Blazed gratingefficiency

Hi I read the  file but I am still not sure how to  meet the blazed grating condition.  I am illuminating the dmd with 24 degree angle from the dmd normal but I see that the diffraction orders are still not equal in intensity. I see as shift in them  Can you please help in calculating the blaze condition for my laser of 520 nm wavelength?

Hi I am trying to used the DMD as  diffraction grating. when I make a grating of 12 pixels on the dmd I see that it diffracts the laser (520) . I see two patterns, one due to blazed grating effect of the dmd ( that is when there is no  pattern and light is shine on it, you still see a 2D diffraction pattern). and the other one due to the pattern. However as per theory, the + and - order of the diffracted light should have same power which is not the case. Can someone help me find my mistake?The mirrors are tilted at 12 degrees, so in order to make the reflected light from dmd to go perpendicular, the laser light falls on it on angle 24 degree. However I put around 30 degrees in my case as  it worked for me .  Since it is very crucial for me that the power values for both the orders match. Can anyone tell why is it not so?

Blazed gratingmeaning

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by K Han · 2019 · Cited by 6 — 2. Factor Definition. Typical beam quality factors like PIB (power in bucket), M2, and β factors are usually obtained just by light intensity ...

Echelettegrating

Since the envelope center is not exact in the middle of 4 orders then 3 of them are brighter.  Please see section 5.2 of the second app note - System Design Considerations Using TI DLP® Technology in UVA (363 – 420 nm) (Rev. A).  This section has the formula you need to calculate the incident angle.  Please send me friend invite if you are still having a difficult time with it.

To be honest I did not grasp the concept clearly, I will tell you want I am doing and I hope you can tell me what I should do. So when I keep the incident angle around 24 degree,  the reflected light from the dmd is almost normal to the dmd surface and shows 2D diffraction with several spots. then I project a binary grating of 12 pixel pitch on the DMD. after this, the central spot ( which looks the brightest to me) splits into three spots(-1,0,1)  . I am these 3 spots to pass through my  objective to generate a sinusoidal pattern. However, I am not being able to get sharp fringes. Which I believe might be due to unequal power of the (+1 and _1)  Now even if I do not project the pattern on the DMD I still see the central spot to be brightest but the spots on the one side are brighter than the other side. which I do not understand why. Since the incident angle is 24, the zeroth order and the since envelope should coincide and I should get maximum power in the zeroth order only. as per the theory so why is that I am not getting equal power in my +1 and -1 order. I hope I have kept my situation clearly.

Littrowgrating

Objectives are also instrumental in determining the magnification of a particular specimen and the resolution under which fine specimen detail can be observed ...

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System Design Considerations Using TI DLP® Technology in UVA (363 – 420 nm) (Rev. A) - this one will help understand the different blaze conditions even though you are not working in the UV, the principles are still the same.

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Blazed gratingpdf

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Gratingblaze wavelength

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LOCA is used in an optical bonding process where the air gap between the touch display and cover lens is filled. This adhesive is cured using UV light instead ...

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Blazedtransmissiongrating

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Blazed gratingequation

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The discovery of free radical-induced modifications of biomolecules (i.e 5',8-purine cyclonucleosides and trans membrane lipids) as products of stress in ...

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In the documents you read it provides a discussion about how to maximize one order (a blaze).  To try to make four orders equal in value you need an "anti-blaze" condition (a term I coined for it).  This means to set the order of interest in the calculations to n +/- 0.5 which will result in an anti-blaze condition.  Be aware that it is not always possible to reach a condition you want.  If you try say order 8 + 0.5 and cannot reach an anti-blaze then try 8 - 0.5.

Infrared radiation (IR) is a type of radiant energy, with longer wavelengths than the visible light humans can see, but shorter wavelengths than radio waves.

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