Spectral characteristics of LED

Grating Spectrometer

Holmarc’s grating spectrometer consists of a holographic concave diffraction grating and a one-dimensional CCD detector array. It delivers excellent thermal stability with low stray light for wide range of research and OEM applications. The concave gratings accomplish the task of two optical elements in a single, easily integrated component. It has one micrometer controlled variable input slit with LED holder.

The spectral power distribution of the optical radiation emitted by LED differs in many ways from other radiation sources. It is neither monochromatic like a laser nor broadband like a Tungsten lamp but rather lies between these two extremes. The spectrum of LED has a specific peak wavelength depending on the manufacturing process where the FWHM is typically a couple of tens of nanometres. Holmarc’s grating spectrometer gives fast and reliable LED spectral characterization.

Spectrometer interfaces with a computer via Type-B USB 2.0. The entire power requirement is drawn through the 2.0 type-B USB connector. Spectra QSR software gives the output plot of intensity versus wavelength.

Experiment:

To analyze emission spectrum of laser and study the peak wavelength and FWHM

Other parameters like Centre wavelength, Centroid wavelength, Dominant wavelength, etc can be studied.

Specifications:

Spectrometer F#	2.9
Dispersion Element	Concave Grating
Wavelength Range	350 - 1050 nm
Resolution	0.9 nm
Detector	Toshiba TCD1304AP Linear CCD Array
Connectivity	USB 2.0
Software	Spectra QSR V2.26

Graph:

Related Topics:

Peak wavelength

Centre wavelength

Dominant wavelength

Spectral band width

Centroid wavelength

 

Scope of Delivery:

Optical Rail

Kinematic Laser Mount

Cell Mount

Polarizer Rotator with Mount

LED with Power adapter

Collimating optics with Optical Fiber

Grating Spectrometer

Diode Laser with Power supply (Red)

Accessories

Instruction Manual