1. Date of download: 9/17/2016 Copyright © 2016 SPIE. All rights reserved. The temperature distributions of the front face and the y-z plane at different illuminated positions of the VBG: (a) δ=0.6 mm, Tmax=33.52°C; (b) δ=0 mm, Tmax=30.07°C; and (c) δ=−0.6 mm, Tmax=27.20°C. Unit: °C. Figure Legend: From: Investigation on the thermal properties of volume Bragg grating in laser diodes with external cavities Opt. Eng. 2016;55(8):086112. doi:10.1117/1.OE.55.8.086112

2. Date of download: 9/17/2016 Copyright © 2016 SPIE. All rights reserved. The temperature distributions of the front face of the VBG in the three temperature-controlled types: (a) one temperature-controlled face (surface A); (b) three temperature-controlled faces (surfaces A, B, and D); and (c) four temperature-controlled faces (surfaces A, B, C, and D). Unit: °C. Figure Legend: From: Investigation on the thermal properties of volume Bragg grating in laser diodes with external cavities Opt. Eng. 2016;55(8):086112. doi:10.1117/1.OE.55.8.086112

3. Date of download: 9/17/2016 Copyright © 2016 SPIE. All rights reserved. The temperature distributions of the front face of the bulk VBG in the 5-bar LD stack external cavity: (a) the LD power is 100 W; and (b) the LD power is 200 W. Unit: °C. Figure Legend: From: Investigation on the thermal properties of volume Bragg grating in laser diodes with external cavities Opt. Eng. 2016;55(8):086112. doi:10.1117/1.OE.55.8.086112

4. Date of download: 9/17/2016 Copyright © 2016 SPIE. All rights reserved. The temperature distributions of the front face at different setting temperatures of the VBG: (a) 40°C; (b) 80°C; (c) 120°C; and (d) 160°C. Unit: °C. Figure Legend: From: Investigation on the thermal properties of volume Bragg grating in laser diodes with external cavities Opt. Eng. 2016;55(8):086112. doi:10.1117/1.OE.55.8.086112

5. Date of download: 9/17/2016 Copyright © 2016 SPIE. All rights reserved. The temperature distributions of the surface F and y-z plane at heat convention coefficient of 25 W and setting temperature of 160°C. Unit: °C. Figure Legend: From: Investigation on the thermal properties of volume Bragg grating in laser diodes with external cavities Opt. Eng. 2016;55(8):086112. doi:10.1117/1.OE.55.8.086112

6. Date of download: 9/17/2016 Copyright © 2016 SPIE. All rights reserved. The temperature distributions of the front face of the bulk VBG: (a) one temperature-controlled faces; and (b) four temperature- controlled faces. Unit: °C. Figure Legend: From: Investigation on the thermal properties of volume Bragg grating in laser diodes with external cavities Opt. Eng. 2016;55(8):086112. doi:10.1117/1.OE.55.8.086112

7. Date of download: 9/17/2016 Copyright © 2016 SPIE. All rights reserved. The relative temperature distributions in the x-axis at different setting temperatures of the VBG: inverted triangle: 40°C; asterisks: 80°C; plus: 120°C; and dot: 160°C. Figure Legend: From: Investigation on the thermal properties of volume Bragg grating in laser diodes with external cavities Opt. Eng. 2016;55(8):086112. doi:10.1117/1.OE.55.8.086112

8. Date of download: 9/17/2016 Copyright © 2016 SPIE. All rights reserved. General description of the models: (a) side view; (b) transversal view; and (c) three-dimensional view. N is the bar number of the vertical stack; and surfaces A, B, C, D, E, and F refer to the bottom, right side, top, left side, back, and front facet of the VBG, respectively. Figure Legend: From: Investigation on the thermal properties of volume Bragg grating in laser diodes with external cavities Opt. Eng. 2016;55(8):086112. doi:10.1117/1.OE.55.8.086112

9. Date of download: 9/17/2016 Copyright © 2016 SPIE. All rights reserved. The temperature distributions of the front face at different LD powers and heat convention coefficient of 25 W/(m2 °C): (a) 100 W; (b) 200 W; (c) 300 W; and (d) 400 W. Unit: °C. Figure Legend: From: Investigation on the thermal properties of volume Bragg grating in laser diodes with external cavities Opt. Eng. 2016;55(8):086112. doi:10.1117/1.OE.55.8.086112