It is not just blue laser pointers that are more expensive. Blue laser modules, OEM lasers and lab lasers are also much more expensive than their green counterparts. The reason for such a large price differences are the processes used to generate the laser beam, the components used that the manufacturing volumes.

Beam generation process

Both blue and green laser pointers use a pump diode that gives out infrared 808nm light that is used to pump the same type of crystals. The pumped crystals in turn give out light in the far infrared spectrum. The difference between blue and green lasers is the optical coatings on the pumped crystals and the type of far infrared light produced by these crystals.

The pumped crystals in a green laser pointer have an optical coating that causes the crystals to give out mostly 1064nm infrared light that is frequency doubled by another crystal to green 532nm light. The pumped crystals in a blue laser pointer have a different coating that causes the crystals to give out mostly 946nm infrared light that is also frequency doubled by another crystal to 473nm light.

The components

The process of producing 1064nm light is much more efficient than making 946nm light so blue laser pointers need a large pump diode to produce the same power. The larger pump diode makes blue laser pointers more expensive. The frequency doubling crystals in blue laser pointers are rarer and more expensive than those in green laser pointers.

Manufacturing volumes

Green laser pointers have better visibility than blue laser pointers and have less temperature problems at higher power levels. This means that green lasers are used for a larger number of diverse applications such as astronomy, pointing, burning and signaling and are manufactured in very high volumes. Blue laser pointers on the other hand are much more limited in their application and are manufactured in much lower volumes. Like any product, the lower the volume produced, the more expensive the product is.

Article is courtesy of Dragonlasers – No 1 lasers, laser pointer and green laser online store

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The free gifts with mobile phones are a relatively new trend. The manufactures offer free gifts to the users with cell phones to increase the sale of their devices. UK based mobile network service providers like Orange, Virgin and Vodafone have come up with many innovative mobile phone deals. Such deals help these network service providers to increase their subscription base.

Free gifts with mobile phones have become so popular that people always look for them before purchasing a new handset. World’s leading manufacturers of mobile phones like Nokia, Samsung and Sony Ericsson have come up with many new models of cell phones in past few years. Some of the highly capable handsets launched by these manufacturers during past few years include Sony Ericssson W850i, Nokia 8800 Sapphire Arte and Samsung U100. Retailers in the UK are offering free gifts like Apple iPod, laptops and XBox 360 Elite gaming console with these handsets.

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