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In this video, I show three of my high performance designs for Home made TEA nitrogen Lasers.Although Nitrogen Lasers are quite simple to build, they are difficult to build well. My first ever TEA Laser was held together with gravity and glue. The ones demonstrated here are worlds away from those first attempts!The two Charge Transfer Lasers demonstrated, have high repetition rates, high output powers (peak and average) and are robust, with many thousands of shots possible before the dielectric has to be replaced.These can easily drive a Dye Laser to threshold, in fact the peak power is so high, Dyes can be Lased Superradiantly (Feedback is so high, no mirrors are needed!)
As some of you guys have asked specific questions about the High Performance Nitrogen Laser build, this followup video shows a tear-down of the Nitrogen Laser head, along with specifications for components and general advice if you want to build your own!Also someone asked if the whole system could be run on plain air, and this is demonstrated
In this video, I show a home made tunable dye laser, pumped by a home made Nitrogen Laser.Tuning of the Laser Dye: 7-hydroxy-4-methylcoumarin is demonstrated from violet to green!
In this video, I show a Commercial Dye Laser, the LSI DCM laser I picked up from eBay. This is pumped by my now refurbished LSI 337i Nitrogen Laser.Dye Lasers are really col devices that produce laser light from the Ultraviolet - visible - the Infra-red. They're tunable as well!
How to Make TEA Laser - Homemade/DIY LaserHow to make a TEA laser, an easy to make laser, with step-by-step instructions. A TEA laser is an easy to make homemade/DIY nitrogen laser. TEA stands for Transverse Electrical discharge at atmospheric pressure meaning you use nitrogen in the surrounding air with no control over pressure.
In this episode I discuss Supercontinuum Lasers, the ultimate white light Laser! Normally such lasers cost thousands of dollars, but later on, I discuss constructing one from a practical standpoint, on a super tight budget using plain old telecoms fiber!
Most introductions of laser say that laser is a source of monochromatic light. This video shows polychromatic laser instead.
Quote from: hamdani yusuf on 02/01/2023 12:12:09Most introductions of laser say that laser is a source of monochromatic light. This video shows polychromatic laser instead.How many times have I explained the idea of "lies we tell to children"?
I just found a great Youtube channel named Les' Lab, explaining how to build DIY laser. I'd like to share the videos here. I hope you find them useful.Nitrogen Laser tear down, power up, and Home Made Dye Laser Demonstration
Quote from: hamdani yusuf on 24/12/2022 10:31:11I just found a great Youtube channel named Les' Lab, explaining how to build DIY laser. I'd like to share the videos here. I hope you find them useful.Nitrogen Laser tear down, power up, and Home Made Dye Laser DemonstrationI have just such a parata in the garage, I'm going to try to make this one. Thanks for sharing!
Quote from: Bored chemist on 02/01/2023 19:45:22Quote from: hamdani yusuf on 02/01/2023 12:12:09Most introductions of laser say that laser is a source of monochromatic light. This video shows polychromatic laser instead.How many times have I explained the idea of "lies we tell to children"?Everyone is someone's child. What's the true explanation, free from lies?
Lasers have unique properties - light that is monochromatic, coherent and collimated. But why? and what is the meaning behind he term laser. This video covers are fairly comprehensive explanation of the process of producing a laser beam.
What's the true explanation, free from lies?
