1000mm focal length monochromator / spectrometer, McPherson Model 2061

Model 2061 Czerny-Turner Monochromator Higher Resolution and Throughput

The 1-meter focal length Model 2061 provides the traditional blend of throughput and spectral resolution. These instruments are staples of laboratory and experimental spectroscopy. We offer this unit with an f/7 aperture ratio in two versions. The most popular uses spherical optics. An "A" version is also available. It uses hand polished master off-axis parabolic optics to best image small entrance images. Used in air the spectral range of these instruments extends from 185-nm to 78-µm, and with vacuum down to 105-nm (depends on the grating.) For intermediate ranges a purge gas can be used (Nitrogen, for example.) McPherson SNAP IN gratings allow the alignment-free use of many different gratings. Easily view a wider spectral range or obtain higher resolution!

Model 2061 PDF Data Sheet

Specifications & Additional Information:

Optical DesignMcPherson Model 2061 1-meter focal length f/7 Monochromator
Focal Length1-meter, Czerny Turner design Spectrometer with Patented "Snap-In" gratings
Aperture Ratio7 (8.6 with smaller grating)
Wavelength Rangerefer to grating of interest for range, in extended position increase top limit 20%
Wavelength Accuracy+/-0.05 nm (with 1200 G/mm grating)
Wavelength Reproducibility+/- 0.005 nm (with 1200 G/mm grating)
Grating Size120 x 140-mm (or 110 x 110-mm) - Echelle gratings up to 220-mm wide
Slit LocationsAxial and lateral with optional extra entrance and exit port selection mirrors
Focal Plane50-mm maximum width, multiply dispersion by the width of your detector for range

Performance with various diffraction gratings:

Grating (G/mm) (others available) 2400 1800 1200 600 300 150 75 20
Wavelength Range from 185-nm to 650nm 860nm 1.3um 2.6um 5.2um 10.4um 20.8um 78um
Resolution (nm) at 313.1-nm 0.009 0.012 0.018 0.036 0.07 0.14 0.28 1.05
Dispersion (nm/mm) 0.42 0.55 0.83 1.6 3.2 6.4 12.8 48
First Order Littrow Blaze (nm) 240nmHolo250nm300nm750nm 1.25um2.0um45um
300nm300nm500nm1.0um 2.5um3.0um
Holo500nm750nm3.0um 4.0um8.0um
750nm1.0um4.0um 6.0um10.0um
1.0um1.85um 8.0um12.0um

