Optical gains as small as 2 × 10−5 are detectable by placing the gain medium inside the cavity of a cw dye laser and operating the laser slightly above threshold to take advantage of moderate spatial hole burning. This technique was used to measure gain on the 40′ → 6″, 7″, and 8″ transitions in optically pumped Br2.
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This is identical to the number of excited iodine molecules.
Ar+ laser power incident on sample cell, A is the beam cross section.
Ar+ laser power absorbed by the iodine.
Sample pressure, T ~ 300 K.
Percentage of dye laser output locked to 43′–11″, I2, B → X fluorescence.
See Refs. 14 and 15.
See Ref. 27.
Net gain
(see Appendix).
Could not operate the dye laser at this wavelength with the sample and pellicle inside the cavity.
Table III
Calculated Gain and Associated Parameters for the I2 System
e is average for even transitions (υ″ = 8,10,12,14), o is average for odd transitions (υ″ = 7,9,11,13,15). Data taken from lines 3–5 of this Table and Table III of Ref. 9.
Ar+–I2 pump laser power absorbed for I2.
Percent of dye laser output locked to 43′−υ″ transition.
I2 pressure inside sample cell, sample at room temperature.
Net gain calculated with Eq. (A5).
Ar+–I2 pumped transition, transition strength data taken from Ref. 29 and FCF from Ref. 30.
Calculated using transition strength data from Fig. 2, Ref. 31, and the FCFs of Ref. 30.
Gain measured by J. B. Koffend and R. W. Field, Ref. 29, in an Ar+ pumped cw I2 laser. I2 cell path length = 50 cm, TEM00 mode volume inside I2 cell = 0.400 cm3.
I2 cell path length = 19 cm, TEM00 mode volume inside I2 cell = 0.037 cm3, dye laser operating at threshold (~0.1 W circulating).
Minimum net gain required to lock 100% of the dye laser to the I2 43−υ″ transition.
Minimum net gain detected without spatial hole burning.
Dye laser operating above threshold (0.2 W circulating).
Tables (3)
Table I
Fractional Lock Is Proportional to the Amount of Pump Radiation Absorbeda
This is identical to the number of excited iodine molecules.
Ar+ laser power incident on sample cell, A is the beam cross section.
Ar+ laser power absorbed by the iodine.
Sample pressure, T ~ 300 K.
Percentage of dye laser output locked to 43′–11″, I2, B → X fluorescence.
See Refs. 14 and 15.
See Ref. 27.
Net gain
(see Appendix).
Could not operate the dye laser at this wavelength with the sample and pellicle inside the cavity.
Table III
Calculated Gain and Associated Parameters for the I2 System
e is average for even transitions (υ″ = 8,10,12,14), o is average for odd transitions (υ″ = 7,9,11,13,15). Data taken from lines 3–5 of this Table and Table III of Ref. 9.
Ar+–I2 pump laser power absorbed for I2.
Percent of dye laser output locked to 43′−υ″ transition.
I2 pressure inside sample cell, sample at room temperature.
Net gain calculated with Eq. (A5).
Ar+–I2 pumped transition, transition strength data taken from Ref. 29 and FCF from Ref. 30.
Calculated using transition strength data from Fig. 2, Ref. 31, and the FCFs of Ref. 30.
Gain measured by J. B. Koffend and R. W. Field, Ref. 29, in an Ar+ pumped cw I2 laser. I2 cell path length = 50 cm, TEM00 mode volume inside I2 cell = 0.400 cm3.
I2 cell path length = 19 cm, TEM00 mode volume inside I2 cell = 0.037 cm3, dye laser operating at threshold (~0.1 W circulating).
Minimum net gain required to lock 100% of the dye laser to the I2 43−υ″ transition.
Minimum net gain detected without spatial hole burning.
Dye laser operating above threshold (0.2 W circulating).