Have You Noticed that Lasers "Speckle" (Ages 13+)

Рет қаралды 17,332

4 жыл бұрын

►WHAT IS THIS
Merry Christmas, lets talk about lasers! There are red lasers; there are green lasers - and they all speckle. Laser speckle is the graininess that we have all noticed around lasers. This video explores this topic while avoiding the perils of the FTC's new policies...
►TIMESTAMPS
1:20 - What causes speckle
3:40 - Trouble with COPPA compliance
4:56 - A boring presentation
7:38 - Safe?
9:00 - A Christmas song
►MATERIALS
HeNe vapor laser (633nm)
ThorLabs optical camera
►CREDITS
Narrator & Editor - Dayton Aardema
Blueprint Theme Music - Cody Aardema
Other Musical Works - ProScores
- Audioblocks
Visual Materials - Gateway Film Productions (1969)
- Prof. Herbert Gross, UNI-Jena
- Prof. Byungjo Jung
Equipment - Michigan Technological University
►MY POLICY
I attest that this video abides by United States Fair Use laws at the time of this video upload for uses such as education, review, parody, or any other transformative use of the material. I do not assume ownership of stock images or video should they appear in this video.
This video may be used in part or in full by any person or group for noncommercial use. Any commercial use of this content should be transformative such as for education, review, etc. I ask that any reupload of a significant portion of this content be credited to the creator(s) that appear in the credits of the video.
#Blueprint #COPPA

Пікірлер: 153

@CodyAardema 4 жыл бұрын

Hi, im 9yo and I had a question about how you calculated the contrast coefficient. how did u calculate the standard deviation?

@bigredinfinity3126 4 жыл бұрын

13+ come back when your older

@SomeRandomPiggo 4 жыл бұрын

@@bigredinfinity3126 lmao I'm 11

@jamess.7811 4 жыл бұрын

Bruh

@omsingharjit 4 жыл бұрын

What !!! Exactly same come how it appeared b4 this video . Time travel paradox 😵😱

@bradbrandon2506 3 жыл бұрын

This 9 year old is definitely going places! You're going to make a great scientist some day!

@stimpyfeelinit 4 жыл бұрын

I noticed this as a kid when I used to shine chinese dollar store lasers directly into my retina as well.

@BlueprintScience 4 жыл бұрын

Same here... We all make bad decisions ;)

@KingJellyfishII 4 жыл бұрын

@@BlueprintScience same... It was an infrared thermometer's guidance laser thing for me

@Oscar4u69 4 жыл бұрын

was your vision affected in some way after doing that?

@shlonk 4 жыл бұрын

I did this too. I’m a dumbass

@KingJellyfishII 4 жыл бұрын

@@Oscar4u69 nah they're really weak and not well focused so for short times it's probably fine but it's best not to anyway

@Name-js5uq 4 жыл бұрын

Oh my God, you are borderline absolute complete genius!I only made it halfway through your video and I had to comment. this is so incredibly awesome I can't wait for the last half,I absolutely love the lengthy explanations that's the best part of the whole video!you have made me so freaking happy on Christmas Eve this is such a Christmas gift thank you so very very very very much 🎄🎅😊😊,... Now I have to watch the second half.

@JimGriffOne 4 жыл бұрын

Oh yeah, I noticed this effect too! I even focused my eyes to far or near and it didn't seem to change the speckle pattern. Thanks for the video. :) Oh, and Merry Christmas to you and your family! Hope you all have a good one.

@budy238 4 жыл бұрын

That end was so well done.

@ClaytonDarwin 4 жыл бұрын

Love your videos. Thanks for all the effort. Ever notice the crazy amount of intense speckle you get from a laser on an agate? Really crazy effect. Has to be semi transparent.

@manueljenkin95 2 жыл бұрын

Thank you very much for this video. I have studied briefly about speckle noise in my optics course, but haven’t really grasped it well enough until this video.

