. 2019 Sep 4;10:3985. doi: 10.1038/s41467-019-11898-z

Table 1.

Nonlinear optical coefficients of biological synthesized tellurium

Laser	Sample	T (%)	α₀ (cm⁻¹)	I_sat (GW·cm⁻²)	Imχ⁽³⁾ (×10⁻¹⁴esu)	FOM (×10⁻¹⁵ esu·cm)
515 nm, 340 fs	Bio-Te-PmPV	54.0	6.17	201 ± 35	−1.07 ± 0.11	1.74 ± 0.18
515 nm, 340 fs	Graphene-NMP	46.1	7.74	364 ± 57	−0.67 ± 0.09	0.86 ± 0.11
800 nm, 100 fs	Bio-Te-PmPV	45.0	7.99	261 ± 176	−1.2 ± 0.4	1.47 ± 0.52
800 nm, 100 fs	Graphene-NMP	16.5	18.0	910	−0.968	0.54
1030 nm, 340 fs	Bio-Te-PmPV	52.4	6.47	145 ± 23	−2.76 ± 0.58	4.27 ± 0.91
1030 nm, 340 fs	Graphene-NMP	52.9	6.37	56 ± 11	−5.9 ± 2.1	9.3 ± 3.2
2500 nm, 35 fs	Bio-Te-PMMA	74.2	25.7	220	−20.5	7.99
2500 nm, 35 fs	Graphene-PMMA	75.7	78.9	900	−15.4	1.95
2800 nm, 35 fs	Bio-Te-PMMA	29.6	105	245	−84.1	8.03
2800 nm, 35 fs	Graphene-PMMA	71.2	96.2	–	–	–

Saturable absorption coefficients, I_sat, of Bio-Te and graphene obtained from open-aperture z-scan experiments under various femtosecond laser irradiations, noting that the graphene does not show saturable absorption at 2.8 μm