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| Lumenis Laser ROD Head ND:YAG Diameter: 8mm Length: 110mm 1064 nm | |
 | $150.00 Time Remaining: 2h 2m |
| Nd:YAG LASER ROD 42mm x 3.5mm Neodymium flash lamp pumped dpss optics ruby diode | |
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| ERBIUM LASER ROD neodymium yag ruby infrared ir solid state | |
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| 5 x 60mm NEODYMIUM YAG LASER ROD for SSY-1 HEAD Nd:YAG 1064nm infrared optics | |
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| Lumenis Laser ROD Head ND:YAG Diameter: 6.35mm / 0.25" Length: 105mm 1064 nm | |
 | $150.00 Time Remaining: 2h 2m |
| Scratched High Power DPSS ND:YAG Laser Rod 106mm 6mm | |
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| Nd:YAG SLAB BREWSTER CUT LASER ROD TIR-FPL neodymium yag optics optical optic | |
 | $75.00 Time Remaining: 29d 11h 52m Buy It Now for only: $75.00 |
| Nd:YAG Rod for Diode Pumped DPSS Laser 1.2mm x 22.4mm | |
 | $39.00 (1 Bid) Time Remaining: 2d 5h 33m |
| Scratched High Power DPSS CTH:YAG Laser Rod 13cm 4mm | |
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| High Power DPSS ND:YAG Laser Rod 11cm 8mm | |
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Yag Laser Rod
Is the wavelength(color) of solid laser determined by the gain medium, the flash lamp, or anything else?
If it is determined by the gain medium, which type of laser rods should I choose in order to produce a visible light? But I find most laser rods such as Nd:YAG don't have parameters about the wavelength.
If it is not determined by the gian medium, what else should I do to produce a visible light?
Thanks very much~
The gain medium is the critical component of a laser which determines its colour. The flash lamp just supplies energy, and its wavelength is not critical.
You need to choose laser rods which will produce wavelengths in the visible spectrum, from about 390 to 750 nm. Red is around 600nm, green is about 500nm while blue is 400nm.
Alternatively use infra-red wavelengths >1000nm, coupled with diode frequency doubling or tripling circuits to produce visible light.
For example, the Nd:YAG rods you mention give an IR wavelength of about 1064nm. Frequency doubling will produce a visible green laser with 532nm wavelength.
| No items matching your keywords were found. |
|
| Lumenis Laser ROD Head ND:YAG Diameter: 8mm Length: 110mm 1064 nm | |
| $150.00 Time Remaining: 2h 2m |
| Nd:YAG LASER ROD 42mm x 3.5mm Neodymium flash lamp pumped dpss optics ruby diode | |
| $29.00 Time Remaining: 29d 11h 52m Buy It Now for only: $29.00 |
| ERBIUM LASER ROD neodymium yag ruby infrared ir solid state | |
| $39.95 Time Remaining: 29d 11h 52m Buy It Now for only: $39.95 |
| 5 x 60mm NEODYMIUM YAG LASER ROD for SSY-1 HEAD Nd:YAG 1064nm infrared optics | |
| $49.00 Time Remaining: 29d 11h 52m Buy It Now for only: $49.00 |
| Lumenis Laser ROD Head ND:YAG Diameter: 6.35mm / 0.25" Length: 105mm 1064 nm | |
| $150.00 Time Remaining: 2h 2m |
| Scratched High Power DPSS ND:YAG Laser Rod 106mm 6mm | |
| $85.00 Time Remaining: 20d 21h 44m Buy It Now for only: $85.00 |
| Nd:YAG SLAB BREWSTER CUT LASER ROD TIR-FPL neodymium yag optics optical optic | |
| $75.00 Time Remaining: 29d 11h 52m Buy It Now for only: $75.00 |
| Nd:YAG Rod for Diode Pumped DPSS Laser 1.2mm x 22.4mm | |
| $39.00 (1 Bid) Time Remaining: 2d 5h 33m |
| Scratched High Power DPSS CTH:YAG Laser Rod 13cm 4mm | |
| $69.90 Time Remaining: 26d 22h 47m Buy It Now for only: $69.90 |
| High Power DPSS ND:YAG Laser Rod 11cm 8mm | |
| $159.90 Time Remaining: 20d 21h 58m Buy It Now for only: $159.90 |
| No items matching your keywords were found. |
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| Lumenis Laser ROD Head ND:YAG Diameter: 8mm Length: 110mm 1064 nm | |
| $150.00 Time Remaining: 2h 2m |
| ERBIUM LASER ROD neodymium yag ruby infrared ir solid state | |
| $39.95 Time Remaining: 29d 11h 52m Buy It Now for only: $39.95 |
| Nd:YAG LASER ROD 42mm x 3.5mm Neodymium flash lamp pumped dpss optics ruby diode | |
| $29.00 Time Remaining: 29d 11h 52m Buy It Now for only: $29.00 |
| 5 x 60mm NEODYMIUM YAG LASER ROD for SSY-1 HEAD Nd:YAG 1064nm infrared optics | |
| $49.00 Time Remaining: 29d 11h 52m Buy It Now for only: $49.00 |
| Lumenis Laser ROD Head ND:YAG Diameter: 6.35mm / 0.25" Length: 105mm 1064 nm | |
| $150.00 Time Remaining: 2h 2m |
| Scratched High Power DPSS ND:YAG Laser Rod 106mm 6mm | |
| $85.00 Time Remaining: 20d 21h 44m Buy It Now for only: $85.00 |
| Nd:YAG SLAB BREWSTER CUT LASER ROD TIR-FPL neodymium yag optics optical optic | |
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| Scratched High Power DPSS CTH:YAG Laser Rod 13cm 4mm | |
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| Nd:YAG Rod for Diode Pumped DPSS Laser 1.2mm x 22.4mm | |