@joshberna5801 2 жыл бұрын

Great video, as always! I was playing (I mean 'experimenting') with a handheld green laser pointer recently and as I was shining the bean back and forth between two parallel mirrors that were facing each other, I noticed that as reflected dots came close to touching they produced a very interesting diffraction pattern. It reminded of ripples on a pond

@BadReligi0nFan69 4 жыл бұрын

Dude I love your channel, I'm a Molecular Biology Major and have to take Physics and was never great in the class but love lasers and learned so much from your channel along with a book on Electromagnetic Waves and Lasers. Keep on teaching, my man.

@BlueprintScience 4 жыл бұрын

Thanks dude :)

@Name-js5uq 4 жыл бұрын

Okay you are an absolute certified complete genius. This video should be seen by everybody you are so so so talented ❤️. I laughed so hard! Thank you again Dayton.

@BlueprintScience 4 жыл бұрын

Thanks, glad you liked it!

@KingJellyfishII 4 жыл бұрын

OH MY GOD I'VE WONDERING THIS MY WHOLE LIFE (sort of) THANK YOU

@BlueprintScience 4 жыл бұрын

Same! Now we know why in more detail that we ever needed to!

@KingJellyfishII 4 жыл бұрын

@@BlueprintScience lmao yes. I guessed it'd be something about interference but I thought because light has such a short wavelength the speckles would be on the order of the the wavelength of the light or maybe 10x/100x but that'd still be way too small to see. But I (think I) understand now!

@Ktulu789 4 жыл бұрын

I have a USB charging cable with a green LED light, not a laser, which produces the same grainy dots. I thought that only laser creates that effect until I noticed that on the LED.

@aVoidPiOver2Rad 4 жыл бұрын

I love the more in depth explanation. Feel free to go as deep as you like. I'll probably watch it ^^

@BlueprintScience 4 жыл бұрын

jello klotz, I’ll remember that

@randomstuff3916 Жыл бұрын

Informative and humorous...... I like it

@kevin-uy6xv 4 жыл бұрын

Nice explanation! I'm now a college student and it really helps me a lot on my experiment and the video is interesting too!

@PlasmaChannel 4 жыл бұрын

Dayton! Excellent video! I always wondered what the laser speckle was about, as recently as last week. Your video quality was really high, and I feel for you with COPPA. It’s a mess. But I love how you address it in the video. Cheers!

@BlueprintScience 4 жыл бұрын

Thanks ;) Happy Holidays, Jay

@awesomefeldmanfamily 4 жыл бұрын

Yo I love when cool KZfaqrs watch other cool KZfaqrs!! I also commented on your other comment in intigza's video(the Portuguese guys that sounds like FPS Russia) love your channel also plasma channel!

@PlasmaChannel 4 жыл бұрын

Dovi Feldman thank you very much!

@awesomefeldmanfamily 4 жыл бұрын

Sweet!

@keithking1985 4 жыл бұрын

plasma channel,, jay whats COPPA?? are they some sort of regulatory shit or something??

@VoidHalo 4 жыл бұрын

One interesting optical phenomenon I've always wondered about is when I look at a sodium street lamp, I see these concentric rings that radiate outwards from the source of the light through the halo that surrounds it. They look almost like a moving interference pattern. I always wondered if it was just my eyes playing tricks on me, or if there as something related to physics going on. Anybody else notice this effect?

@BadReligi0nFan69 4 жыл бұрын

Hey man love the channel, if you see this, got a question: What is the reason for the most pronounced refraction is exhibited in wavelengths of lower value? Or there is more diffraction with high energy light compared to low energy light. For example why purple diffracts more than red light in compared to one another. Thanks, not a Physics student, a Molecular Bio student and interested in light, and lasers.

@NSaw1 4 жыл бұрын

Could this be the same effect that makes shadow bands during a solar eclipse? A few years ago I was lucky to have a total solar eclipse where I live, and I had herd about shadow bands and that that it's easier to see them on something white. so I got an umbrella with white on the underside of it, and I saw the shadow bands. But it was weird If I focus on the umbrella I can't see them but if my eyes go out of focus than I see them. It was very cool and weird, what do you think?

