TopMode

Powerful and Coherent Diode Lasers – from 375 nm to 515 nm

  • Diode laser with best wavelength / coherence stability
  • Includes active coherence stabilization (CHARM)
  • Up to 100 mW single-frequency power
  • For Raman spectroscopy, Digital holography, metrology interferometry

Top seller: 405 nm

  • 100 mW single-frequency power @ 405 nm
  • Ideal for metrology, interferometry, Raman spectroscopy

Other wavelength from 375 nm to 515 nm

  • Up to 100 mW, depending on the wavelength
  • Pick your wavelength

Easy OEM Integration

  • Compact, space-saving
  • Passive air cooling: No vibrations
  • Flexible control via the CHARM controller (push-button), computer GUI or direct ASCII commands

TOPTICA’s TopMode lasers operate as easily as a HeNe, but also offer higher power and the choice of wavelength. 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.

 

Application in focus:

Raman spectroscopy

The short wavelengths provided by our TopMode lasers are particularly well-suited to Raman spectroscopy of inorganic materials, for which no fluorescence obscures the Raman signal. Raman intensity depends on the excitation wavelength by a factor 1/λ4 . TopMode lasers allow strong Raman signals that remain detectable by Si-based detectors.

TopMode lasers provide:

  • Up to 100 mW at 405 nm, for a strong Raman signal
  • Single frequency narrow Linewidth (< 5 MHz), for high-resolution measurements
  • Stable operation with spectral purity, for repeatable, quantitative measurements

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Application in focus:

Digital holography

In digital holography, an interference pattern is recorded using several, carefully selected wavelengths, in order to measure/calculate the topology of a surface. The separation between laser wavelengths, e.g. λ1 and λ2, provides a “Synthetic wavelength” defined by ∧ = λ1⋅λ2 / | λ1-λ2 |, which determines the maximum height that can be measured.

TopMode lasers provide:

  • Precise wavelength selection between 375 nm and 515 nm
  • Up to 100 mW, depending on the wavelength
  • Single frequency narrow Linewidth (< 5 MHz) for high resolution measurements
  • Stable operation
  • Laser sets with very similar specifications

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