Handheld / Benchtop Raman Spectrometer | SIMTRUM

OEM Raman Spectrometer System

• Wavelength choice  785nm & 1064nm 

• Output power: 0-500mW tunable

• Wavelength range: 200-3200cm^-1 / 200-2500cm^-1

• Optical resolution: 6 - 12 cm^-1

• SDK available for system integration

• Ultra-stable on Thermal Drifting 

OEM Raman provides an option for customers to integrate our Raman system into a system, we provide SDK, API for software integration, we can customize the laser and spectrum resolution based on customer request

Customized option available 

  • Working distance 

  • Focus spot size 

  • Optical resolution 

  • Laser source, mode , power, linewidth

Portable Tabletop Raman System - RMT EZ

• Wavelength choice 785nm 

• Output power range 0-500mW

• Wavelength range: 200-3200cm^-1 

• Optical resolution: 7 cm^-1  typical

• System size: 150 x 150 x 360 mm

RMT EZ provides a sample holder in front of the laser output port, custom can put liquid sample inside or Raman analysis, if you want to measure the solid sample, the sample holder can be disassembled so you can place the sample in front of the detection port for Raman analysis

• Rigid Integrated optical design 

• Customized Sample hold available 

• Analysis software available 

• Ultra-stable on Thermal Drifting 

Portable Tabletop Raman System - RMT

• Wavelength choice 532nm, 785nm & 1064nm 

• Output power range 0-500mW

• Wavelength range: 200-3200cm^-1 /200-1800cm^-1

• Optical resolution: 8 - 9 cm^-1 typical

• System size: 373.5 x 260 x 74 mm

RMT785 is a fibre output Raman spectrometer, it provides customers the flexibility to measure the sample in any direction it also works well with the customer’s sample fixture, the standard fiber length is 0.5 meter, 1 meter fibre can be provided upon request

• Rigid Integrated optical design 

• Customized Sample hold available 

• Analysis software available 

• Ultra-stable on Thermal Drifting 

• External fiber optic probe for more flexibility in use

Wide Field Raman Microscope,  

- Raman spectral mapping:

- Photoluminescence micro-spectroscopy

- Multi-channel design

- Using referenced scan image to get localized spectrum

- Standard laser wavelengths offered include 532, 785, and 1064nm, with more available upon request.

- Option for Bright Field or Dark Field microscope

- Standard Free space setup, option for external fiber port.

Details specification for the system please 

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6mm, positioning

 accuracy 10um

6mm, positioning 

accuracy 10um

6mm, positioning 

accuracy 10um

6mm, positioning 

accuracy 10um

The difference between Rayleigh Scattering, Stoke Raman Scatting  & Anti-Stoke Raman scattering

A Raman spectrometer is an analytical instrument used to measure the Raman scattering of light from a sample. 

The basic principle of Raman spectroscopy involves shining a monochromatic light, typically from a laser, onto a sample. The majority of the incident photons undergo elastic scattering known as Rayleigh scattering, while a small fraction (around 1 in 10^6) interacts with the sample's molecules and undergoes inelastic scattering known as Raman scattering, resulting in a shift in energy. This shift provides valuable information about the vibrational, rotational, and other low-frequency modes of the molecules within the sample.

In traditional Raman scattering, the majority of scattered photons undergo a lower energy (longer wavelength) shift compared to the incident photons. This is known as Stokes Raman scattering. 

In anti-Stokes Raman scattering, a small fraction of scattered photons gain energy during the scattering process, resulting in the scattered light has higher energy (shorter wavelength) than the incident light. 

In Stokes Raman scattering, the scattered photons typically have lower energy than the incident photons. This energy shift corresponds to the energy difference between the initial and final states of the molecular vibrations involved in the scattering process. The difference in energy manifests as a shift towards longer wavelengths (lower frequency) in the Raman spectrum.

Stokes Raman scattering is more likely to occur compared to anti-Stokes Raman scattering because it involves the transfer of energy from the incident light to the molecular vibrations. This energy transfer is governed by the energy level transitions in the sample.

Stokes Raman scattering is extensively used in various fields, including chemistry, materials science, pharmaceuticals, and biology, for analyzing and studying molecular properties, monitoring chemical reactions, and identifying unknown substances.