@TestEric 5 ай бұрын

I have always wanted to know what that effect was and could never find it before. Thank you!

@Compguy321 4 жыл бұрын

Could you please share your program (e.g. provide a link to it in the description)? I am experimenting with a laser (and video / images of the results) that I want to analyze, and I think what you have written so far could really help!

@EarlGray_kd7sjt 4 жыл бұрын

Wow! Its been a while. Good to see you back.

@BlueprintScience 4 жыл бұрын

It's always been a while. Its hard to find time to make these...

@EarlGray_kd7sjt 4 жыл бұрын

@@BlueprintScience Well I'm glad to see you making vids again :) I like learning and you make it fun.

@BlueprintScience 4 жыл бұрын

@Xonk61 4 жыл бұрын

being near-sighted, when I'm not wearing optical corrections, the sparkle moves opposite to the direction I move my head. When wearing glasses, it moves in the same direction as my head.

@phonotical 4 жыл бұрын

You think if you traveled faster than light, red or blue shift would start to eliminate?

@MrJuuustin28532 4 жыл бұрын

Awesome!

@MsHojat 3 жыл бұрын

7:15 wow that is incredible!

@controlengineering9254 3 жыл бұрын

Amazing video thank you

@Oscar4u69 4 жыл бұрын

I noticed this since time ago... this video explained it in a very clear manner, so clear even a kid can understand the explanation D: OH NO! (great video btw)

@BlueprintScience 4 жыл бұрын

Oh no...

@ChickenPermissionOG 8 ай бұрын

I miss this dayton, come back please?

@nameismetatoo4591 3 жыл бұрын

Here's a cool experiment for anyone who has a laser: Shine a laser on a wall approx. 6 feet in front of you and move your head side to side (i.e. parallel to the wall). Observe which direction the speckle appears to be moving. If the speckle is hard to see, try shining it on different surface materials. Some object show the speckle better than others. If you have 20/20 vision or are wearing glasses to correct for nearsightedness, you will see the speckle moving in the same direction as your head. If you are nearsighted, remove your glasses and repeat. You'll see the speckle now moving in the opposite direction. Next, do the same thing as before (with your glasses off) but slowly move closer to the dot as you move your head side-to-side. At a certain point, the speckle will go from moving in the opposite direction to moving in the same direction. It will move horizontally, then vertically before finally moving in the same direction as your head. The distance between your eyes and the dot on the wall should be approximately the distance at which your vision begins to get blurry without glasses.

@shivajoshi9068 4 жыл бұрын

Seriously the second part was awesome Can you correlate diffraction pattern or double silt pattern with perspective(like how we view it)? Also we generate any kind of pattern of interference ?

@BlueprintScience 4 жыл бұрын

Two very smart questions; the answer to each is yes. During my research, one of my sources actually talked in length about the double slit experiment. A Young's double slit experiment can be set up to measure the spatial coherence of light, which is directly related to speckle patterns. A web search shows plenty of info. You can make any arbitrary speckle pattern. This is done by splitting a laser beam into two parts, altering only one of the beams, and recombining them to form a interference pattern. This interference pattern can be stored on films to make 3D holograms by reconstructing interference patterns into images. I made a video on this about a year ago... Hope that answers your questions; Merry Christmas

@FrankSquirel 4 жыл бұрын

I thought diffuse reflections do not depend on the perspective of the viewer while specular reflections do. Could I get a clarification for the explanation since you say it's the diffuse reflection that causes the shimmers to move with the viewer's perspective?

@4dirt2racer0 3 жыл бұрын

oooOOOoooo.... sweet thanks great video

@DamithaNadeeshaWanniarachchi 4 жыл бұрын

Can you do a video on corona motor?

@mijayd1 4 жыл бұрын

I remember a bunch of us at the UofU trying to figure that out back in 92 or 93.. but the building we worked in was Biochemistry related so not much help lol

@BlueprintScience 4 жыл бұрын

Your question would go on to be answered by somebody not yet born at the time of curiousness...