How Lasers WorkLasers are everywhere and used in a wide variety of applications. They are found in barcode scanners, DVD players, used in medicine, produce dazzling laser light shows and of course, instrumental in micro manufacturing. A laser is a device which generates or amplifies light. The acronym LASER stands for Light Amplification by Stimulated Emission of Radiation. The term was coined by Gordon Gould when he was a student of Dr. Charles Townes at Columbia University in 1957. Lasers exhibit some unique characteristics. They are monochromatic which is to say they output a single wavelength or pure color with an extremely narrow linewidth. Depending on the laser type, they can have wavelengths from the ultraviolet, visible or infrared portion of the electromagnetic spectrum. Wavelength selection is important depending on the material being laser processed. As an example, UV lasers are best for drilling and cutting plastics. Lasers are highly directional where the beam can be as little as one millimeter and spreads very little over distance. In fact, lasers have been bounced off of the moon to accurately measure the distance from earth. And they are coherent where all the waves are exactly in phase with one another.The common components of all lasers consist of an Active Medium which can be gas such as carbon dioxide or krypton fluoride in an excimer laser to generate high power UV pulses. A solid-state laser has a crystal made of ruby, neodymium-doped yttrium aluminium garnet, or Neodymium-doped yttrium lithium fluoride to name a few. The gain medium can even be a liquid although dye lasers are not used in micromachining. The pumping source or energy input can be electrical such as a HV discharge in excimer lasers or Optical using laser diodes to pump Yag or fiber lasers. Lastly, all lasers need an optical feedback which consists of a mirror or high reflector and a partially reflective mirror, more about that later. A population inversion is critical to sustaining laser operation where a large number of atoms are in an excited state. Looking at the Energy Level Diagram, an electron is pumped to a highly excited state and transitions to a metastable region. The electron will seek its natural or ground state. However, it must release its energy and does so in the form of a photon.Now we have atoms releasing photons in all directions or spontaneous emission. Similar to a blacklight which is a UV pump source and a fluorescent dye. The dye absorbs the UV wavelength and emits a visible color in all directions. In lasers, stimulated emission is achieved by the optical cavity. Photons bounce back and forth between the mirrors. As a photon passes an atom in an excited state, it too emits a photon creating a cascading or domino effect. The output coupler, being partially reflective, permits the laser beam to exit the cavity. The chart shows the laser types commonly used in micromanufacturing. Wavelengths can be anywhere from 193nm to 10.6 microns. Average power is typically in range of a few watts to a few hundred watts. Laser pulse duration can range from microseconds all the way down to femtoseconds which is a millionth of a millionth of a second.
Quote from: hamdani yusuf on 02/01/2023 21:46:16What's the true explanation, free from lies?Complicated.It would probably take a book.Do you now understand why it's not going to be on the web?
In this episode, let's build a Raman Laser!First I talk about some of the background of light scattering, Rayleigh Scattering, Raman Scattering discovered by C.V Raman, then the discovery of the Raman Laser by Gisela Eckhardt.I cover the physical setup from an engineering standpoint.An old Tattoo Laser I refurbished is used to pump a cuvette filled with a Raman Liquid.Although in the early experiments the megawatt Laser energy destroyed the cuvette I was using, I built a Raman cell from scratch, with replaceable windows.Do I manage to shift 532nm green light to 629nm Red? 0:00 Intro0:15 Light Scattering0:47 Rayleigh Scattering1:22 Raman Scattering2:26 Stimulated Raman Scattering SRS3:14 Raman Laser development4:19 Commercial Raman Lasers5:14 Raman Laser Explanation6:39 Intitial Experiment; Laser ate itself!7:16 Raman Laser build7:48 Raman Laser setup9:41 First Light!10:44 Measuring the wavelength11:39 Conclusions and future work
It is on the web already.
Quote from: hamdani yusuf on 05/01/2023 12:03:00It is on the web already.Can you let me know when the bit about supercontinuum lasers is please?
//www.youtube.com/watch?v=w1wSHizmbYgDIY Supercontinuum Laser! The Ultimate White Light Laser!QuoteIn this episode I discuss Supercontinuum Lasers, the ultimate white light Laser! Normally such lasers cost thousands of dollars, but later on, I discuss constructing one from a practical standpoint, on a super tight budget using plain old telecoms fiber!Most introductions of laser say that laser is a source of monochromatic light. This video shows polychromatic laser instead.
Quote from: Bored chemist on 05/01/2023 11:58:37Quote from: hamdani yusuf on 02/01/2023 21:46:16What's the true explanation, free from lies?Complicated.It would probably take a book.Do you now understand why it's not going to be on the web?It is on the web already.Laser Fundamentals I-III | MIT Understanding Lasers and Fiberoptics//www.youtube.com/watch?v=saVE7pMhaxk//www.youtube.com/watch?v=urbZ8CTceu0//www.youtube.com/watch?v=_qixt0NLc9I
Did you deliberately miss the point?When in these videos do they discuss supercontinuum lasers.