displays a laser oscillation spectrum of an AC’7 crystal. The structural formula of
AC’7 is shown in Fig. 9.8 together with other related organic semiconductors. Once
we choose an empirical formula of the wavelength dispersion [e.g., (9.101)], we can
determine constants of that empirical formula by comparing it with experimentally
decided data. For such data, laser oscillation spectra (Fig. 9.7) were used in addition
to the broadband emission spectra. It is because the laser oscillation spectra are
essentially identical to Fig. 9.6 in a sense that both the broadband and laser emission
lines gave the same free spectral range. Inserting (9.101) into (9.100) and expressing
n g as a function of λ, Yamao et al. got a following expression [6]:
500 520 540 560 580 600 620 640
0
5
10
Wavelength (nm)
(a)
(b)
529
530
531
9
10
11
Wavelength (nm)
Intensity (10
3
counts)
Intensity (10
3
counts)
Fig. 9.6 Broadband emission spectra of an organic semiconductor crystal AC’7. (a) Full spectrum.
(b) Enlarged profile of the spectrum around 530 nm. Reproduced from Yamao T, Okuda Y,
Makino Y, Hotta S (2011) Dispersion of the refractive indices of thiophene/phenylene co-oligomer
single crystals. J Appl Phys 110(5): 053113/7 pages [6], with the permission of AIP Publishing.
https://doi.org/10.1063/1.3634117
522
524
526
528
0
1
2
3
4
Wavelength (nm)
Intensity (10 3
counts)
Fig. 9.7 Laser oscillation spectrum of an organic semiconductor crystal AC’7. Reproduced from
Yamao T, Okuda Y, Makino Y, Hotta S (2011) Dispersion of the refractive indices of thiophene/
phenylene co-oligomer single crystals. J Appl Phys 110(5): 053113/7 pages [6], with the permission
of AIP Publishing. https://doi.org/10.1063/1.3634117
360
9 Light Quanta: Radiation and Absorption
AC’7 is shown in Fig. 9.8 together with other related organic semiconductors. Once
we choose an empirical formula of the wavelength dispersion [e.g., (9.101)], we can
determine constants of that empirical formula by comparing it with experimentally
decided data. For such data, laser oscillation spectra (Fig. 9.7) were used in addition
to the broadband emission spectra. It is because the laser oscillation spectra are
essentially identical to Fig. 9.6 in a sense that both the broadband and laser emission
lines gave the same free spectral range. Inserting (9.101) into (9.100) and expressing
n g as a function of λ, Yamao et al. got a following expression [6]:
500 520 540 560 580 600 620 640
0
5
10
Wavelength (nm)
(a)
(b)
529
530
531
9
10
11
Wavelength (nm)
Intensity (10
3
counts)
Intensity (10
3
counts)
Fig. 9.6 Broadband emission spectra of an organic semiconductor crystal AC’7. (a) Full spectrum.
(b) Enlarged profile of the spectrum around 530 nm. Reproduced from Yamao T, Okuda Y,
Makino Y, Hotta S (2011) Dispersion of the refractive indices of thiophene/phenylene co-oligomer
single crystals. J Appl Phys 110(5): 053113/7 pages [6], with the permission of AIP Publishing.
https://doi.org/10.1063/1.3634117
522
524
526
528
0
1
2
3
4
Wavelength (nm)
Intensity (10 3
counts)
Fig. 9.7 Laser oscillation spectrum of an organic semiconductor crystal AC’7. Reproduced from
Yamao T, Okuda Y, Makino Y, Hotta S (2011) Dispersion of the refractive indices of thiophene/
phenylene co-oligomer single crystals. J Appl Phys 110(5): 053113/7 pages [6], with the permission
of AIP Publishing. https://doi.org/10.1063/1.3634117
360
9 Light Quanta: Radiation and Absorption