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| | Yag Training Vessels $68.51 High Quality Content by WIKIPEDIA articles YAG (Yard Auxiliary, General) training vessels are wooden boats built between 1954 and 1958, and based at CFB Esquimalt in Esquimalt, British Columbia, Canada. The vessels are used for training Canadian Forces regular naval officers, naval reservists, and members of the Royal Canadian Sea Cadets in basic seamanship, vessel handling, and navigation. According to the Department of National Defence, in 2000, a total of 1830 personnel were deployed on the YAGs for a total of 585 days and steamed over 25,000 nautical miles (46,000 km) in support of training. YAGs displace 70 tonnes, and are divided into five major belowdecks compartments: right forward, a chain locker, then the forward cabin, containing the galley, one of the heads (washrooms) and the officers eating and sleeping areas, as well as the gyroscopic (gyro) compass. Author: Surhone, Lambert M./ Timpledon, Miriam T./ Marseken, Susan F. Binding Type: Paperback Number of Pages: 80 Publication Date: 2010/07/05 Language: English Dimensions: 5.98 x 9.01 x 0.19 inches |
| | Laser Bonding $71.7 Laser bonding is a marking technique that uses lasers and other forms of radiant energy to bond an additive marking substance to a wide range of substrates. Invented in 1997, this patent protected technology delivers permanent marks on metals, glass and ceramic parts for a diverse range of industrial and manual applications, ranging from aerospace to the awards engraving industries. It differs from the more widely known techniques of laser engraving and laser ablation in that it is an additive process, adding material to the substrate to form the marking instead of removing it as in those techniques. For metals, parts can be permanently marked with high contrast, high resolution marks for logos, barcoding, identification and serialization purposes, without damage to the substrate. With glass and ceramics, complex surfaces can be decorated or marked and the traditional firing process replaced by a laser, with its permanent bond fired on in seconds. Laser bonding has been achieved by Nd:YAG, CO2 laser, Fiber laser and Diodepumped solidstate laser and can be made by other forms of radiant energy. Laser bonding is often referred to as CerMark, CerMarked, or CerMarking Author: Miller, Frederic P./ Vandome, Agnes F./ McBrewster, John Binding Type: Paperback Number of Pages: 92 Publication Date: 2010/04/23 Language: English Dimensions: 9.02 x 5.98 x 0.22 inches |
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| | Laser Desorption from a Room Temperature Ionic Liquid. $115.71 We report laser desorption from a Room Temperature Ionic Liquid (RTIL) as a novel source for time of flight mass spectrometry. We use the 2nd harmonic of an Nd: YAG laser to deposit intensities of 150 MW/cm2 via backside illumination onto our RTIL desorption sample. A microstructured metal grid situated on top of a glass microscope slide coated with RTIL serves as our desorption sample. The RTIL we use, 1Butyl, 3Methylimidazolium Hexafluorophosphate, remains liquid at pressures below 108 torr. The use of liquid desorption sample allows for improved surface conditions, homogeneity and sample life as compared to Matrix Assisted Laser Desorption Ionization (MALDI) techniques. Our desorption technique is also unique as it allows the study of both multiphoton and acoustic desorption processes within the same time of flight spectra. Our technique yields intrinsically high resolution, low noise data. We observe differences between ion species in their preference for desorption by a particular desorption method. Specifically, we observe desorption solely by acoustic means of an entire RTIL molecule adducted with an RTIL cation. Finally, we report the applicability of this technique for the desorption of biomolecules Author: Harris, Peter Ronald Binding Type: Paperback Number of Pages: 112 Publication Date: 2011/09/11 Language: English Dimensions: 9.69 x 7.44 x 0.23 inches |
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Understanding Synthetic And Imitation Gemstones
Laboratory-created stones, or synthetic gemstones, as the name implies, are made in a laboratory. Synthetic gemstones do not have the rarity of naturally colored stones and they are less expensive than naturally mined stones. Because of the way they are made, synthetic gems may show subtle differences in shape and colour that help lo distinguish them from their natural counterparts. A synthetic gemstone is identical to a natural gemstone in almost every way. This includes the same basic crystal structure, refractive index, specific gravity, chemical composition, colors, and other characteristics. Since the same gemological tests are used for stone identification on both natural and synthetic gems, it is sometimes even possible for a gemologist to be puzzled as to whether or not a stone is natural or synthetic. Such stones can be made colourless, or, by the use of metallic oxides, in many colours, and thus can be made to resemble many natural stones, including the Amethyst, diamond, spinel, emerald, Opal and corundum (ruby and sapphire). Alexandrite.
