



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
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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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**) -
Additional Information
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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
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Applications
- Raman spectroscopy
- Digital holography
- Precision metrology
- Scatterometry
- Interferometry and holography
- High resolution Raman spectroscopy
- Quantum cryptography
- Photonic down-conversion
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Downloads
- Product Brochure: TopMode
- Technical Drawings: TopMode
- Technical Drawings: TopMode with SmartDock fiber coupler
- Flyer: TopMode Raman Spectroscopy
- Flyer: TopMode Digital Holography
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Literature
- Article: Ulrich Eismann Direct and frequency-converted diode lasers provide all wavelengths for holography, Laser Focus World (2018)