Abstract

We fabricated silver iodide (AgI)-coated silver hollow waveguides to transmit a wide range of infrared (IR) light. Silver-clad stainless steel pipes were used as a supporting pipe. Since this type of metallic hollow waveguide has high mechanical strength and heat resistance, it is suitable as a rigid lightwave probe for various applications such as dental or medical laser treatment, IR spectroscopy, thermal radiometry, and laser processing. Considering these applications, we estimated the hollow waveguides with different thicknesses of the AgI layer. By optimizing the AgI layer thickness according to the wavelength of propagating light, we succeeded in efficiently transmitting Er-YAG and CO2 laser light. We also studied the optical characteristics of a wide range of incoherent light for IR spectroscopy and radiometry applications using these metallic hollow waveguides as lightwave probes.

© 2012 Optical Society of America

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Figures (12)

Fig. 1.
Fig. 1.

Applications of metallic hollow waveguides for infrared (IR) lightwave transmission.

Fig. 2.
Fig. 2.

Cross sectional photograph of AgI-coated silver-clad stainless steel waveguide.

Fig. 3.
Fig. 3.

Theoretical transmission losses of HE 11 mode as function of inner AgI layer thickness for Er-YAG and Colorado 2 laser light transmission.

Fig. 4.
Fig. 4.

Theoretical transmission losses of HE 11 mode as function of wavelength when AgI thickness is optimum for Er-YAG and Colorado 2 laser light transmission: (a) AgI thickness is 0.24 μm, optimum thickness for Er-YAG laser light transmission, and (b) AgI thickness is 0.94 μm, optimum thickness for Colorado 2 laser light transmission.

Fig. 5.
Fig. 5.

Transmittances of Er-YAG laser light and Colorado 2 laser light through straight and bent waveguides with different AgI thicknesses: (a) Er-YAG laser light transmission and (b)  Colorado 2 laser light transmission.

Fig. 6.
Fig. 6.

Transmission loss spectra of straight waveguides with different AgI thicknesses.

Fig. 7.
Fig. 7.

Experimental setup for IR spectroscopy applications using two bent waveguides.

Fig. 8.
Fig. 8.

Transmission loss spectra of metallic hollow probes used for IR spectroscopy.

Fig. 9.
Fig. 9.

Photograph of metallic hollow probes used for temperature measurement.

Fig. 10.
Fig. 10.

Transmission loss spectra of the probes used for temperature measurement.

Fig. 11.
Fig. 11.

Experimental arrangement for temperature measurement using metallic hollow probe: (a) Block diagram and (b) Photograph of measurement setup.

Fig. 12.
Fig. 12.

Output voltage from amplifier circuit as function of control temperature of blackbody heat source.

Equations (3)

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α = 1 2 ( λ 2 π ) 2 u 0 2 T 3 n n 2 + k 2 [ 1 + a 2 ( a 2 1 ) 1 / 2 ] 2 ,
J p 1 ( u 0 ) = 0 for HE p q modes .
λ p = 6.93 d + 0.146.

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