A diode-pumped channel waveguide laser fabricated in Nd: phosphate glass Page: 4 of 7
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pump source, with a pump wavelength of 806.5 nm. At this wavelength, the pump absorption
coefficient is 3.3 cm-1 leading to an estimated 93% pump absorption efficiency. Fig. 1 shows the slope
efficiency for a 50 x 9 m2 channel with a 62% output coupler reflectivity. The slope efficiencies
obtained are 14.6% and 14.1% for TE and TM polarized pump beams, respectively; the difference
between the two being minor.
Nd:IOG-1 channel waveguide laser
TE Pump, diamonds,
solid line fit
TM Pump, cir
dashed line f
'f 'f f 'f '
0 50 100 150 200 250
Incident Pump Power (mW)
Fig. 1. Slope efficiencies of 50 x 9 pm2 channel waveguide laser.
Knowledge of the amount of loss in the laser cavity is essential in understanding the performance
of the laser. One standard method of measuring loss in a four level laser is the Findlay-Clay 
analysis, where the threshold power is measured as a function of varying output coupling. Three output
coupler reflectivities of 97%, 82%, and 62% were used in the experiment. The losses measured for the
50 jm channel with this analysis are 0.28 - 0.39 dB/cm (Loss [dB/cm] = Loss/4.34 [1/cm]). The
measured losses in the 29 um channel were much higher, from 0.58 - 1.12 dB/cm. No lasing was
observed with lower reflectivity mirrors.
Another method to measure loss was reported by Caird, et. al. , where inverse slope
efficiencies are plotted as a function of inverse output coupling (Fig. 2). Starting from
Ts =ro T+
one can invert the above equation to obtain
1 S 1 1
r1s rlo T rlo
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Patel, F D; Honea, E C; Krol, D; Payne, S A & Hayden, J. A diode-pumped channel waveguide laser fabricated in Nd: phosphate glass, article, January 29, 1999; California. (digital.library.unt.edu/ark:/67531/metadc620032/m1/4/: accessed November 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.