Future of lasers

RedCowboy said:

The way I understand it we can slow the forward progression, we have seen velocity time dilation and gravitational time dilation moving forward, rather we can experience time dilation, we have to account for the earth's gravitational effect on the fabric of space/time in order to calibrate our GPS, but everything we have seen is an effect of time moving forward, I just don't see how it's possible to " go back in time "

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https://m.theepochtimes.com/time-travel-is-possible-how-to-send-a-message-to-the-past_1037968.html

I have this RGB I bought from Laserland It uses 650nm and 445 nm and when i fired it up the green was unplugged and put out the most beautiful pink color. it was beautiful

here is the link
https://www.ebay.com/itm/RGB-300mW-...e=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649

I hope you got another RGB laser sent out or a refund. You really do need the green laser in an RGB laser. You could get that same unit cheaper at LaerLand's website. I think they recently went up in price, but I got one for $46.00.

I plugged the green back in and all works great but that purplish pink color I got out of it when I first powered it up was just awesome then I unplugged the red got a nice cyan . I love that little laser. Do you think they are fairly good quality? it's all aluminum. nice finish. but you know looks can be deceiving

Don't unplug the lasers for the driver. It is not good for either of them. If you want to kill a laser on this unit, just short the two pins on the TTL input for that particular color and it will turn off. That is the safe way to do it.

paul1598419 said:

Don't unplug the lasers for the driver. It is not good for either of them. If you want to kill a laser on this unit, just short the two pins on the TTL input for that particular color and it will turn off. That is the safe way to do it.

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Thanks I didn't know. I don't know much about them OOOH I have another question I have to get a power supply as I ran it off a 12v gelcell battery I have a 13.8v power supply that will fry this as well right? So you think this is a well made laser? Thank you again

It is not the best, by any stretch, but for the price it isn't so bad. If your DC supply is 13.8 volts unloaded, it should work fine as a power source for this laser. Make sure you get the polarity right asd it won't forgive you for that mistake.

I just opened mine just to see the innards (HATE STAR SCREWS) and the top looks like die cast aluminum and the diodes are glued in . I have their 300mw 532 laser and love it. that looks much much better made than this little RGB I also got their 2000mw RGB head is HEAVY and really nicely milled and hope THAT is better made than this little one. but I still love this little laser as it works and has nice color the big one I got is BRIGHT

Yes, a 2 watt RGB will be much brighter than this one. The reason to get lower power ones, is for the divergence specs. Good ones use single mode direct diodes matched to be pretty close in divergence. This 300 mW one used a DPSS laser for green, so the other two can't match its specs well. But, still, for the price you can't beat it.

paul1598419 said:

Yes, a 2 watt RGB will be much brighter than this one. The reason to get lower power ones, is for the divergence specs. Good ones use single mode direct diodes matched to be pretty close in divergence. This 300 mW one used a DPSS laser for green, so the other two can't match its specs well. But, still, for the price you can't beat it.

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Right. and the 2 watt RGB I received from Laserland is real heavy and it is nicely milled and looks MUCH MUCH better made than the little one we're talking about. as per direct diode I don't like my 2 watt 450. the beam is sloppy and it is rectangular. It burns well and it floureses (sp?) many things. but my 300 mw DPSS I got from them is so so much better and almost as bright. being 532 I understand why but the beam quality is so so much better than my Qisc blue laser. I am sure someday they may come out with high power diodes that are great with beam quality who knows. I have a real soft spot for my argons and my DPSS. My blue laser to toally honest bores me just something missing. anyways I hope the quality of my 2 watt laserland RGB is as good as it feels and seems time will tell

You are comparing apples and oranges. The Blue two watt is a multi mode diode with a large emitter. When you focus it, it will take the shape of the emitter. The green DPSS laser is a totally different type of laser that has a round Gaussian beam. It is 532nm in wavelength and that happens to be very close to your visible apex for color. The blue is 445nm to 450nm and is only a fraction as bright at the same power.

paul1598419 said:

You are comparing apples and oranges. The Blue two watt is a multi mode diode with a large emitter. When you focus it, it will take the shape of the emitter. The green DPSS laser is a totally different type of laser that has a round Gaussian beam. It is 532nm in wavelength and that happens to be very close to your visible apex for color. The blue is 445nm to 450nm and is only a fraction as bright at the same power.

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I understand, totally. just the blue one doesn't make me all that excited. It's okay..

Alaskan said:

https://m.theepochtimes.com/time-travel-is-possible-how-to-send-a-message-to-the-past_1037968.html

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Sorry to say it, but this article is pure showmanship. Everything Mr. Mallet is saying is a direct consequence of general relativity. It took him 10 years to finish a general relativity class. Nothing new about circulating objects warping space time. My body also warps space time every second of the day.


Singlemode

I'm hoping the theory works.

From the article:

It’s already been proven in the lab that subatomic particles can be hurled into the future at high speeds. An accelerator has been used on particles known to disintegrate after a certain amount of time. The particles appear in the future, in a young state, without having disintegrated over the usual time period. The particles’ aging slows down as they speed up.

Is this correct ? Maybe it's a mistake, or maybe an effect that looks like something it's not, and how far into the future are we talking about ?

Is this to do with a stream of particles that's going to be there anyway ?

I'm going to look into this, but it sounds wrong as presented, but also let me point out that the observed event is something happening in the future, probably fractions of a second into the future. Velocity time dilatation is real but only going forward, the disappearing into a blur at very high speed, well things moving really fast do look like a blur, and a super high velocity particle would age slower, but that's still not going backwards.

----edit----

They like to take something and extrapolate it to the extreme and call that proof, but we know not all things are liner.

CTC's are only theory, one has never been found to exist.

This experiment I don't see as proof of the wild claims:

http://www.nature.com/articles/ncomms5145

I had to take a look at this since it has gotten some replies. Looks like a blatant ad to ask for donations for a feasibility study into what? A time machine? For someone who spent so long trying to learn general relativity, it looks like a ploy much more than a real possibility.