Larry Coldren
From UltrasonicsTo PICs To VCSELS
John Bowers
Fibers!
• Larry has worked in fiber optics for decades…• But he started long, long ago in acoustic fibers…
“Acoustic Cladded Fiber Delay Lines,” G.D. Boyd, L.A. Coldren, and R.N. Thurston
A Long and Illustrious Career…
Amplifiers
•Optical amplifiers part of a key patent on Tunable lasers
•But, Larry started on amplifiers long, long ago…• Not at 200 THz, but at 200 MHz…
First Conference Overlap: 1980
H.C. Tuan, J. E. Bowers, and G. S. Kino, “Theoretical and Experimental Results for Monolithic SAW Memory Correlators,” IEEE Transactions on Sonics and Ultrasonics, 27 (6), 360-369, November 1, 1980
From First to Latest Joint Paper….
T. Komljenovic, R. Helkey, L. Coldren, and J. E. Bowers, “Sparse aperiodic arrays for optical beam forming and LIDAR”, Optics Express, (25)3, 2511-2528, February 6, 2017
J. E. Bowers, L. A. Coldren, B. R. Hemenway, B. I. Miller and R. J. Martin, “1.55 µm Multisection Ridge Lasers,” Electronic Letters, 19 (14), 523-525, July 7, 1983
100 joint papers later
On topics from Lasers, Processing, VCSELs, PICs…
Larry ColdrenLong Wavelength VCSELs
0 5 10 15 20
-18
-12
-6
0
6
12
18
4.43.01.75
1.0
0.7
Freq
uenc
y re
spon
se (d
B)
Frequency (GHz)
0.35
Short Wavelength VCSELs
GaAs
InP
John Bowers
Ring Cavity Tunable LasersSGDBR Tunable Lasers
Si
InP
Larry Coldren John Bowers
Thank you, Larry!