@mijayd1 4 жыл бұрын

@@BlueprintScience Thoroughly.. answered...

@luongmaihunggia 4 жыл бұрын

This video is fun for all ages

@BlueprintScience 4 жыл бұрын

Oh no...

@jafinch78 3 жыл бұрын

Don't forget about spectrometers and spectroscopy using interferometers. Those are way better systems thanks to lasers. Then there's laser ablation and not only for spectroscopy... for medical devices. Thanks for sharing!

@KowboyUSA 4 жыл бұрын

Was just messing around with a green laser and noticed the speckled laser dot becomes a horizontal dash when I'm wearing my reading glasses.

@luigivercotti6410 4 жыл бұрын

polarized glasses?

@KowboyUSA 4 жыл бұрын

@@luigivercotti6410 nope. Just regular, cheap reading glasses.

@christopherkickdintheface7677 4 жыл бұрын

I enjoyed the video thank you

@BlueprintScience 4 жыл бұрын

np :)

@budy238 4 жыл бұрын

best video ever

@Yoshi-zt5df 4 жыл бұрын

Would love to see some more "not family friendly"/morally ambiguous topics for videos similar to the one in the Verge article.

@BlueprintScience 4 жыл бұрын

“Morally ambiguous”? You mean straight up criminal? Let me think... nah fam.

@phonotical 4 жыл бұрын

I always thought it was the light shining through the glass due to tine stresses or thickness differences, because you can make the same pattern repeatedly, looks just like through a microscope

@BlueprintScience 4 жыл бұрын

Yeah, that’s objective speckle at work. The small random variation in light path through glass causes the phase shift and resulting speckle.

@phonotical 4 жыл бұрын

@@BlueprintScience kinky! Happy Christmas

@kushalsehgal 4 жыл бұрын

I’m 12, but mom and dad let me watch Blueprint before bedtime.

@BlueprintScience 4 жыл бұрын

Wait, you were only 8 when we were in high school?!?!

@tomg379 4 жыл бұрын

Love your glasses:-)

@BlueprintScience 4 жыл бұрын

B-)

@jamest.5001 4 жыл бұрын

Hi, I'm 11 years old, and ha-ha, Merry Christmas! And happy holidays

@JDoawp 4 жыл бұрын

Man I really wish I understood the second half of the video. Good explanation though, at least for the stuff I did understand

@BlueprintScience 4 жыл бұрын

thanks :)

@owendavies8227 4 жыл бұрын

This answered a question I have had for a very long time. I wonder how LSI and LSR work. I wonder if you could make a computer using laser interference for logic..

@BlueprintScience 4 жыл бұрын

Owen Davies, glad I could enlighten you :) That computer idea... may just be crazy enough to work

@owendavies8227 4 жыл бұрын

I suppose you could make an or gate by lining up two laser beams so that they interfere constructively and an xor by having them interfere destructively. from which you could make all gates, but I have no idea how well that would work.

@keithking1985 4 жыл бұрын

oh my god,, I just got "de sha vu" reading your post!!! swear to god... FREAKY!! p.s. cool idea with the gates!!

@victorfox9623 4 жыл бұрын

9 yr old army destroys channel by hitting the like button.

@MaxineZauner 4 жыл бұрын

Is it just me or is the second part of the video more entertaining than the first part

@BlueprintScience 4 жыл бұрын

I just conferred with a doctor. You are showing early warning signs of "smarts" - and incurable congenital disease.

@MaxineZauner 4 жыл бұрын

@@BlueprintScience Hmm, I should probably get that checked out

@LarryLane07 4 жыл бұрын

You're a beautiful person with a beautiful mind

@BlueprintScience 4 жыл бұрын

Aw, thanks 😊

@Steaphany 4 жыл бұрын

Formulas are fun

@Mhavskie 4 жыл бұрын

George of the beatles

@Ktulu789 4 жыл бұрын

I have a USB charging cable with a green LED light, not a laser, which produces the same grainy dots. I thought that only laser creates that effect until I noticed that on the LED.

