Type of laser: «Adaptable» diode laser or solid-state laser, fibered or not, with a selectable wavelength of 532 nm, 664 nm, or 945 nm.

Laser power: Must be sufficient to excite molecular vibrations without damaging the sample. Typically between 10 mW and 500 mW.

Stability and spectral purity: Good wavelength stability and a narrow linewidth are crucial.

Objective: Use high-quality microscopic objectives (10x, 20x) to focus the laser beam on the sample in most DACs and environments.

Collimators: To maintain a well-aligned and focused beam.

Notch or edge filters: To block the laser light and allow the passage of the scattered Raman light.

This part is not covered by BETSA®; we only provide the BROT, which will adapt to the client’s choice of spectrometer and detector.

Spectrometer: With sufficient resolution to distinguish Raman bands. Should include an adjustable entrance slit and a high-quality diffraction grating.

Detector: Cooled CCD to reduce thermal noise and increase sensitivity. EMCCD detectors can be used for applications requiring high sensitivity.

Sample holders: Stable and adaptable for different types of samples (solids, liquids, gases).

Microscope: To align and observe the sample, often integrated with the Raman optical head for increased precision. At least 4 XY stages (precision <5µm) for aligning the camera, optical fiber output, light input for internal illumination, and the incoming laser beam coupled with a tilt mechanism.

Control: Software for laser control, interfacing, and operation.

Data acquisition: Manufacturer’s software for the spectrometer for data collection and spectral analysis.

Synchronization electronics: To coordinate the operation of the laser, spectrometer, and detector.

Cooling: Cooling systems for sensitive electronic components.

Safety enclosure: To protect the user from laser radiation.

Vibration isolation: To reduce mechanical noise.

Reference standards: Materials with well-known Raman spectra to validate the device’s performance.