Acoustic resonance laser calorimetry for measurements of low optical absorption

2020 ◽  
Vol 59 (28) ◽  
pp. 8733
Author(s):  
Aleksey V. Konyashkin ◽  
Aleksey A. Molkov ◽  
Oleg A. Ryabushkin
Keyword(s):  
Optical Absorption ◽  
Acoustic Resonance ◽  
Resonance Laser ◽  
Laser Calorimetry

Measurement of the absorption coefficient of a periodically poled LiNbO3 crystal at a radiation wavelength of 3 μm

2021 ◽  
Author(s):  
A.Yu. Ostapiv ◽  
I.V. Larionov ◽  
A.V. Konyashkin ◽  
O.A. Ryabushkin
Keyword(s):  
Optical Absorption ◽  
Absorption Coefficient ◽  
Nonlinear Optical ◽  
Optical Absorption Coefficient ◽  
Radiation Wavelength ◽  
Periodically Poled ◽  
Piezoelectric Resonance ◽  
Ppln Crystal ◽  
Resonance Laser ◽  
Laser Calorimetry

Problem formulating. In the case of nonlinear-optical conversion of high-power laser radiation in nonlinear-optical crystals the optical absorption leads to a nonuniform heating of the crystals, which results in the violation of phase matching conditions, the formation of defects, and optical damage. Goal. Measurements of optical absorption coefficient of the periodically poled lithium niobate (PPLN) crystal at 3 μm radiation wavelength using the piezoelectric resonance laser calorimetry (PRLC). Result. The optical absorption coefficient of PPLN crystal at 3.045 μm radiation wavelength was measured using the piezoelectric resonance laser calorimetry. The value (1.15±0.15) 10⋅ -2cm-1 of absorption coefficient within the measurement error limits was independent of the initial temperature of PPLN and the incident radiation power in the ranges 293–343 K and 0.2–10 W respectively. Practical meaning. The interaction of mid-IR laser radiation with PPLN crystal was studied using the piezoelectric resonance laser calorimetry.

Piezoelectric resonance laser calorimetry for an optical testing of crystal boules

2018 ◽  
Author(s):  
G.A. Aloian ◽  
N.V. Kovalenko ◽  
I.V. Shebarshina ◽  
A.V. Konyashkin ◽  
O.A. Ryabushkin
Keyword(s):  
Optical Testing ◽  
Piezoelectric Resonance ◽  
Resonance Laser ◽  
Laser Calorimetry

Piezoelectric Resonance Laser Calorimetry for Optical Absorptance Testing of Crystal Boules

2018 ◽  
Author(s):  
Georgii Aloian ◽  
Nikita Kovalenko ◽  
Irina Shebarshina ◽  
Aleksey Konyashkin ◽  
Oleg Ryabushkin
Keyword(s):  
Piezoelectric Resonance ◽  
Resonance Laser ◽  
Laser Calorimetry

Optical absorption spectrum of PMMA via laser calorimetry

1983 ◽  
Vol 21 (4) ◽  
pp. 647-655 ◽  
Author(s):  
P. Avakian ◽  
W. Y. Hsu ◽  
P. Meakin ◽  
H. L. Snyder
Keyword(s):  
Absorption Spectrum ◽  
Optical Absorption ◽  
Optical Absorption Spectrum ◽  
Laser Calorimetry

Optical absorption in polymer glasses by laser calorimetry

1980 ◽  
Vol 51 (2) ◽  
pp. 1160-1162 ◽  
Author(s):  
B. Crist ◽  
M. E. Marhic ◽  
G. Raviv ◽  
M. Epstein
Keyword(s):  
Optical Absorption ◽  
Polymer Glasses ◽  
Laser Calorimetry

Assessment of Tongue Position and Laryngeal Height in Two Professional Voice Populations

2020 ◽  
Vol 63 (1) ◽  
pp. 109-124
Author(s):  
Carly Jo Hosbach-Cannon ◽  
Soren Y. Lowell ◽  
Raymond H. Colton ◽  
Richard T. Kelley ◽  
Xue Bao
Keyword(s):  
Vocal Fold ◽  
Vocal Tract ◽  
Current Knowledge ◽  
Acoustic Resonance ◽  
Contact Dynamics ◽  
Voice Disorder ◽  
Music Program ◽  
Tongue Position ◽  
Singer Groups ◽  
Professional Voice

Purpose To advance our current knowledge of singer physiology by using ultrasonography in combination with acoustic measures to compare physiological differences between musical theater (MT) and opera (OP) singers under controlled phonation conditions. Primary objectives addressed in this study were (a) to determine if differences in hyolaryngeal and vocal fold contact dynamics occur between two professional voice populations (MT and OP) during singing tasks and (b) to determine if differences occur between MT and OP singers in oral configuration and associated acoustic resonance during singing tasks. Method Twenty-one singers (10 MT and 11 OP) were included. All participants were currently enrolled in a music program. Experimental procedures consisted of sustained phonation on the vowels /i/ and /ɑ/ during both a low-pitch task and a high-pitch task. Measures of hyolaryngeal elevation, tongue height, and tongue advancement were assessed using ultrasonography. Vocal fold contact dynamics were measured using electroglottography. Simultaneous acoustic recordings were obtained during all ultrasonography procedures for analysis of the first two formant frequencies. Results Significant oral configuration differences, reflected by measures of tongue height and tongue advancement, were seen between groups. Measures of acoustic resonance also showed significant differences between groups during specific tasks. Both singer groups significantly raised their hyoid position when singing high-pitched vowels, but hyoid elevation was not statistically different between groups. Likewise, vocal fold contact dynamics did not significantly differentiate the two singer groups. Conclusions These findings suggest that, under controlled phonation conditions, MT singers alter their oral configuration and achieve differing resultant formants as compared with OP singers. Because singers are at a high risk of developing a voice disorder, understanding how these two groups of singers adjust their vocal tract configuration during their specific singing genre may help to identify risky vocal behavior and provide a basis for prevention of voice disorders.

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