@BlueprintScience 4 жыл бұрын

LEDs shouldn’t do that, they only produce spontaneous emission whereas lasers produce stimulated emissions. Translation: LEDs are not coherent light. My guess is that the light is affected by the foggy plastic that surrounds the LED or a defect in the parabolic mirror that directs it forward.

@Ktulu789 4 жыл бұрын

@@BlueprintScience my phone can't really take a good pic of the effect but check it out. imgur.com/a/fvJNOwT IRL it looks as radiating in the air with static grains and all. It's a magnetic micro USB cable but maybe any bright SMD LED looks the same. I can only see the effect in the dark.

@keithking1985 4 жыл бұрын

just saw your picture,, iv seen chargers doing the same thing a few times too.. and other things not just charges??? weird..

@Ktulu789 4 жыл бұрын

@@keithking1985 yeah, it's just a LED inside, a pretty bright one, but nothing special. I don't think it's a laser diode in there, and the illumination it produces is not collimated either.

@keithking1985 4 жыл бұрын

iv seen the same thing myself and not just with those charger leads.. it always seems to happen with smd LED'S too, maybe there been driven to hard or its just a phenomena in its own with those particular LED'S!!

@uK8cvPAq 4 жыл бұрын

I often shine lasers into my neighbor's bedrooms.

@omsingharjit 4 жыл бұрын

8:33 😂😂😂😂

@bradbrandon2506 3 жыл бұрын

Ohhhhh after 28 years I finally found out it's interference! I didn't even consider it!

@vraielumiere Жыл бұрын

The sun is a laser's focal point

@bpark10001 4 жыл бұрын

You fail to mention one most useful application for laser speckle: determining your eyeglass prescription! Put a 1/2 inch thick piece of undyed wax (white candle works OK, as well as slab of canning wax) right in front of a green DPSS laser pointer. (The newer "direct diode" lasers are not spectrally pure enough to get good results.) The wax becomes luminous with the green light. View this from 10 feet away with one eye (cover other one). As you move sideways, graininess will appear to move. If movement is "with" head motion, your eye is focusing beyond the target (eye is far-sighted). If movement is "opposite" head motion, eye is focusing short of target (eye is near-sighted). Buy eyeglass blank lenses (www.superoptical.com/finished-single-vision/finished-single-vision-products) spherical in 1/4 diopter steps +/- from zero. If nearsighted, repeat test using negative lens; if farsighted, repeat test using positive lens, until you find lens that neutralizes motion. You now have the spherical part of your prescription!

@BlueprintScience 4 жыл бұрын

Interesting!

@bpark10001 4 жыл бұрын

@@BlueprintScience You need to make a video why this happens. I can help with the explanation.

@keithking1985 4 жыл бұрын

very cool video, : ) I think every inquisitive mind notices this speckle!!!!

@BlueprintScience 4 жыл бұрын

Glad I could render some assistance to an inquisitive mind

@keithking1985 4 жыл бұрын

thanks Dayton,

@noelandrew3600 4 жыл бұрын

where is your laser safety glasses?

@BlueprintScience 4 жыл бұрын

No need. Everything here is class 2 and under :)

@masontv385 4 жыл бұрын

I like your jabs at KZfaq.

@BlueprintScience 4 жыл бұрын

Yeah, I might have been a little tone deaf there. KZfaq and COPPA are both fine. I was trying to make fun of people who are way too worked up by it.

@masontv385 4 жыл бұрын

@@BlueprintScience Understood. Nice videos

@stever197037 3 жыл бұрын

Could you explain for your viewers how the particle accelerator experiment to prove light is a particle is bunk science. No result was found untill it hit the surface. The result was the reaction of the beam hitting a surface. Not found in the beam, just the reaction.

