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The laser diode is the basic part for modules and pointers.  There are all kinds of laser diodes with different wavelength and power. The prices are for wholesale only. Contact us by if you need them.

1) Nichia 200mW 405nm Laser Diode, NDV4542, made in Japan, 39USD . More details here about NDV4542
2) 405nm 350mW CW 150mW laser diode, 35USD/pcs, Sony SLD3237VFR Pomax 350mW . 
3) SONY 20mW 405nm laser diode, SLD3134VL, laser LD with PD, 8.8USD/pcs

1) 50mW 440nm/450nm OSRAM PLT4NSB , 49USD/pcs
2) 450nm 445nm 1W laser diode with low price and high quality.

1) sanyo 70mW LD DL-7147-201B, 8.9USD/pcs
2) Panasonic Pomax 340mW 660nm/780nm dual-wavelength ceramic laser diode, 4.8USD/pcs

1) ROHM 10mW 780nm laser diode, 0.79USD/pcs 

1) C-mount Package 500mW, 9.8USD/pcs
2) T056(9MM) 808nm 500mW laser diode, 18.7 USD/pcs

Laser Diode Driver

The 2W laser diode is a laser diode ( laser LD, laser LED) with 2000mW 2W output power. Normally the output power is from 1600mW - 2400mW. There are many brands for these 2w laser diode, such as : Sony,SANYO,Mitsubishi,OSRAM, Nichia,ROHM, and the most popular is Nichia NDB7875-E 9mm 2w blue laser diode. BeamQ sells most of the 2w laser diodes, you can find them here. However if you want to get 2w laser diode from eBay, you will find that many of them are 2w laser modules , not diodes.  

A laser diode is a laser where the active medium is a semiconductor, similar to that found in a light-emitting diode. The most common laser diode is formed from a p-n junction. It's powered by injected electric current. The former devices are sometimes referred to as injection laser diodes, to distinguish them from optically pumped laser diodes.

Double heterostructure lasers,a layer of low bandgap material is sandwiched between two high bandgap layers.
Quantum well lasers,the middle layer is made thin enough, it acts as a quantum well.
Quantum cascade lasers,the difference between quantum well energy levels is used for the laser transition instead of the bandgap. Separate confinement heterostructure lasers,To compensate, another two layers are added on, outside the first three.

Distributed feedback lasers,DFB are the most common transmitter type in DWDM-systems.
VCSELs,Vertical-cavity surface-emitting lasers (VCSELs) have the optical cavity axis along the direction of current flow rather than perpendicular to the current flow as in conventional laser diodes.
VECSELs,In VCSELs, the mirrors are typically grown epitaxially as part of the diode structure, or grown separately and bonded directly to the semiconductor containing the active region.
External-cavity diode lasers,External-cavity diode lasers are tunable lasers which use mainly double heterostructures diodes of the AlxGa(1-x)As type.

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