L21_A
Lesson 6: FROG and SPIDER & Free Talk
Lesson 6: FROG and SPIDER & Free Talk
6-3 Spectral interferometry (SI)
Schematic of SI
Examples: Gaussian pulses
Phase retrieval algorithm
L21_B
Lesson 6: FROG and SPIDER & Free Talk
6-3 Spectral interferometry (SI)
Application: Dispersion measurement
Example: 500‐μm‐thick SiO2
6-4 Spectral phase interferometry for
direct E‐field reconstruction (SPIDER)
Basic idea
Challenges
L21_C
Lesson 6: FROG and SPIDER & Free Talk
6-4 Spectral phase interferometry for
direct E‐field reconstruction (SPIDER)
Challenges
SPIDER setup
How does SPIDER overcome the challenges
Issue 1: Delay and spectral shear coupling
Issue 2: Need high‐resolution
L21_D
Lesson 6: FROG and SPIDER & Free Talk
6-4 Spectral phase interferometry for
direct E‐field reconstruction (SPIDER)
Issues 3: Need precise delay calibration
Free Talk: FROG Algorithms
Iterative FT algorithm
Example: Single‐peak pulse
Example: Double‐peak pulse
What is generalized projection (GP)
