Cobra-Stretch...Cobra-Stretch Specifications 1. At 625 nm (peak DCM) pumped at 532 nm 2. At 570 nm...

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Cobra-Stretch AMPLIFIED PULSED DYE LASERS The Cobra-Stretch from Spectra-Physics is an amplified pulsed dye laser system, German engineered by our partner firm Sirah GmbH for precision, stability and reliability. Features include integrated oscillator / pre-amplifier, quick change dye cuvettes, optional amplifier or Frequency Conversion Unit (FCU). The Cobra-Stretch systems optional amplifiers can be upgraded to the enhanced beam, high pump energy EBP cells. External wavelength conversion units extend the tuning range from the deep UV to the near IR. The Cobra-Stretch meets output energy needs up to 250 mJ. Based on a two stage design, the Cobra-Stretch can accommodate an extra amplifier stage to obtain higher energies or a frequency conversion unit to extend the range of attainable wavelengths, either of which is conveniently housed inside the main laser cabinet. The Cobra-Stretch dye laser incorporates a grazing incidence resonator designed to utilize the grating’s dispersion twice per oscillator round-trip, ensuring narrow linewidths with low ASE. An optional second grating can be added to the resonator for ultra narrow linewidths below 0.03 cm -1 at 570 nm. The Cobra-Stretch resonator allows narrow line tuning over a broad tuning range without the need for an intra-cavity etalon, thus simplifying the measurement process without sacrificing performance. The Cobra-Stretch laser’s quartz dye cuvettes are held in place by state-of-the-art cell mounts manufactured for stability and precision from high performance alloys and graphite- reinforced polymers. Designed for extreme ease of use, the mounted cuvettes and the entire dye circulator unit can be removed in seconds without tools and without interrupting the dye flow loop. This design is ideal for applications that require more than one type of dye. The quick change from one dye defined wavelength range to another saves time and eliminates the need for messy dye changes. Dye flow rates for the standard circulator and cell assemblies are high enough to work up to 50 Hz with higher power pumps available for higher repetition rates. For additional versatility, the Cobra-Stretch system’s circulators operate with polar and non-polar solvents, as well as solvents of varying viscosities. Reliability is inherent in the Cobra-Stretch laser design. All oscillator components are mounted on a solid block of low thermal expansion stainless steel, mechanically and thermally isolated from the outer laser housing. By removing virtually all mechanical and thermal stress from the oscillator block and by using opto-mechanics optimized for easy and reproducible operation, the oscillator stage requires very limited user adjustment. This mechanical stability results in a wavelength resettability for the oscillators of <5 pm, a limit set primarily by the Cobra-Stretch laser’s spectral resolution. The Cobra-Stretch Advantage • Wide wavelength coverage from 190 nm to >11 μm • Spectral linewidths <0.03 cm -1 with no intra-cavity etalon • User friendly software fully LabView enabled • High output energy, >180 mJ with Quanta-Ray ® Nd:YAG at 650 mJ per pulse • High quality beam profile with capillary cell option APPLICATIONS • Laser induced fluorescence • Lidar and remote sensing • Combustion and atmospheric studies • Laser spectroscopy • Cavity ringdown spectroscopy • CARS • Photolysis

Transcript of Cobra-Stretch...Cobra-Stretch Specifications 1. At 625 nm (peak DCM) pumped at 532 nm 2. At 570 nm...

  • Cobra-StretchA M P L I F I E D P U L S E D D Y E L A S E R S

    The Cobra-Stretch from Spectra-Physics is an amplified pulsed dye laser system, Germanengineered by our partner firm Sirah GmbH for precision, stability and reliability. Featuresinclude integrated oscillator / pre-amplifier, quick change dye cuvettes, optional amplifier orFrequency Conversion Unit (FCU). The Cobra-Stretch systems optional amplifiers can beupgraded to the enhanced beam, high pump energy EBP cells. External wavelengthconversion units extend the tuning range from the deep UV to the near IR.

    The Cobra-Stretch meets output energy needs up to 250 mJ. Based on a two stage design,the Cobra-Stretch can accommodate an extra amplifier stage to obtain higher energies or afrequency conversion unit to extend the range of attainable wavelengths, either of which isconveniently housed inside the main laser cabinet.

    The Cobra-Stretch dye laser incorporates a grazing incidence resonator designed to utilizethe grating’s dispersion twice per oscillator round-trip, ensuring narrow linewidths with lowASE. An optional second grating can be added to the resonator for ultra narrow linewidthsbelow 0.03 cm-1 at 570 nm. The Cobra-Stretch resonator allows narrow line tuning over abroad tuning range without the need for an intra-cavity etalon, thus simplifying themeasurement process without sacrificing performance.

