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TopMode

Powerful and Coherent Diode Lasers

  • Diode laser with best wavelength / coherence stability
  • Wavelengths: 405 nm (other wavelengths on request)
  • 100 mW single-frequency power @ 405 nm
  • Includes active coherence stabilization (CHARM)
  • For metrology, interferometry, Raman spectroscopy

TOPTICA’s TopMode lasers operate as easily as a HeNe, but also offer higher power and blue wavelengths. The TopMode series sets records in terms of power, coherence and wavelength stability. The proprietary CoHerence-Advanced Regulation Method (CHARM) provides an active stabilization of the lasers’ coherence and ensures continuous single-frequency operation. TopMode and CHARM means nothing less than reliable 24/7 operation.

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  • Specification

    Model TopMode 405
    Operation cw, single (fixed) frequency
    Wavelength 405 nm
    Wavelength tolerance ± 2 nm
    Wavelength selection upon request, accuracy +/- 0.25 nm
    Wavelength tuning No
    Wavelength stability* < 1 pm/h (< 0.5 pm/h typ.), peak-peak
    Linewidth < 5 MHz (< 0.01 pm)
    Coherence length > 25 m
    ASE suppression 40 dB typ.
    Output power, free-space 50 mW, (100 mW**)
    Output power, fiber-coupled 25 mW, (50 mW**)

    CHARM Active coherence stabilization, included
    Power stability * Typ. < 0.5% (STD/mean) / h
    Intensity noise (RMS) ≤ 0.1% @ 10 Hz - 10 MHz
    Polarization Linear, > 100 : 1, 90° (free-space version)
    Beam shape Collimated, circular, typ. diameter 1 mm (FWHM), 1.7 mm (1/e²), ellipticity < 10% ***
    Spatial mode M² < 1.5 (< 1.2 typ.)
    Optical isolation Built-in, > 30 dB
    Fiber coupling Optional, typ. 50% in SM fiber
    Electronics TopMode CHARM Control
    Warm-up time < 10 min from standby
    Dimensions laser head (H x W x D) Free-beam: 192 x 80 x 60 mm, fiber-coupled: 218 x 80 x 60 mm
    Weight laser head 1.5 kg
    Dimensions control unit (H x W x D) 45 mm x 480 mm x 290 mm
    Weight control unit 4 kg
    Power supply 100 .. 120 V / 220 .. 240 V AC, 50 .. 60 Hz (auto detect)
    Power consumption typ. < 70 W, max. 150 W (incl. CHARM control)
    PC Interface Ethernet, USB
    Environment temperature 15 - 30 °C, stability ± 3 °C (operating), 0 - 40 °C (storage and transport)
    Environment humidity Non-condensing

    * With CHARM activated
    ** Optional high-power version
    *** In the far field, i.e. 2 m after the source.

  • Additional Information
    TOPTICA AG - 380-hr-long-term-test of TopMode-405 with CHARM activated. The top trace shows the ambient conditions. The lower three traces depict laser power, wavelength and fringe visibility contrast, respectively. The laser remains highly coherent, without any mode-hops or multi-mode emission intervals. 380-hr-long-term-test of TopMode-405 with CHARM activated. The top trace shows the ambient conditions. The lower three traces depict laser power, wavelength and fringe visibility contrast, respectively. The laser remains highly coherent, without any mode-hops or multi-mode emission intervals.
  • Options

    Fiber coupling - SmartDock
    The SmartDock works with both single-mode and polarization-maintaining fibers. The coupling efficiency is >50%. Both single-mode and polarization-maintaining fibers can be connected to the SmartDock.

    • Highest single-mode coupling efficiency
    • Exceptional stability, even under varying ambient conditions
    • Patented flexure hinge design (US 7,321,706, EP 1,666,944).
    • Simple, straight-forward alignment
  • Applications
    • Precision metrology
    • Scatterometry
    • Interferometry and holography
    • High resolution Raman spectroscopy
    • Quantum cryptography
    • Photonic down-conversion
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