@BlueprintScience 3 жыл бұрын

I'm nowhere near qualified to speak to the particle/wave duality of light. However, it is generally understood on a quantum level by the Schrodinger equation. When designing lasers, we generally decide what equations to use based on which effect dominates. For example: laser doppler shift assumes light as a particle and laser speckle assumes it as a wave. It's a messy science.

@stever197037 3 жыл бұрын

@@BlueprintScience Thanks for your response. But my point was that a particle has never been found in the light itself in a clean environment. I wasn't looking to prove if there is a particle or not. Even though I stand with not. Rather that the science has never proven a particle. Light excited matter in a cardboard slit. ( contaminated )experiment. An electron beam hit a surface in the particle accelerator to make a reaction. Just saying that the science is lame.

@BlueprintScience 3 жыл бұрын

@@stever197037 Sorry, don't know what you're talking about

@stever197037 3 жыл бұрын

@@BlueprintScience Cool. Was just trying to help correct a wrong to further progress. Because a photon is just a measurement tool and stifles the science giving more belief that a reaction that creates light as a side effect is said to magically create matter. It's absurd. It's like bloodletting. People have witnessed a side effect and attribute it as a source.

@pluckhandle109 2 жыл бұрын

[🤣🤣🤣🤣 I was wondering why when I said department of children and families they muted me. Thanks! ]

@phonotical 4 жыл бұрын

Wait... You're saying the moon film by Stanley kubric wasn't faked because if he used a laser the whole scene would... Shine?

@bomxacalaka2033 4 жыл бұрын

Phonotical oh yes that’s true, tho the laser would cost more than actually going to space

@phonotical 4 жыл бұрын

@@bomxacalaka2033 I'm sure the collimating lens would be twice as much 😂

@BlueprintScience 4 жыл бұрын

Why does everybody say that you would have to use lasers? You can place a point light source at the focal point of a Fresnel lens to get a large, collimated, linear light path that would look 99% realistic on set. It's basically like magnifying sunlight in reverse. Moon landing confirmed fake???

@phonotical 4 жыл бұрын

@@BlueprintScience think you'd get banding patterns on the ground

@gadex-iq3ic Жыл бұрын

I'm black 43 Years ~ birthday every 4, ,1980 leap year baby how old am I'm Really????? 10 years old ..... Anyway. You're sarcasm message was on point literally.. between set and complaining I fell off the f****** chair in the air.... I feel like I got robbed bottom by The Rock .

@slowburntm3584 4 жыл бұрын

Wow, near 200 likes without a single contrarian (sp?) Dislike... Impressive!

@BlueprintScience 4 жыл бұрын

Wow! That never happens...

@juliocamacho8354 4 жыл бұрын

@@BlueprintScience 1 dislike by KZfaq now

@BlueprintScience 4 жыл бұрын

@@juliocamacho8354 lol

@jon87386 4 жыл бұрын

>mfw blueprint cares about ads when he doesn't have any enabled to begin with

@karlharvymarx2650 4 жыл бұрын

Wow, on little sleep, I didn't understand anything in this video. I just posted my first video which is visual and sound effects and marked it as adult so I wouldn't have to worry about stupid kids being traumatized by, amateurishness, bad editing or whatever some ambulance chaser can make up. Are you saying that by marking it as adult, I'm actually opening myself up to a lawsuit? Would it have been safer to mark it for kids and flash curse words and a nitroglycerin howto on the screen? Should I stick with a black screen and no audio? Why the fuck doesn't youtube just limit kids to KZfaq Kids videos? As for speckle, is it being used in microscopy to make an educated guess about how far sticky outy bits stick out relative to one another on little doodads to create a high resolution heightmaps for assembly into 3d models? Kind of like zillions of little interferometers which can be observed as distance between laser and subject move? Why do cats never have belly buttons useful as lint traps?

@BlueprintScience 4 жыл бұрын

You don't need to worry about COPPA for stuff like that. I was just exaggerating in my video - I also have nothing to worry about. Only mark as "for kids" if its actually intended for kids. As for the second thing, its interesting... I think. Not gonna lie, I don't know why we are talking about cats.