PHOTONICSTECHNOLOGIES

SPECTROSCOPIC ESSENTIALSFOR YOUR SPECTROSCOPY SOLUTIONS

www.photonicstechnologies.com

MODULATION AND DETECTION

Photonics Technologies are able to supply a variety of Electro-Optic Modulation (EOM) systems for electronicallycontrolled phase and amplitude control of laser light including: Laser Power Controllers, Phase Modulators, Electro-Optic Amplifiers and Signal Generators.

EOM Series� Fixed frequency modulation without high voltage drivers.

� Fits into standard 1’’ mirror mount for easy integrationinto your optical system.

� Ideal to combine with spectroscopic cells for laserlocking to atomic or molecular transitions.

PD-A Series� High sensitivity and low noise photodiodes with a built in amplifier, simplifyingdetection of low signals.

� Fits into standard 1’’ mirror mount.� Perfect for use with the EOM series for frequency modulation laser locking.

Complete your set up for a fully functional system:

� Oscillator, the TTi TG120, is low cost, has excellentfunctionality and proven reliability.

� In the situation where you already have an oscillator butthe power may be too low for sufficient modulation evenwith our high-Q resonant circuit design you may requiresignal amplification. Our Electro-Optical Amplifier (EOA-01) is a cost effective way to complete your set-up.

OPTIONS

ELECTRO-OPTICAL MODULATION

APPLICATION

� Fixed frequencies between 3-25 MHz

� AR-coated for 400-700nm, 650-1000nm, or 1000-1500nm

� MgO crystals for higher damage threshold

� RF generator

� RF amplifier (if required)

� The Photonics Technologies EOM is the perfect solutionfor use in research when wavelength stabilisation ofsingle-frequency laser beam is required.

� Applications include the generation of side-bands onsingle-frequency lasers for high resolution lockingtechniques, such as pound drever hall locking, andfrequency modulation saturation spectroscopy. In thiscase the EOM will modulate a probe beam, while leavingthe main beam unmodulated.

� A very common application for an EOM is for stabilizationof an optical resonator.

APPLICATION

� Wavelength sensitivity 300 - 1100 nm (other ranges upon request)

� Detection of transmitted laser power in absorption spectroscopy.

� Combine with the EOM and suitable locking electronics for a top-of-fringe lock toan atomic transition or cavity.

AMPLIFIED PHOTODIODES

OPTIONS

BEAM CONTROL

Obtaining repeatable and accurate results from your experiment requires precise control of the laser beam. Boththe power and the positional stability of the beam are parameters of key importance.

Photonics Technologies can help you gain control of the laser beam with our laser power stabilisers and extremelystable opto-mechanics.

OPTIONS

APPLICATION

� Remote detectors for 325 – 1700 nm

� Custom, high power and OEM versions available

� Ideal for applications such as reducing intensity noise ona Ti:Sapphire or pump laser

� Achieve precise powers for single molecule experiments� Improve transmission and scattering measurements� Remove baseline drift and 1/f noise from spectra� Regulate beam power when scanning Ti:Sapphire laser� Remove power fluctuation in external-cavity diode lasersarising from the feed-forward technique of increasingmode-hop free tuning

� CCD/Display characterizations� Microscopy � Metrology

LPC SeriesThe Laser Power Controller (LPC) offers automatedregulation and control of laser beam power forvirtually any continuous wave (cw) or mode-lockedlaser. It is a patented intensity control system whichuses a high-speed liquid crystal element tomeasure, modulate and stabilise the laser beamdirectly with no connections to the laser head itself.

� Wavelengths from 425 - 780 nm 4W max, 700 - 1100 nm 4W max, 900 - 1700 nm 1W max

� Adjustment of laser beam power over 40:1 range

� Stabilizes laser beam power to 0.03%

� Transmittance of 85%

� Reduction of laser noise from DC to 5 kHz

LASER POWER CONTROLLER

APPLICATION

� Ideal for beam delivery for any experimentutilising free space laser paths.

� High stable variants for alignment criticalapplications.

The mirror mounts are manufactured to exceptionally fine tolerances andprovide a new benchmark for stability and precision.

