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WP 785 ER Raman Spectrometer + Laser

  • Extended 100 – 3600 cm-1 spectrometer range
  • High NA, f/1.3 optical design for superior sensitivity and SNR
  • Integrated 450 mW laser controlled via software
  • Interchangeable slit to adjust resolution & sensitivity
  • Free operating software, SDKs & matching libraries
Download WP 785-ER-IL-IC specifications

Complete Your Raman System

This extended range spectrometer with integrated laser is designed to give you control and flexibility in your sampling optics while covering the full fingerprint and functional bands, which makes it compatible with many applications. The onboard laser controls are provided through the spectrometer for ease of use and automated operation, with a single cord for power.

Make it a complete, semi-integrated Raman setup:
• Add our unique user-configurable probe or your own sampling optics
• Switch between liquid and powder samples with a multipurpose sampling chamber
• Install our free ENLIGHTEN™ software or use our SDKs to write your own code
• Receive a complimentary 1-year KnowItAll licence to perform Raman libary matching

Are you developing a product? We offer an equally sensitive but streamlined OEM design with excellent stability and reproducibility.

Optical Specifications

TEC-Regulated (-R)TEC-Cooled (-C)
Spectral Range*100-3600 cm-1200-3350 cm-1
Resolution10 µm slit7 cm-17 cm-1
25 µm slit8 cm-19 cm-1
50 µm slit13 cm-113 cm-1
Detector TEC setpoint10 ± 0.2°C-15 ± 0.2°C
Integration time3 ms – 60 s8 ms – 60 s
Spectrometer InputSMA 905 connector (lens or FC/PC optional), f/1.3 (0.39 NA)
Laser Type785 nm, multimode
Laser PowerUp to 450 mW, control via ENLIGHTENTM software
Laser OutputFC connector

*Start and end wavenumber may be customized, but total range is fixed. Contact us for options.

Note: Specifications are subject to change based on available components & manufacturing data.

Detector Cooling Options

We offer two detector cooling options for the WP 785 ER Raman spectrometer + laser, allowing you to balance your desired signal to noise and temperature stability against power draw and cost for maximum value:

  • TEC-regulated (-R): Detector is cooled externally to 10°C
  • TEC-cooled (-C): Detector has integrated cooling to -15°C

Need advice? Contact us to discuss what’s best for your specific application.

Software & Hardware

Operating SoftwareENLIGHTENTM Raman spectroscopy software & SDKs included
Library MatchingIdentify Raman spectra via Wiley's KnowItAll Raman Identification Pro
(free 1-year trial, fully integrated into ENLIGHTENTM)
Data InterfaceUSB 2.0 Type B receptacle
Max Sampling Rate> 250 Hz
Power Draw<1500 mW @ 12 V
Operating Temperature0°C to 40°C, non-condensing
Dimensions20.0 x 13.5 x 7.1 cm
Weight3.0 kg

Engineering Documents

  • ENG-0001 > Spectrometer USB Interface Specification
  • ENG-0034 > Feature Identification Device (FID) EEPROM Specification
  • ENG-0126 > Raman Laser Safety Interlock Behavior
  • ENG-0134 > Interchangeable Slit Exchange & Use (coming soon)
  • ENG-0157 > Empirical Power Draw and Power Supply Guidance for OEMs

Competitive Advantage

We’ve made it our mission to design compact, portable Raman without compromise – instruments that deliver superior sensitivity at a cost-effective price point. We place one of our own perfectly matched, patented volume phase holographic (VPH) gratings at the heart of every spectrometer. With uniform response and low loss, these gratings enable a compact and highly efficient all-transmission optical design that minimizes loss and maximizes stability for consistent, high-SNR spectra.


