer setup in the Newport TAC. The laser is shown in green, while the Raman scattered field is shown in orange. Newport’s Technology & Application Center (TAC) Raman Microspectrometer is easy to assemble and an alternative solution to many commercial Raman systems available in today’s market. The flexibility to integrate different lasers and components makes this an excellent set up for research and development work or in a production lab without adding too much cost. This spectrometer can be used to separate peaks as close as 3 cm-1 and has very good signal to noise ratio. The setup is based on a 532 nm CW single frequency DPSS laser (Excelsior®, Spectra-Physics) as the light source. Lasers with longer wavelengths are more preferable in Raman experiments since some of the fluorescence can be avoided. For example, Newport’s 785 nm Raman Laser Module, would be an appropriate choice. Figure 1 shows the homebuilt Raman microspectrometer system used in Newport’s Technology & Application Center (TAC). The laser beam passes through a variable attenuator (Application Note #26) used to control the laser intensity. Then the beam is routed into a 45° dichroic beamsplitter. The beamsplitter has to be set exactly at 45° to the incident beam in order to maximize the reflection of the Applications Analytical Chemistry Surface Chemistry and Material Science Characterization of variety of samples including liquids, films, and powders light source into the sample and transmission of the Raman scattered signal, as well as minimize the transmission of the back-reflected laser beam. Without employing a microscope at this stage, the laser beam can be focused by a simple lens into the sample situated on XYZ stages. In the setup described in this application note, the laser beam is routed into a microscope and then focused in the sample by an objective. The sample is held on the XY observation platform of the microscope and the focal point is controlled by adjusting the height of the objective. A P P L I C A T I O N S O L U T I O N S M W P M Excelsior, 532nm M Z ES M S X L2 Z L1 Y A diagram shows the principle of the experimental setup. M: mirror, W: waveplate, P: polarizer, S: sample, F1: 45° beamsplitter, F2: long wave pass filter, L1: objective or lens, L2: condenser lens, ES: entrance slit of the spectrometer. The dashed circle marks the attenuator. M WEB Download the Application Note. Please click here. WEB See our website for more info. Please click here. 93 amily of Brands — Corion® • New Focus™ • Oriel® Instruments • Richardson Gratings™ • Spectra-Physics®

Table of Contents for the Digital Edition of Newport Spectra-Physics Newsletter - #31 - November 2009

Cover and Contents
- Newport Corporation Starts Direct Selling of New Focus Products in Europe
- Mai Tai® SP Short Pulse One Box Amplifier Seeder
- Spitfire® Pro XP 7 W Ultrafast Ti:Sapphire Amplifier
- TLB-7000 StableWave™ Tunable Lasers
- TA-7600 Series Tapered Amplifiers
- SCG-800-CARS Supercontinuum Generation Fiber Device
- Newport 3700 High-Power Temperature Controller
- Newport High-Power Laser Diode Control Kits
- Do You Need to Modulate Your Beam?
- High-Damage-Threshold Phase Modulators (KTP)
- New Focus Amplitude Modulators
- New Focus 981x Stability™ Top and Center Mounts
- New Focus Flipper™ 1” and 2” Optical Mounts
- Open Cage System
- Newport Broadband Metallic Mirrors
- Ultra-Broadband Dielectric Mirrors
- Ultrafast Laser Super-Broadband Turning Mirrors
- New Focus UV Excimer Mirrors
- New Focus Nd:YAG Mirrors
- S-2000-TC Stabilizer™ Isolators
- LABasix™ SA2 Series Aluminum Breadboards
- Picomotor™ Actuators
- iPico™ New Focus Intelligent Picomotor Modules
- New Focus Kinematic Stages
- Motorized Kinematic Stages
- New Focus GuideStar™ Beam Stabilization
- UMR-TRA XY Compact Motorized XY Stage
- URB100CC High-Speed Precision Rotation Stage
- HXP100-MECA Newport Hexapod
- Motion Control Capability Brochure
- 818P-500-55 500 W Fan-Cooled Thermopile Detector
- 818P-3KW-060 Water-Cooled Thermopile Detector
- 818P-001-12NIR Thermopile Sensor, 1 μW–1 Watt
- LBP-HR High Resolution CCD Laser Beam Profiler
- 80 MHz Balanced Photoreceivers
- Nirvana™ 125 kHz Auto-Balanced Photoreceivers
- LED Scribing The Illumination Revolution
- Oriel® IQE-200™ Quantum Efficiency Measurement System
- PVIV-TC-VAC Temperature Controlled Vacuum Chuck KitMémentos - LMD
- Workstation for Laser Direct-Write Processing
- Photoresponse Mapping of Photovoltaic Cells
- Raman Microspectrometer
Literature Request

Newport Spectra-Physics Newsletter - #31 - November 2009