� Each 170 turns-per-inch (TPI) adjuster has a thread pitch of 0.15 mm andis fitted with knurled head with an additional hexagon socket for easyadjustment by hand or allen key. This ensures a very precise adjustmentof the optical component.

� Constructed from specially treated materials in order to preventmovements due to mechanical stress and changing temperatures.

� There is a choice of thicknesses of the opto-mechanics front and backplates offering value for money and ultimate stability.

� The highly stable front and back plates, together with either 2 or 4powerful springs, ensures exceptional performance and long-termstability of the mounts.

� Available with 2 or 3 adjusters, the 3-adjuster option enabling precisehorizontal positioning of the optic.

The SR050 � Compact small footprint version.

� Excellent for compact setups intight spaces, while ensuringremarkable stability.

The SR100 � Manufactured from special stressfree aluminium, these mounts offerthe highest quality and stability.

� Also available with thicker backplates, and stainless steel M8adjusters.

The SR200 � Mounts designed for large optics. We cansupply mounts for holding optics from 2” to12” diameter.

� Special variants available with the front platenested in the back plate to maximise the clearaperture for an angled beam.

MIRROR MOUNTS

BEAM ANALYSIS

Achieving precise control of your laser beam for your experiment requires knowledge of the laser beamscharacteristics. Parameters such as wavelength, beam profile, position, power, and longitudinal mode structure canhave a big effect on your application.

Whether you need to analyse your beam properties to optimise an experiment or to control quality in a laserproduction environment, Photonics Technologies have a comprehensive range of equipment to help you achieveyour goals.

� The BA7 uses seven individual knife-edges, providing moreaccurate measurement of the true beam shape and dimensions.

� The BA3 uses only three knife-edges and is recommended forsmaller beams measurement as well as for near-Gaussianbeams.

OPTIONS

The Beam Analyzer (BA)provides a bridging technology,producing the 3D intensityreconstruction of CCD (spellout) cameras, while beingcapable of measuring very smallspots at high resolution and huge dynamic range.The measuring technique is based on a multiple scanningknife-edge technology, combined with a tomographic imagereconstruction for the creation of the 2D/3D display.

BEAMANALYZER

� Fiber coupler kit – convenient coupling via FC/APC fiberconnector

� Photo diode exchange kits - visible / NIR / IR range, auto alignedwith built-in focusing lens

� User-specific finesse values

� Scanning option – stand alone scan generator miniScan withintegrated photodiode amplifier

OPTIONS

The Fabry-Perot Interferometer (FPI)100 is a confocal, scanning FPI with abuilt-in photodetector unit, designedfor measuring and controlling themode profiles of cw lasers. Keyfeatures include:

� Convenient mode analysis oflasers

� Eight mirror sets available for wavelengths 330 – 3000 nm

� Free spectral range 1 GHz or 4 GHz

� The standard mirror reflectivity is 99.8 %, corresponding to atypical finesse of > 400, resolving even narrow laser lines

FABRY-PEROT INTERFEROMETER& DETECTOR UNIT

BeamOn HR is a beamdiagnostics measurementsystem for real-timemeasurement of cw orpulsed laser beams. It provides laser beamparameters such as beam width, shape, position, powerand intensity profiles.

It is now available with a software controlled automatedfilter wheel, further widening the optical bandwidthavailable.

BEAMON HR

The miniScan 102 comprises ascan generator, piezo driver anda photodetector amplifier. Theunit has been designed forscanning interferometers andmatches the amplitude andfrequency range of standardpiezo actuators. However it can also be usedindependently for everyday laboratory tasks.

� HV output range 0 – 100 V

� Scan frequency range 100 mHz – 200 Hz

� Transimpedance amplifier with 6-stage gain switch

� Designed for scanning interferometers, e.g. FPI 100

MINISCAN 102

The SPM modelspectrometers andspectroradiometers offer highresolution and versatility,covering 190nm to 2500nm.

� Higher resolution than anyother spectrometers of thesame size on the market due to its proprietary opticaldesign.

� Capability to handle complex signal processing tasksdue to its internal Digital Signal Processing (DSP) chip.