Outline Drawing

McPherson Model 2061

Select Publications

Abstract: We have implemented a new Raman fiber-optic probe design based on a hollow-core photonic-crystal excitation fiber surrounded by silica-core collection fibers. The photonic-crystal fiber offers low attenuation at the pump radiation wavelength, mechanical flexibility, high radiation stability, and low background noise. Because the excitation beam is transmitted through air inside the hollow-core fiber, silica Raman scattering is much reduced, improving the quality of the spectra obtained using probes of this design. Preliminary results show that the new probe design decreases the Raman background from the silica by approximately an order of magnitude compared to solid-core silica Raman probes.
Stanislav O. Konorov, Christopher J. Addison, H. Georg Schulze, Robin F. B. Turner, and Michael W. Blades
Abstract: Abel-inverted excitation temperatures are measured for Ar-N2 inductively coupled plasmas (ICPs) formed in a conventional torch using a 27.12-MHz crystal-controlled generator. The dependence of temperature on gas composition (0–100% N2 in the outer flow), forward power (1.2–3.0 kW), observation height (6 and 15 mm) and injector gas flow-rate (1 and 2 l min–1) are studied using Fe as the thermometric species. When 5–10% N2 is used in the outer gas flow instead of pure Ar, the axial temperature is approximately 1000 K greater than that of the commonly used Ar ICP. Substitution of Ar in the outer flow by pure N2 reduces the axial temperature from 6200 to 4900 K at 1.2-kW forward power. At 2.5 kW, the Ar-N2 plasma, with pure N2 in the outer flow, exhibits a temperature of approximately 6200 K, similar to that of a 1.2-kW Ar ICP
Izumi Ishii, D. W. Golightly and Akbar Montaser
Abstract: Capillary electrophoresis (CE) interfaced with low-temperature (4.2 K) fluorescence line-narrowing (FLN) spectroscopy is used for separation and structural characterization of polycyclic aromatic hydrocarbon-derived DNA adducts. The CE-FLN system is applied to the separation and identification of mixtures of benzo[a]pyrene and dibenzo[a,l]pyrene DNA adducts. Interfacing CE with FLN spectroscopy allows on-line separation and high-resolution spectroscopic identification of CE-separated DNA adducts, providing a new powerful tool for DNA adduct structure characterization
R. Jankowiak, D. Zamzow, and G. J. Small
Abstract: Temperature dependence of the excitonic and biexcitonic emissions in cubic ZnS single crystals has been studied by photoluminescence technique. We observed the very well-resolved excitonic and biexcitonic emissions from cubic ZnS single crystals with very low excitation density, in the tens-of-milliwatts-per-square-centimetre range. The kinetic energy contribution to the shift with temperature of the biexcitonic emission was determined showing a characteristic difference with the normal shift caused by the temperature-narrowed band gap.
N.Q Liem, V.X Quang, D.X Thanh, J.I Lee, D Kim
Abstract: A passive ion temperature polychromator has been deployed on Pegasus to study power balance and non-thermal ion distributions that arise during point source helicity injection. Spectra are recorded from a 1 m F/8.6 Czerny-Turner polychromator whose output is recorded by an intensified high-speed camera. The use of high orders allows for a dispersion of 0.02 Å/mm in 4th order and a bandpass of 0.14 Å (∼13 km/s) at 3131 Å in 4th order with 100 μm entrance slit. The instrument temperature of the spectrometer is 15 eV. Light from the output of an image intensifier in the spectrometer focal plane is coupled to a high-speed CMOS camera. The system can accommodate up to 20 spatial points recorded at 0.5 ms time resolution. During helicity injection, stochastic magnetic fields keep Te low (∼100 eV) and thus low ionization impurities penetrate to the core. Under these conditions, high core ion temperatures are measured (Ti ≈ 1.2 keV, Te ≈ 0.1 keV) using spectral lines from carbon III, nitrogen III, and boron IV
M. G. Burke, R. J. Fonck, M. W. Bongard, D. J. Schlossberg and G. R. Winz
Abstract: A reflective optical transport system has been designed for the OMEGA Thomson-scattering diagnostic. A Schwarzschild objective that uses two concentric spherical mirrors coupled to a Pfund objective provides diffraction-limited imaging across all reflected wavelengths. This enables the operator to perform Thomson-scattering measurements of ultraviolet (0.263 μm) light scattered from electron plasma waves
Katz J, Boni R, Sorce C, Follett R, Shoup MJ 3rd, Froula DH
Abstract: Fully dynamic Stark effect visible spectroscopy was used for the first time to directly measure the local rf electric field in the boundary plasma near a high-power antenna in high-performance, magnetically confined, fusion energy experiment. The measurement was performed in the superconducting tokamak Tore Supra, in the near field of a 1–3 MW, lower-hybrid, 3.7 GHz wave-launch antenna, and combined with modeling of neutral atom transport to estimate the local rf electric field amplitude (as low as 1–2  kV/cm) and direction in this region. The measurement was then shown to be consistent with the predicted values from a 2D full-wave propagation model. Notably the measurement confirmed that the electric field direction deviates substantially from the direction in which it is launched by the waveguides as it penetrates only a few cm radially inward into the plasma from the waveguides, consistent with the model
C. C. Klepper, R. C. Isler, J. Hillairet, E. H. Martin, L. Colas, A. Ekedahl, M. Goniche, J. H. Harris, D. L. Hillis, S. Panayotis, B. Pegourié, Ph. Lotte, G. Colledani, V. Martin, and Tore Supra Lower Hybrid Systems Technical Team
Abstract: Balmer-series spectral line profiles of deuterium emission near a lower-hybrid (3.7 GHz) wave, high power (1–4 MW) launcher were measured with high-spectral resolution in the Tore Supra tokamak and fitted to an atomic physics model which includes both Zeeman and dynamic Stark effects. The magnetic field is static and the electric field is assumed to be monochromatic at 3.7 GHz. The determined strength and direction of the high-frequency electric field is found to be in good agreement with the results of a simulation that computes the propagation of these lower hybrid waves into the plasma in the region around the launch antenna and specifically in the region of estimated peak emission contributing to the measurement. This agreement indicates feasibility for the use of dynamic Stark effect spectroscopy to study interaction at the plasma antenna interactions in a fusion plasma environment
C.C. Klepper, D.L. Hillis, R.C. Isler, J. Hillairet, E.H. Martin, L. Colas, A. Ekedahl, M. Goniche, Ph. Lotte, G. Colledani, V. Martin, S. Panayotis, B. Pegourié, J.H. Harris
Abstract: A multi-channel high resolution spectrometer was developed for the measurement of the edge plasma rotation on J-TEXT tokamak. With the design of two opposite viewing directions, the poloidal and toroidal rotations can be measured simultaneously, and velocity accuracy is up to 1 km/s. The photon flux was enhanced by utilizing combined optical fiber. With this design, the time resolution reaches 3 ms. An assistant software “Spectra Assist” was developed for implementing the spectrometer control and data analysis automatically. A multi-channel monochromatic analyzer is designed to get the location of chosen ions simultaneously through the inversion analysis. Some preliminary experimental results about influence of plasma density, different magnetohydrodynamics behaviors, and applying of biased electrode are presented
Z. F. Cheng, J. Luo, Z. J. Wang, Z. P. Zhang, X. L. Zhang, S. Y. Hou, C. Cheng and G. Zhuang
Abstract: We report the production of efficient, wideband white light with a spectrum ranging from 400 to 900 nm obtained by using nominally un-doped Y2O3 nanopowders when excited with the 803.5 nm emission of a laser diode. The powders synthesized by using thermal decomposition technique were estimated to be 20 nm in size by using XRD patterns and confirmed of this size by using SEM images. The color temperature of the obtained white light was determined as 2756 K with a high color rendering index of 99.
Gökhan Bilir, Baldassare Di Bartolo
Abstract: We describe a new visible spectroscopy diagnostic system for measuring plasma properties in the PBFA II applied-B ion diode. The system transports light from the ion diode to a remote screen room where it is recorded by a spectrography coupled to a streak camera. We developed extensive calibration techniques for measuring the collection efficiency into the fiber link, the effects of the background bremsstrahlung radiation on the fibers, the fiber transmission as a function of wavelength, and the absolute streaked-spectrograph sensitivity as a function of wavelength. We have recorded time-dependent spectral line profiles and intensities from the PBFA II plasma opening switch, the beam-transport gas cell, and the anode plasma. The Stark shift of the LiI 2s-2p transition observed on LiF-anode shots shows that the time-resolved electric field peaks at 7--8 MV/cm, the highest field ever measured using the Stark effect. The potential of these measurements to expand our knowledge of ion-diode physics is being explored.
J. Bailey, A.L. Carlson, R.L. Morrison, Y. Maron

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