Significantly higher signal than other, ‘low cost’ compact spectrometers

Learn more

RAPIDCoconut oil spectrum, 1064 nm Raman (Wasatch Photonics vs reflective f/4 spectrometer)

Take measurements in a fraction of the time, with better signal to noise

Learn more

REPRODUCIBLEStandard vs OEM product system response - 785 nm Raman

Collect consistent spectra day-to-day and unit-to-unit using simple calibrations

Learn more


Minimal thermal drift, easily corrected; robust to shock & vibration

Learn more

Common Raman Spectral Bands

The pattern of peaks in a Raman spectrum is unique to the sample, providing a fingerprint which can be used to identify or analyze the material. The ‘fingerprint’ region up to 1500 cm-1 is often enough to confirm identity, while the extended ‘functional’ region out to 3600 cm-1 includes bands for additional, functional groups in a molecule. In addition to our standard models, we can design custom range spectrometers for OEMs. See below for common Raman spectral bands.WP-Raman-Bands-Graphic

Example Spectra

Alternate System Configurations

Need something slightly different? We offer a variety of alternate spectrometer models and system setups, and can offer expert advice on which may be the right match for your application.


  • Separate spectrometer, laser, and probe
  • Greatest flexibility & sampling options

WP 785 ER spectrometer


WP 785 spectrometer + laser

OEM Options

These drop-in modules form the heart of our standard products – in fact, our optical bench is our OEM bench – allowing you to perform R&D with our standard products and then migrate to the OEM equivalent for prototyping and production with no loss of performance. Learn more about our our ‘OEM by design’ philosophy.


  • Off-the-shelf spectrometer module
  • Add your own laser and sampling optics
  • Contact us for customization

WP 785 OEM spectrometer


  • Integrated spectrometer, laser & probe
  • 100 mW singlemode laser
  • Most compact OEM footprint

Contact us about this model


  • Integrated spectrometer, laser & probe
  • 450 mW multi-mode laser
  • Field-replaceable laser design

Contact us about this model

Other Wavelength Options

248 nm Raman
405 nm Raman
532 nm Raman
633 nm Raman
785 nm Raman
830 nm Raman
1064 nm Raman

Choosing the right Raman wavelength for your application is a question of balancing sensitivity and selectivity. Although shorter wavelengths deliver the strongest Raman signal, fluorescence background can degrade signal-to-noise ratio (SNR) if the wrong wavelength is used. That’s why we offer wavelengths from 248-1064 nm, matching your specific needs and sample type to the best wavelength for the application. Explore our alternate wavelengths below. Still unsure of what you need? Contact us for a personal consultation or sample testing.

Technical Notes

  • Reproducible Raman Measurements
    Raman OEM applications need consistent spectra to deliver dependable answers. Learn how to achieve >99.5% unit-to-unit agreement using a series of simple corrections.
  • Raman: Wavelength Matters
    Learn how to choose the right excitation wavelength to achieve maximum signal and minimum noise, from 405-1064 nm, for a wide range of sample types.
  • The Wasatch Advantage
    We’ve designed a spectrometer that maximizes efficiency at every step, to allow you to collect more light, keep more light, and detect more light. We'll show you how through its design.


  • Designing Raman Solutions
    Our toolbox for Raman spectroscopy gives you the flexibility to optimize your application without compromising on performance or size. Explore the many options!
  • Rapid Plastic ID with Extended Range Raman
    Raman spectroscopy beyond the fingerprint region proves ideal for polymer identification in high throughput sorting of plastics, discriminating within families & signaling the presence of additives.
  • Extending Raman’s Reach
    Learn how a reduction in spectrometer size need not mean a compromise in performance as compared to traditional benchtop Raman systems, thus expanding the possible applications served by Raman.

Cutting-edge results start with the right tools, and we’re here to help you excel. This spectrometer with integrated laser is designed to give you control and flexibility in your sampling optics, which makes it compatible with many applications. The onboard laser controls are provided through the spectrometer for ease of use and automated operation, with a single cord for power.

Make it a complete, semi-integrated Raman setup:

Are you an OEM? This unit is available in an equally sensitive but streamlined OEM design with excellent stability and reproducibility.


Need something slightly different? We offer a variety of alternate spectrometer models and system setups, and can offer expert advice on which may be the right match for your application, whether research, industrial, or OEM.


Do you need to measure beyond 2000 cm-1 or closer to the laser? 