� Powerful software based on Labview which can beeasily integrated into existing software using one of thedevelopment kits.

SPECTROMETERS

SPECTROSCOPIC CELLS

Photonics Technologies offers a range of quality spectroscopy cells available with a wide selection of high purityatomic and molecular fillings and buffer gases.

Gas Cells� Our standard gas cells are Acetylene (Isotope 12 and 13),Hydrogen Cyanide (Isotope 12 and 13), Carbon Monoxide(Isotope 12 and 13), Ethane, Ethylene and Methane.

� All gas used in manufacturing have a purity level of greaterthan 99.9%.

� All cells are tested to ensure purity and correct gas pressure.� Available with a variety of window materials and types, such asflat Pyrex, Wedged and Angled Fused Silica, Brewster AngledFused Silica, and AR-coated Fused Silica windows.

Vapour Cells� Our standard vapour cells are natural Rubidium, RubidiumIsotope 85 or 87, Caesium, Potassium, Sodium, Iodine andWater.

� The purity level of the natural elements used in manufacturingis greater than 98%.

� Before shipping, all vapour cells are tested optically to ensurethe optical quality of the cell’s windows and to detect anyimpurity that may be present in the cell.

� Vapour cells can also be provided with a buffer gas of Helium,Xenon, Argon, Nitrogen or Neon gases, at a pressure of yourspecification.

� Available with a variety of window materials and types, suchas flat Pyrex, Wedged and Angled Fused Silica, BrewsterAngled Fused Silica, and AR-coated Fused Silica windows.

Fiber coupled spectroscopic cells� All vapour and gas cell materials are also available in afiber coupled housing.

� The cell can have either a Single-Mode fiber input andoutput pigtail, or optionally, a photodetector output.

� Also available in a 3-pass design for longer path length ina compact housing.

OPTIONS

PRECISION WAVELENGTHREFERENCE SPECTROSCOPIC CELLS

APPLICATION

� In addition to our standard fill vapours or gases, we haveexperience manufacturing several different cell fill materials:Krypton, Ammonia, Neon, Carbon Dioxide, Helium, Bromine,Tellurium Isotope 138, Mercury and Argon.

� We can provide the exact cell to suit your wavelengthreference cell requirement.

� The Herriott cells are suitable for applications whichrequire a long interaction path length between anelectromagnetic wave and a gaseous sample, e.g. formonitoring tasks in industrial environments and also forinfrared absorption spectroscopy in scientific research.

The CMP-30 multipass cell is a Herriott absorption cell witha total optical path length of 30m and is ideally suited forinfrared absorption spectroscopy in research and formonitoring tasks in industrial environments.

Standard versionAn incoming beam undergoes multiple reflections betweentwo mirrors describing two circles of spots on each mirrorbefore exiting through the 4mm diameter CaF2 entrance /exit window. Making a total of 74 passes through the cellprovided a total interaction length of 30m in a compact cell. � The input and output beams travel on different planes. Thisensures clear separation between the input and outputbeams, permitting accurate absorption measurementseven in the case of misalignment or incorrect focusing.

� The cell is resistant to most common chemicals. Thematerials in contact with the gas are Pyrex and BK7 glass,stainless steel, CaF2, Gold, Viton, and Teflon.

� The cell can be operated at pressures from 10-3 Torr up to1 atm. Gas inlet and outlet ports at either end of the cellallow for examination of flowing gases. Alternatively, thePyrex tube can be removed in-situ without dismantling thecell, when 'room air' measurements are to be performed.

High pressure version� The high pressure model is designed for operation at highpressures up to 5 atm.

HERRIOTT CELLS

PHOTONICSTECHNOLOGIES

SPECTROSCOPICESSENTIALS

FOR YOURSPECTROSCOPY SOLUTIONS

BUY ONLINE ATwww.photonicstechnologies.com

CALL US ON +44 (0)1483 799030

OR EMAIL US ATsales@photonicstechnologies.com

Photonics Technologies LtdUnit SU4B Lansbury Estate102 Lower Guildford Road

Woking GU21 2EP, United KingdomTel: +44 (0)1483 799030Fax: +44 (0)1483 799076

www.photonicstechnologies.com