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.
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)