We also offer our semi-integrated Raman system with a WP 785 ER spectrometer + integrated laser, which covers 100-3600 cm-1. This fingerprint + functional group range is a good forward-looking choice for research applications, or for industrial analysis of nanomaterials, water content, proteins, and other materials high in saturated bonds.

Learn more about the WP 785 ER spectrometer + integrated laser


Would you like more long-term flexibility to change the laser?

Consider a fully modular Raman system with separate spectrometer, laser, and probe. This makes it easy to reconfigure your system to mix and match components as desired, change sampling accessory, or to re-use existing equipment.

Learn more about our WP 785 spectrometer, or our extended range  WP 785 ER spectrometer


Do you want the most compact system and highest signal possible?

A fully integrated Raman system brings the laser, sampling optics, and spectrometer together into one unit, eliminating fibers which add coupling losses and can break. A fully integrated system delivers considerably higher signal thanks to the integrated optics.

Learn more about our WP 785-L Raman system


We give you control over configuration options like slit size, detector cooling, and spectrometer input to find the right specifications for your application (see below), and we provide options for range and system style when you need something different (see our ‘related products’ tab at right). Need advice, a demo, or want us to run a few samples? Contact us today

Wavenumber Range* 270 – 2000 cm-1 (all models)
Resolution 10 µm slit 6 cm-1
25 µm slit 7 cm-1
50 µm slit 11 cm-1
Spectrometer Input
f/1.3, SMA-905 connector or free space input (0.36 NA)

Cooling options None (-A) 10 ± 0.2°C (-R) -15 ± 0.2°C (-C)
Integration time range 3 ms – 60 s 3 ms – 60 s 25 ms – 60 s
Pixels 1024 1024 1024
Laser Output 450 mW, multimode, FC connector
Data Interface USB 2.0 Type B receptacle
Max Sampling Rate 250 Hz
Unit Size 16.5 x 16.2 x 8.2 cm
Unit Weight
Operating Temperature 0°C to 40°C, non-condensing
Power Consumption <500 mA @ 12 V (slightly higher w/ laser)

*Installed with 270 cm-1 longpass filter as standard; custom filters available upon request

Note: Wasatch Photonics specifications are subject to change based on current available components and known manufacturing data.

Choosing the right detector

We offer three detector cooling options for the WP 785  Raman spectrometer + integrated laser, allowing you to balance your desired signal to noise and temperature stability with power draw and cost for maximum value. Not sure what’s right for you? Contact us to discuss.

A detector: No cooling, ambient (~25°C), cost-effective option for many applications
R detector: TEC-regulated to 10°C, reduces need for regular dark measurements
C detector: TEC-cooled to -15°C, suitable for long integration times

Expand to see how these detector cooling options compare




Detector temperature 25 °C (ambient) 10 ± 0.2 °C -15 ± 0.1 °C
Benefits Most cost effective option for quick measurements Fixed dark noise (better spectral reproducibility) Lowest dark noise option – highly consistent
Signal to noise Good SNR high throughput detector Improved SNR compared to ambient detector Best SNR for lowest limits of detection
Applications Best for teaching and lab environments Great for variable environments & handheld use Ideal for long integration time measurements

Choosing your spectrometer input

How you route light to your spectrometer can vary depending on the type of sample, environment, and the goals of your measurement. The sampling coupling option is chosen at time of spectrometer order, but can be exchanged by special order.

WP-VIS-fiber-couplingFiber coupling to spectrometer (-S)

Using a fiber to route light to and from your sample is both flexible and convenient, and can help to minimize interference from ambient light in the measurement path. To get superior signal and ultra low background from our f/1.3 design Raman spectrometers, we recommend the use of matched NA fibers (0.36-0.39).  The image at left shows the SMA connector input to our spectrometer. A custom FC/PC input is available upon request (-FC).

Free-space coupling to spectrometer  (-F)

Coupling light directly into a spectrometer slit gives you the freedom to design your own sampling optics, controlling parameters like sampling spot size and working distance. This approach is good for creating compact systems while minimizing coupling losses due to fibers. Our Raman spectrometers have a 0.36 NA input (shown at left), accepting light up to 21° off axis (42° full angle).