The energy shift in anti-Stokes Raman scattering occurs because the sample absorbs some of the energy from the incident photon, promoting molecular vibrations to higher energy levels. The scattered photon that is emitted as a result of this process has higher energy compared to the incident photon.

Anti-Stokes Raman scattering is less likely to occur compared to Stokes Raman scattering because it requires energy to be transferred from the surroundings or from the sample itself to the vibrational modes of the molecules. This energy transfer is often less probable due to thermal energy considerations.

The intensity of the anti-Stokes Raman scattering is typically weaker than that of Stokes Raman scattering because the probability of energy transfer in the opposite direction is lower. As a result, anti-Stokes Raman scattering is generally less utilized in Raman spectroscopy. However, it can still provide valuable information, particularly in cases where high-energy transitions or thermal effects are of interest.

What is Raman shift and why it is useful?

The Raman shift is the energy difference between the incident photons and the scattered photons. It is typically expressed in units of wavenumbers   (cm^-1).

It is a crucial parameter about the molecular vibrations and energy levels in the sample. It reflects the specific vibrational modes that are excited or deactivated during the scattering process, revealing details about the molecular structure, chemical bonding, and composition of the sample.

The Raman shift is calculated as the difference in wavenumbers (cm^-1) between the scattered light and the incident light in Raman spectroscopy. The wavenumber is the reciprocal of the wavelength and is often used to describe the energy or frequency of light.

How to calculate the Raman shift?

1. Determine the wavelength of the incident light.

2. Measure the wavelength of the scattered light: After interacting with the sample, the scattered light is collected, and its wavelength is measured. 

3. Calculate the wavenumber for both the incident and scattered light:   ν= 1 / λ  

4. Calculate the Raman shift: The Raman shift (Δν) is determined by subtracting the wavenumber of the incident light from the wavenumber of the scattered light: Δν = ν_s - ν_i

The resulting value is the Raman shift, indicating the energy difference between the scattered and incident light.

It's important to note that the Raman shift can be positive or negative, depending on whether the scattered light has a higher or lower energy (shorter or longer wavelength) than the incident light, respectively.

By analyzing the Raman shift, scientists can identify the presence of specific functional groups, distinguish between different molecular species, detect impurities or contaminants, and monitor chemical reactions or phase changes. 

What are the key components for a Raman spectrometer system?

1. Light Source: A laser is commonly used as the light source in Raman spectroscopy. Common wavelength choice is 532nm, 785nm and 1064nm.

2. Optical System: T includes lenses, mirrors, and filters that manipulate the laser beam and direct it onto the sample. They also collect and focus the scattered light for detection.

3. Diffraction Grating or a Prism: used to separate the scattered light into its different wavelengths (or frequencies). This allows for the creation of a Raman spectrum, where each wavelength corresponds to a specific vibrational mode of the sample.

4. Detector: The detector captures the dispersed light and converts it into an electrical signal that can be processed and analyzed. Common detectors used in Raman spectrometers include charge-coupled devices (CCDs) and photomultiplier tubes (PMTs). 

5. Spectrometer: a standard spectrometer can be used to replace item 2, 3 and 4.  It is more robust and easy to use. 

Other Key components can be used to upgrade your Raman spectroscopy. 

6. Raman Microsocpe: Raman spectrometer + microscope + motorized xy stage

7. Confocal Raman Microscope: Raman spectrometer + Confocal system 

8. Low-Temperature Raman System: Raman spectrometer + Cryostage. 

What are the applications of Raman spectroscopy:

1. Material Analysis and Identification

2. Pharmaceutical Analysis

3. Biological and Biomedical Research

4. Forensic Science

5. Environmental Monitoring

6. Materials Science and Nanotechnology

7. Art and Cultural Heritage

8. Geochemical Analysis

9. Energy and Solar Cells

10. Process Monitoring and Control

High Resolution Spectrometer

High Resolution Spectrometer

Back Illuminated Spectrometer

Hi Sensitivity Cooled Spectrometer 

Handheld Raman System 

Band Range 

200-3200cm^-1/ 200-2500cm^-1

Portable Tabletop Raman System

Portable Tabletop Raman System

Band Range 

200-3200cm^-1/200-1800cm^-1

NIR Spectrometer 

MWIR Spectrometer 

Imaging Spectrometer 

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