Electro-Optics - Applied Optics Fundamentals and Device Applications - page 71

3 10 -3

2 10 -3

2 10 -3

FWHM-0.8 nm

1 10 -3

5 10 -4

0 10

964 966 968 970 972 974

Wavelength (nm)

FIGURE 2.44
Emission spectrum of a 5 mm × 5 mm VCSEL array at 100 W output power (120 A). (Courtesy of
Princeton Optronics [PO] and Dr. Chuni Ghosh. With permission.)

FIGURE 2.45
Far-field beam profile of a 5 mm × 5 mm VCSEL array at 100 W output power (120 A). (Courtesy
of Princeton Optronics [PO] and Dr. Chuni Ghosh. With permission.)

been a tremendous advantage for low-power VCSELs in the telecom
and datacom markets because of their ability to directly couple to
fibers (“butt-coupling”) with high coupling efficiency. PO high-power
VCSEL arrays emit in a quasi-top-hat beam profile, making these
devices ideal for direct pumping (“butt-pumping”) of solid-state lasers.