    • Sensitivity
    • Thermal stability
    • Reproducibility

    When we created our Raman spectrometers, we designed the optics we would want as spectroscopists, supported by the mechanics we know our OEM customers need. The result is a robust opto-mechanical design in a compact footprint, electronic interfaces that match use cases for academic, industry and OEMs alike, and – most importantly – the most sensitive design possible in a compact footprint.

    We place one of our own perfectly matched, patented volume phase holographic (VPH) gratings at the heart of every spectrometer. With uniform response and low loss, these gratings enable a compact and highly efficient transmissive optical design that minimizes aberrations and alignment sensitivity for the optimum in manufacturability and thermal stability. The result? More than 10x better performance for Raman than a high-end f/4 crossed Czerny-Turner (CCT) spectrometer, and far less variability.

    Wasatch-Better-Sensitivity-Graph>10x BETTER SENSITIVITY

    Photons are precious, particularly in Raman spectroscopy, which is why we designed and built an optical bench that allows you to capture, keep and detect more photons. For cyclohexane excited at 830 nm at a fixed integration time of 2 seconds, our WP 830 Raman spectrometer with TEC cooling detects 10x more signal than the a similarly configured f/4 CCT spectrometer with twice the slit size. Access new applications and take your most challenging Raman measurements to the field with our high sensitivity.


    Increased sensitivity allows you to significantly improve the limit of detection (LOD) of your experiment. As a benchmark, we looked at spectra for six dilutions of isopropyl alcohol in water, from 12.5% down to 0.05%. Defining LOD as SNR=3, our WP 830 cooled Raman spectrometer is able to detect concentrations as low as 0.13%, as compared to 3.06% for an f/4 CCT spectrometer. With a >20x advantage in LOD, we can help you see lower concentrations of samples than ever before, without compromising on size or cost.


    Count on our spectrometers to reduce your acquisition time significantly. In a head-to-head comparison of Raman spectra of cyclohexane excited using a 28 mW, 830 nm laser, the WP 830 delivered a strong signal in just 2 seconds, while an f/4 CCT spectrometer with twice the slit size needed 21 seconds to achieve the same signal intensity. From high throughput quality monitoring to handheld measurements and trace detection, our spectrometers give you the answers you need in a fraction of the time.


    Off-axis stray light degrades spectral quality and SNR and affects LOD, which is why we use a transmissive design and aberration-corrected optics to detect every possible photon. Our VPH gratings offer up to 40% higher efficiency, more uniform response with wavelength and  polarization, and ultra-low scatter compared to reflective gratings. When tested against a TEC-cooled f/4 CCT spectrometer using a 900 nm long pass filter, our WP 830 showed half as much stray light – just 0.007% – for superior Raman performance.

    WP-thermal-stability-graphEXCELLENT THERMAL STABILITY

    A Raman spectrometer must perform reliably across a wide range of environmental conditions to avoid recalibration or compensation. To validate our opto-mechanical design, we monitored Xe spectra for our WP 785 spectrometer during temperature cycling, finding thermal shift to be <2 pixels over 0-40°C, half that of a typical f/4 CCT spectrometer. Our peaks also remain highly symmetric with temperature, giving you the thermal stability you need to achieve high accuracy in Raman spectral and library matching algorithms.

      Engineering Documents

      • ENG-0001 > Spectrometer USB Interface Specification
      • ENG-0034 > Feature Identification Device (FID) EEPROM Specification

      Brochures & Product Sheets

      Tech Notes

      • Why Wasatch for Spectroscopy? > See the data to validate our faster measurements, low LOD, high SNR, and excellent mechanical stability.
      • The Wasatch Advantage > Explore the optical design of our spectrometers and their performance benefits.
      • Wavelength Matters > Learn how to choose your ideal excitation wavelength based & minimize fluorescence background.
      • Raman Sample Coupling > Spectrometer or system? Probe or integrated laser? Data & tips to help you decide