1. (Frequency-resolved optical-gating)
FROG
(Frequency-resolved optical-gating)

2. FROG 방법 Polarization Gate (PG FROG) Self-Diffraction (SD FROG)
(D.J.Kane and R.Trebino Opt. Lett. 18, )
Self-Diffraction (SD FROG)
(D.J.Kane and R.Trebino IEEE J.Quntum Electron. 29, )
SHG FROG
(K.W.DeLong, R.Trebino, and W.E.White J.Opt.Soc.Am.B 11, )

3. PG FROG *Rhodamine6G dye laser ~620nm <100fs pulses at ~100MHz
Imaging
Spectrometer
(chromex fF250)
CCD
Camera
Gate pulse
(45 degree polarization)
Probe pulse E(t)
Cylindrical lens
Nonlinear medium(3mm BK7)
Imaging lens
(images line focus of beams at nonlinear medium onto slit of spectrometer)
*Rhodamine6G dye laser ~620nm <100fs pulses at ~100MHz
And a 10Hz Nd:YAG-pumped dye amplifier ~300fs ,~200
*beam splitting yielded two pulses, of and
*10cm focal-length quartz cylindrical.
*A spherical lens imaged the signal beam onto the slit of a
¼-m chromex imaging spectrometer.
*two-dimensional array photometrics CCD camera

4. Chirp pulse
Linear chirp pulse
Positive chirp
negative chirp

5. * The measured signal IFROG or FROG trace
* Signal pulse electric field
* The measured signal IFROG or FROG trace
*The FORG trace can be considered a spectrogram of the E(t)

6. PG FROG

7. Two-dimensional phase-retrieval problem

8. Iterative-Fourier transform algorithm
(k+1)st iteration for E(t)

9. Instantaneous frequency
Linear chirp Phase
Instantaneous frequency
Derived intensity and phase
Experimental FROG trace for a linearly chirped pulse

10. Intensity Autocorrelation

11. FROG 는 Intensity I(t) 와 Phase 를 측정할 수 있다. FROG Setting을 쉽게 할 수 있다.결론
FROG 는 Intensity I(t) 와 Phase 를 측정할 수 있다.
FROG Setting을 쉽게 할 수 있다.
Reference
R.Trebino and D.J.Kane J.Opt.Soc.Am.A 10,
D.J.Kane and R.Trebino Opt. Lett. 18,
Ultrashort Laser pulse Phenomena J.C.Diels and W Rudolph. (1996)

12. Intensity autocorrelation