Optical Grating Mastering

Optical diffraction gratings are common devices for measuring wavelengths of light, consisting many diffraction elements at regular intervals – namely gaps and ridges – which can influence the phase and amplitude of the incident light in fixed alternation. 

optical-grating-mastering-light-diffract

Lasers for Optical Grating Mastering

Optical diffraction gratings are common devices for measuring wavelengths of light, consisting many diffraction elements at regular intervals – namely gaps and ridges – which can influence the phase and amplitude of the incident light in fixed alternation. 


A practical example of optical gratings is their use in spectrometers. An entrance slit is placed in the focal plane of a lens, causing any incident light to pass through and become parallel. The light then hits the grating, causing dispersion of the incident light into its constituent wavelengths, and the intensity distribution can be viewed directly or recorded photometrically.


Gratings can be in transmissive or reflective arrangements and are widely used in a variety of different laser systems. Installed inside and outside of the resonator, these gratings are used for wavelength selection, beam splitting, beam shaping and polarisation. High-performance laser gratings are characterised by their damage threshold at certain wavelengths, as well as high pulse width, repetition rate and diffraction efficiency in the direction of polarisation. 


Holographic and interference lithographic processes are common in optical grating production, although high-quality spectroscopic gratings have only been made available by the introduction of high-resolution paints and short-wave lasers. A grating can be created by drawing a fine laser interference field in relief on a photoresist layer, where the interfering waves can be generated by wavefront or amplitude splitting of coherent laser beams - most often lasers in single-mode operation.


The overall efficiency and quality of gratings created in this way is dependent on several characteristics of the light source used, such as wavelength and polarisation, and when considering a suitable laser for Optical Grating Mastering, the following parameters should be considered:


1.     High Power
A short exposure time is generally desirable, as this can reduce disruptive external influences, such as vibrations. A higher light intensity is therefore preferably used.


2.     Power Stability
Fluctuations in output power during the production process amplifies the interference pattern, causing inaccuracy. Therefore, ultra-stable output power and imperceptible power noise are vital for ensuring the quality of optical grating masters.


3.     Beam Quality
Excellent beam quality and pointing stability are also key parameters for ensuring consistent and accurate analysis.

UniKLasers design and manufacture single frequency continuous wave laser sources with unrivalled wavelength stability, narrow linewidths and long coherence lengths over a range of wavelengths within a small footprint. We currently offer single frequency lasers in the red and green areas of the visible spectrum with our Solo 640 Series and Duetto 532 Series respectively, along with our infrared Solo 1064 Series and ultraviolet Duetto 349 Series.
 

 

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