Hi -jeet,
VCSEL= Vertical Cavity Surface Emitting Laser.
Usually needs relative smaller Current & the most positive data: Profile of the light-ray is equivalent with the "Top Electrode" from Chip.
This is usually a circle, the convergence is practically optimal too(has very strong parallel light & needs no collimation...)
Please check it (for example):
http://www.opticsinfobase.org/abstract.cfm?uri=ol-32-19-2831
http://en.wikipedia.org/wiki/Vertical-cavity_surface-emitting_laser
**broken link removed**
In Europe are the best (research)sources:
CSEM, OSRAM, Uni Ulm, ETH Zürich, Uni Stuttgart; Uni Chemnitz...
What is your application please?
If you tell "I have LED to pulse-drive with 60MHz"; it means for me=fiber driving or spectrometry & comes the question:
You must have really yellow light , or can be infrared to?...
You can by (today) VCSEL from ca. 700 nm up to ca. 4-5um.
K.
Added after 47 minutes:
Hi,
You can check that too:
www.analog.com/static/imported-files/application_notes/AN_634.pdf
This has relative good/perfect controlling/stabilization, but my be you dont need to build so precise circuits?
Than you can take a simple High-Speed AC-MOS gate!
)
They has up to +/-24 mA driving capability and if you need more current, you can coppel it more time parallel and its packages are smallest SMD...
www.fairchildsemi.com/ds/NC/NC7WZ17.pdf
I soluted a project ca. 9 years ago with some similar type from Toshiba, & TI for 40MHz Clks, there worked over 8 years in very special field....
If you have power (or current) problems is important to know, Laser-diodes need usually up to 100-200 mAmps_ in opposite VCSEL at 5-20mAmps & LEDs at 50+/_20mAmps- or so...
K.