Most diode lasers in the market (including toptica) are not wavelength stabilized. In case of a shift in peak wavelength, the SPDC photons falls out of the 810+/-5nm filter range which reduces the brightness of the entangled source. Is there any better laser with fixed central wavelength and reasonably narrow linewidth?
Topica has really good lasers for such applications, but they are also fairly expensive: http://www.toptica.com/products/industrial_oem_diode_lasers/single_frequency/topmode.html
I would advice against CNILaser [http://www.cnilaser.com/blue_laser405.htm]. We've bought their laser for SPDC, and it never really worked due to stability issues.
Hi
You can take a look at www.eagleyard.com DFB laser but they are more expensive and sensitve with 2 MHz bandwidth and 1nm tuning range.
Hi,
Another option is buying a laser diode from Sacher:
http://www.sacher-laser.com/home/scientific-lasers/tunable_lasers/littrow/tec-100-tec_120_littrow_laser_system_lynx.html
We've used one of their lasers for SPDC and it performed well.
Assaf
It really depends on what you are trying to do with the SPDC photons. We have a down-conversion setup in a teaching lab that uses a $3 30 mW laser pointer at 405 nm. Yes, this is scary since the pointer is listed as
Alexander, Sami, Assaf,
are not those lasers too sophisticated (and expensive) for most SPDC experiments? Of course, you need stable temperature and stable current, but not a very narrow bandwidth (1 nm can be enough) nor any kind of tuning.
Carlos
Carlos Montero-Orille,
can you give the vendor name for 30 mW, 405 nm lasers.
Santosh babu Gunda If you need laser module, go for Toptica. If you need laser diode, Ondax ( now a part of coherent ) is the only one with narrow linewidth. If you dont care about the linewidth, there are many high power freerunning laser diodes available (even from thorlab) .
Chithrabhanu Perumangatt Thanks. Am looking for some low cost alternatives. We will use them in teaching labs. Lasers from Aixiz.com were used in by Mark Beck, Reed College. Am looking for similar firms which can supply.
If you dont need high coherence, you can buy the laser diodes which are very cheap. It comes with an effective linewidth of 0.5nm. You might need to get the driving electronics for that. Making one using arduino can be a fun project for students.