    The Cobra-Stretch laser’s quartz dye cuvettes are held in place by state-of-the-art cellmounts manufactured for stability and precision from high performance alloys and graphite-reinforced polymers. Designed for extreme ease of use, the mounted cuvettes and the entiredye circulator unit can be removed in seconds without tools and without interrupting thedye flow loop. This design is ideal for applications that require more than one type of dye.The quick change from one dye defined wavelength range to another saves time andeliminates the need for messy dye changes.

    Dye flow rates for the standard circulator and cell assemblies are high enough to work up to50 Hz with higher power pumps available for higher repetition rates. For additionalversatility, the Cobra-Stretch system’s circulators operate with polar and non-polar solvents,as well as solvents of varying viscosities.

    Reliability is inherent in the Cobra-Stretch laser design. All oscillator components aremounted on a solid block of low thermal expansion stainless steel, mechanically andthermally isolated from the outer laser housing. By removing virtually all mechanical andthermal stress from the oscillator block and by using opto-mechanics optimized for easy andreproducible operation, the oscillator stage requires very limited user adjustment. Thismechanical stability results in a wavelength resettability for the oscillators of 11 µm

    • Spectral linewidths 180 mJ with Quanta-Ray® Nd:YAG at650 mJ per pulse

    • High quality beam profile with capillary cell option

    A P P L I C A T I O N S

    • Laser induced fluorescence

    • Lidar and remote sensing

    • Combustion and atmospheric studies

    • Laser spectroscopy

    • Cavity ringdown spectroscopy

    • CARS

    • Photolysis

  • Cobra-Stretch Optical Layout

    Mirror(Delay)

    Mirror(Delay)

    Beam Expansion

    Dye Output

    TuningMirror

    OutputCoupler

    BeamSplitterPump

    Beam

    BeamReversion

    CylindricalLenses

    Beamsplitter(Pre-amp)

    Grating

    Telescope

    Prism

    CylindricalLenses

    40 mm Dye Cell20 mm Dye Cell

    Cobra-Stretch Dimensions

    Side View

    7.8

    ..9.

    1(1

    97..

    230)

    154

    3718

    (457)

    13.2(334)

    6.3(160)

    8.2

    ..9.

    5(2

    07..

    240)

    polarization

    19.5(494)

    12.3

    ..13

    .6(3

    12..

    345)

    Pump Laser Input End

    6.1(154)

    1.5(37)

    Dye Laser Output End

    Dimensions in inches (mm)

    37.3(947)

    35(877)

    1.4(35)

    Cobra-Stretch

  • Cobra-Stretch Specifications

    1. At 625 nm (peak DCM) pumped at 532 nm2. At 570 nm (peak Rhodamine 6G) pumped at 532 nm3. Exact linewidth depends weakly on wavelength; value given for 450 nm4. 1800 lines per mm Woods Anomally occurs at 560–571 nm and 2400 lines per mm Woods Anomally occurs at 423–434 nm

    Prism Model Linewidth Specifications

    Model Groove Density Grating Length Tuning Range Linewidth EfficiencyCobra-Stretch-P – – 370–900 nm 150 pm 5 cm-1(1) 20%1

    Grating Models Linewidth Specifications

    Model Groove Density Grating Length Tuning Range Linewidth

    EfficiencyWith

    Amplifier

    EfficiencyWithout

    AmplifierCobra-Stretch-G 1800 lines/mm4 60 mm 400–900 nm 3.6 pm 0.10 cm-1(1) 10%1 28%1

    2400 lines/mm4 60 mm 350–740 nm 2.7 pm 0.08 cm-1(2) 9%2 27%2

    3000 lines/mm 60 mm 350–610 nm 2.0 pm 0.06 cm-1(2) 9%2 26%2

    Cobra-Stretch-LG 1800 lines/mm4 90 mm 400–900 nm 2.4 pm 0.06 cm-1(1) 10%1 28%1

    2400 lines/mm4 90 mm 350–740 nm 1.8 pm 0.06 cm-1(2) 9%2 27%2

    3000 lines/mm 90 mm 350–610 nm 1.4 pm 0.05 cm-1(2) 9%2 26%2

    Cobra-Stretch-D 1800 lines/mm4 2 x 90 mm 410–900 nm 1.7 pm3 0.05 cm-1(1) 8%1 25%1

    2400 lines/mm4 2 x 90 mm 350–710 nm 1.2 pm3 0.04 cm-1(2) 8%2 25%2

    3000 lines/mm 2 x 90 mm 350–580 nm 1.0 pm3 0.03 cm-1(2) 8%2 25%2

    Wavelength and Beam CharacteristicsAbsolute Wavelength Accuracy

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    355 nm-pumped Dye Tuning Curves

    Cobra-Stretch


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