Lapis lazuli, turquoise, and coral produced by the French manufacturer, Gilson, are similar to their natural counterparts, but are not true synthetics because their optical and physical properties differ from the natural gems. Gilson lapis lazuli, for example, is more porous and has a lower specific gravity.
Methods of making Synthetic gemstones
Growth from Melt:
* The Flame Fusion or Verneuil Process
Originally developed (1902) by a French chemist, Auguste Verneuil, the process produces a boule (a mass of alumina with the same physical and chemical characteristics as corundum) from finely ground alumina (Al2O3) by means of an inverted oxyhydrogen torch that opens into a ceramic muffle. With slight modifications, this method is used to produce spinel, rutile, and strontium titanate.
In Verneuil method for making rubies, a rod with a “seed crystal” is lowered into melted minerals and then brought back up. Repeating this process over and over grows a large crystal on the end of a rod from the melted minerals. The ruby can then be detached and cut and polished.
* Pulling or Czochralski's Technique
A method of growing synthetic crystal by high-melting point devised by Polish scientist Jan Czochralski, who discovered the method in 1916 while investigating the crystallization rates of metals. Czochralski and is named as Czochralski pulling technique. Where a seed crystal is gently lowered until it is in contrast with pure melt in the crucible and it is then pulled slowly upwards. The product shows rod-like single crystals. Used to make rare-earth garnets, lithium niobate, synthetic scheelite, and synthetic alexandrite.
* Brigman-Stockbarger Technique
The method involves heating polycrystalline material in a container above its melting point and slowly cooling it from one end where a seed crystal is located. Single crystal material is progressively formed along the length of the container. The process can be carried out in a horizontal or vertical geometry.
Growth from Solution:
* Hydrothermal Method
Aquamarine and Quartz crystals are grown in a solution in autoclaves, where temperature and pressure are controlled to create the feed material called lascas in the hotter portion. Seed crystals are in the cooler portion upon which the lascas redeposits, forming synthetic quartz. This process can take 30 to 60 days, and is also used to grow amethyst, citrine, or rock crystal.
* Flux Melt Method
Pioneered by the French chemist Edmond Fremy, the flux-melt technique is still used to make emeralds. The powdered ingredients are melted and fused in a solvent (flux) in a crucible. The material must be kept at a very high temperature for months, before being left to cool very slowly.
* High Temperature/Pressure Method:
One type of solution growth from water at high temperatures and pressure is known as the hydrothermal technique. Growth from solution is achieved by an increase in saturation. Like adding increasing amounts of sugar to water, the sugar will dissolve until the solution is saturated and can absorb no more and then it will begin to re-crystallize. With cooling, crystallization will increase and with heating it will decrease. A seed crystal is often employed to initiate the crystallization and to provide a point for the deposition to begin. Crystal growth rates are a function of time, temperature, and concentration. Hydrothermal techniques are used to make emeralds, quartz, rock crystal and amethyst.
* Skull Melting Process
This process was perfected in USSR specifically for crystallizing synthetic cubic zirconia, for uses in optical, electronic and laser equipment. Cubic zirconium oxide has a very high melting point and is a very reactive material. No container can hold this melt since cubic zirconia has a melting point of 2750°C, and hence a cold crucible or skull is used.
Imitation stones can be made up of any substance, like glass, paste or strass, faience, porcelain, acrylic, and plastics. Ceramics are the most common and least expensive simulants and they are used as substitutes for many kinds of popular gem materials like turquoise, coral, jade, pearls. Imitation stones are made to simulate a particular gemstone, but they do not have the same chemical, physical, and optical properties of the natural gemstone like the synthetic gemstone and hence can be easily distinguished from synthetic and natural gemstones. Volcanic glass, a man-made substance from obsidian and volcanic ash, is a possible candidate for imitation aquamarine and pale sapphire. Some examples of imitation stones are cubic zirconia, Synthetic Moissanite (Diamond) , and yttrium aluminum garnet which are diamond simulants. Since diamonds are so valuable and popular, the market for diamond impostors is huge, and many additional simulants like cubic zirconia, GGG, YAG, strontium titanate, synthetic rutile, and moissanite have been created over the last 50 years. Other imitation stones are Emerald Doublet, Foil Glass (Opal), Imitation Lapis Lazuli, Synthetic Forsterite (Tanzanite), Synthetic Forsterite (Peridot).
read more about Natural, Organic, Synthetic and Imitation gemstones
About the Author
__________________________
Iris Dcosta
www.valuablestones.com
laser is simply a beam of focused light that extends on for infinite distance if in a vaccum.