These instruments are calibrated to measure the spectral irradiance of lasers in units of watts per meter squared over the wavelength range in nanometers provided by the selected spectrometer model. Currently, StellarNet offers laser measurement systems in the 200-2300nm range. The table below details the various ranges for each StellarNet Spectroradiometer.  All of StellarNet's spectrometers can be configured for laser measurement including the new BLUE-Wave and GREEN-Wave spectrometer models. Calibrated spectroradiometers can be used to capture laser intensity profiles and shape while standard StellarNet spectroradiometers can be used to measure beam shift and centroid wavelength.

See more StellarNet Measurement Diagrams!!

Laser Measurement systems include a StellarNet spectrometer, fiber optic cable, receptor (cosine receptors or integration spheres), and an optional irradiance calibration.
 

NIST Calibrations

• The factory performs calibrations for the appropriate wavelength range of your spectrometer using NIST traceable calibration lamps (calibration service IRRAD-CAL must be ordered with spectrometer and proper measurement accessories)
   

• Fast delivery: most system can be calibrated and shipped within 1 week after receipt of order
   

• Absolute calibration: accuracy within 10% at detector integration setting used for calibration
   

• Certificate available: documentation with NIST traceable serial numbers.
   

• If the user has an appropriate irradiance calibration source lamp, a field re-calibration can be easily performed using the included SpectraWiz software

BLUE-Wave-NIR2b model spectrometer (785-1200nm). The software measures the "centroid" of laser to provide center wavelength accurately.  The centroid calculates the area under the laser spectrum then divides the area in half to locate the center of the spectra and thus an accurate wavelength. 

StellarNet also has extended range spectroradiometers for laser measurement available to measure spectral irradiance over a wide range of wavelengths.  The EPP2000UVN-SR spectroradiometer with CCD detector array covers a range of 200-1100nm.  The BLACK-Comet-SR super range, dual blazed, concave grating spectroradiometer offers a range of 230-1100nm while retaining all of the characteristics of a concave grating spectrometer!!! In addition, StellarNet offers a Dual Channel Spectrometer system for spectroradiometry, the Dual DSR (Detector Super Range) combines a CCD and InGaAs detector to cover a wavelength range of 200-2300nm for selected models.

TTL Trigger Options
Some StellarNet spectrometers can be configured with a TLL input (StellarNet Part # JACK-IN; $100) or output (StellarNet Part # JACK-OUT; $100) to enable the spectrometer to scan when triggered by an external light source (i.e. laser, flash lamp, etc.).  The electronic triggering option was first developed for the StellarNet PORTA-LIBS systems for elemental analysis, but now is available in all spectrometers using StellarNet standard 16-bit electronics.  

TTL PDF
 

High Resolution Spectrometers
The EPP2000-HR High Resolution fiber optic spectrometers are available in several low cost models for UV, VIS, and NIR applications.

The HR spectrometers have double the resolution over standard models with the same grating. The wavelength range is reduced by the same factor.  Resolutions better than 0.1nm can be achieved depending on selected model range, detector, and slit size. 

Applications include wavelength monitoring and characterization for tunable lasers/LEDs and other sources such as elemental emissions from plasma & Laser Induced Breakdown Spectroscopy. Also, optical sensing of temperature, pressure, & position are enabled via Bragg grating technology.

EPP2000-NIR2-HR  HgA Emission Spectra using EPP200-NIR2-HR model spectrometer. StellarNet spectrometers can be built to customer specification in most cases. There is no extra charge for a 'custom' range spectrometer; however, it does becomes a non-returnable item.


RED-Wave-NIR3-HR InGaAs-1024
model spectrometer for the WDM band showing a laser line. FWHM = 0.7nm.

StellarNet Cosine Receptors allow collection of light with an 180 field of view using demountable diffusers with ~10% loss.  The CR1-UVN is a ½” diameter near cosine receptor using a sanded fused silica diffuser for 200-1700nm and has reduced 90° FOV and low 7% loss.     

StellarNet Calibration
The factory performs several x-axis calibrations on all spectrometers and depending on customer application a StellarNet spectrometer may be calibrated also in the y-axis for absolute intensity measurements.  A y-axis Irradiance calibration is performed using NIST traceable lamps.  There are several available calibrations depending on your spectrometer wavelength range and slit size.  This irradiance calibration service (IRRAD-CAL) is optional.  If the user has an appropriate irradiance calibration source lamp, a field re-calibration can be easily performed using the included SpectraWiz software.

IRRAD-CAL........................................300-1100nm

IRRAD-CAL (NIR)..............................900-1700nm

IRRADUV-CAL...................................200-600nm

IRRADCAL-UVN................................200-850nm

*Note- Spectrometer range can be smaller than calibration range.  Also, IRRAD-CAL and IRRADUV-CAL calibrations can only be preformed simultaneously on BLACK-Comet concave grating model spectrometers.
Irradiance Calibration PDF
 

Power and InterFace
Portable spectrometers include a high speed USB-2 interface cable.  All miniature spectrometers with a CCD detector (GREEN-Wave, BLUE-Wave, BLACK-Comet, and new EPP2000 models) are powered by your computer's USB port while spectrometers with InGaAs detectors (RED-Wave) require an external 5V supply.  New Big Wave electronics allow plug in play operation through on board memory where all coefficients are automatically loaded into your software.

High Resolution NIR WDM Spectrometers
In fiber-optic communications, wavelength-division multiplexing (WDM) is a technology which uses high resolution NIR spectrometers.  WDM is based on the concept of using multiple wavelengths of light on a single fiber by using different wavelengths (colors) of laser light to carry different signals.  Conventional WDM systems provide channels in the C-band of silica fibers around 1550 nm.  StellarNet uses an HP tunable laser source for calibration of the high resolution unit. The NIR3-HR InGaAs 1024 is recommended to cover the 1500-1640nm range and provides FWHM of 0.7nm (see above spectra).