(As of this date: May 9th, 2016) - This China ebay seller/Techhood has a one watt NDG7475 laser diode from a NUM01 listed for 165.00 USD. Robinson of Techhood has always stood behind his sales for me, although they do make mistakes from time to time but have always been more than willing to make it good for me. I've ordered from him at least (edit: now that I think about it more) twenty times, in my experience perhaps a 5% failure rate on getting the order right but I don't know if that is common for most buyers.
Techhood $165: Nichia NDG7475 520nm 1000mW Green Laser Diode Extracted NUM01 Laser Bank | eBay - Is there an inert gas in this laser diode assembly? What happens if you remove the lens, will oxygen then get to the diode dye to reduce the life?
I also trust this Taiwan seller:
uschen_pvle0ilx7 $180-230: Nichia 1W NDG7475T 520nm 1000mW 9mm Green Laser Diode 1 Piece | eBay - He sold four of them to me at $180 each in that quantity, I don't know if he will continue to sell them that low.
DTR at $220 is always a good choice too and you get delivery ASAP from a U.S. based reputable seller:
DTR-LPF $210-220: 1W 1000mW NDG7475 520nm Laser Diode | eBay
DTR also has a great new 30 X 35mm copper holder for 9mm laser diodes: 35 x 30mm Copper 9mm Laser Diode Mount Blank Module | eBay - Order from DTR through his google shop for better prices: https://sites.google.com/site/dtrlpf/home/diodes (Google Shop $210.00 for the NDG7475).
It wasn't too long ago these one watt 520nm laser diodes which can be pushed to more than 1.3 watts were selling for 1000 dollars each, the price is oh so much better now, only thing is their divergence at more than twice that of a common 532nm DPSS laser pointer causes the light to fan out fairly quickly, so fast you can't see a spot on a 5,000 foot high cloud base without first expanding the beam to at least 3X (better 5X or more), but they operate at low temperature where a 532nm green laser pointer won't operate well, if at all, when too far below room temperature. (DPSS: 808nm/IR diode-pumped solid-state frequency-doubled/DPSSFD).
Note: Compared to a multimode NDG7475 laser diode, for a given beam diameter, a lower power 50mw Osram PL520 single mode 520nm laser diode has far less divergence. If you place a high power pointer with a NDG7475 laser diode in it producing 1000mw of output and a single mode 50mw output PL520 laser diode pointer side by side, both using a 6mm diameter lens, and point at a 5000 foot high cloud base the lower power single mode laser pointer will produce a spot on the cloud deck (if a dark night without bright city lights interfering) and there will no visible spot to the naked eye from the NDG7475, even if 20X higher power because the beam turns into a wide fan at that distance.. It's not that the higher powered multimode laser diode doesn't actually have a spot, just that it has fanned out so wide it is difficult to distinguish. That said, I still like a higher power NDG7475 laser pointer far more due to its close-in brilliance of the beam which is very impressive, just that I use a 10X expander on it to reduce its divergence when trying to put a spot on a high cloud.
The high power 520nm multimode laser diodes are really neat, but their divergence really sucks using a standard 6mm wide collimating lens. Because of this, I expand the output of my NDG7475 laser diode to three inches to reduce it's divergence enough to be able to see a spot on a 10,000 foot high cloud deck (with the naked eye). Warning, if in the USA don't do this if within 10 miles of an airport, or point the spot to within that distance of one or see aircraft ANYWHERE on the horizon or overhead. Why? Even if you are not pointing at an aircraft, if someone perceives you were trying to do so, you can land in jail. I don't know what the law is in other countries, so just referencing the USA airport distances. If I lived near a large airport, I wouldn't feel safe to use a laser outside at all, even 25 miles away from a large international airport, or an area where air traffic is commonly present.
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Techhood $165: Nichia NDG7475 520nm 1000mW Green Laser Diode Extracted NUM01 Laser Bank | eBay - Is there an inert gas in this laser diode assembly? What happens if you remove the lens, will oxygen then get to the diode dye to reduce the life?
I also trust this Taiwan seller:
uschen_pvle0ilx7 $180-230: Nichia 1W NDG7475T 520nm 1000mW 9mm Green Laser Diode 1 Piece | eBay - He sold four of them to me at $180 each in that quantity, I don't know if he will continue to sell them that low.
DTR at $220 is always a good choice too and you get delivery ASAP from a U.S. based reputable seller:
DTR-LPF $210-220: 1W 1000mW NDG7475 520nm Laser Diode | eBay
DTR also has a great new 30 X 35mm copper holder for 9mm laser diodes: 35 x 30mm Copper 9mm Laser Diode Mount Blank Module | eBay - Order from DTR through his google shop for better prices: https://sites.google.com/site/dtrlpf/home/diodes (Google Shop $210.00 for the NDG7475).
It wasn't too long ago these one watt 520nm laser diodes which can be pushed to more than 1.3 watts were selling for 1000 dollars each, the price is oh so much better now, only thing is their divergence at more than twice that of a common 532nm DPSS laser pointer causes the light to fan out fairly quickly, so fast you can't see a spot on a 5,000 foot high cloud base without first expanding the beam to at least 3X (better 5X or more), but they operate at low temperature where a 532nm green laser pointer won't operate well, if at all, when too far below room temperature. (DPSS: 808nm/IR diode-pumped solid-state frequency-doubled/DPSSFD).
Note: Compared to a multimode NDG7475 laser diode, for a given beam diameter, a lower power 50mw Osram PL520 single mode 520nm laser diode has far less divergence. If you place a high power pointer with a NDG7475 laser diode in it producing 1000mw of output and a single mode 50mw output PL520 laser diode pointer side by side, both using a 6mm diameter lens, and point at a 5000 foot high cloud base the lower power single mode laser pointer will produce a spot on the cloud deck (if a dark night without bright city lights interfering) and there will no visible spot to the naked eye from the NDG7475, even if 20X higher power because the beam turns into a wide fan at that distance.. It's not that the higher powered multimode laser diode doesn't actually have a spot, just that it has fanned out so wide it is difficult to distinguish. That said, I still like a higher power NDG7475 laser pointer far more due to its close-in brilliance of the beam which is very impressive, just that I use a 10X expander on it to reduce its divergence when trying to put a spot on a high cloud.
The high power 520nm multimode laser diodes are really neat, but their divergence really sucks using a standard 6mm wide collimating lens. Because of this, I expand the output of my NDG7475 laser diode to three inches to reduce it's divergence enough to be able to see a spot on a 10,000 foot high cloud deck (with the naked eye). Warning, if in the USA don't do this if within 10 miles of an airport, or point the spot to within that distance of one or see aircraft ANYWHERE on the horizon or overhead. Why? Even if you are not pointing at an aircraft, if someone perceives you were trying to do so, you can land in jail. I don't know what the law is in other countries, so just referencing the USA airport distances. If I lived near a large airport, I wouldn't feel safe to use a laser outside at all, even 25 miles away from a large international airport, or an area where air traffic is commonly present.
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