8. Laser Radiometry

Day, Gordon W.

doi:10.1016/s1079-4042(05)41008-5

Cited by 2 publications

(7 citation statements)

References 83 publications

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“…We provide three bases on which to view the trend of the measurement noise in figure 11. In figure 11(a), the measurement standard deviation is plotted against the power on the force sensor and relates to the η N amplification-dependent term in (6). In figure 11(b), this same noise is plotted against the laser power on the beam dump, labeled '(d)' in figure 5(i), and relates to the η P input power-dependent term in (6).…”

Section: Noise Trendsmentioning

confidence: 99%

“…In figure 11(a), the measurement standard deviation is plotted against the power on the force sensor and relates to the η N amplification-dependent term in (6). In figure 11(b), this same noise is plotted against the laser power on the beam dump, labeled '(d)' in figure 5(i), and relates to the η P input power-dependent term in (6). Figure 11(c) is similar to figure 11(b) in that it also relates to η P ; however, here the measurement noise is plotted against the calculated laser intensity on the beam dump, where differences in beam size at the beam dump between the one-reflection and 14-reflection cases are accounted for by the differences in laser propagation length in these two setups and the laser divergence angle.…”

Section: Noise Trendsmentioning

confidence: 99%

“…Thermal approaches equate incident optical power to the heat generated by the absorbed light. Their range encompasses powers from the single photon level [3] to over 100 kW continuous wave (CW) [4][5][6]. The lowest measurement uncertainty for optical power is achieved with a thermal technique implementing a cryogenic radiometer for an expanded relative uncertainty of 0.0052% [7].…”

Section: Introductionmentioning

confidence: 99%

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High amplification laser-pressure optic enables ultra-low uncertainty measurements of optical laser power at kilowatt levels

Artusio‐Glimpse

Rogers²,

Williams³

et al. 2021

Metrologia

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We present the first measurements of kilowatt laser power with an uncertainty less than 1%. These represent progress toward the most accurate measurements of laser power above 1 kW at 1070 nm wavelength and establish a more precise link between force metrology and laser power metrology. Radiation pressure, or photon momentum, is a relatively new method of non-destructively measuring laser power. We demonstrate how a multiple reflection optical system amplifies the pressure of a kilowatt class laser incoherently to improve the signal to noise ratio in a radiation pressure-based measurement. With 14 incoherent reflections of the laser, we measure a total uncertainty of 0.26% for an input power of 10 kW and 0.46% for an input power of 1 kW at the 95% confidence level. These measurements of absolute power are traceable to the SI kilogram and mark a state-of-the-art improvement in measurement precision by a factor of four.

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Section: Noise Trendsmentioning

confidence: 99%

Section: Noise Trendsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

High amplification laser-pressure optic enables ultra-low uncertainty measurements of optical laser power at kilowatt levels

Artusio‐Glimpse

Rogers²,

Williams³

et al. 2021

Metrologia

View full text Add to dashboard Cite

show abstract

“…In figure 11(a), the measurement standard deviation is plotted against the power on the force sensor and relates to the η N amplification-dependent term in (6). In figure 11(b), this same noise is plotted against the laser power on the beam dump, labeled "d." in figure 5(i.), and relates to the η P input power-dependent term in (6). Figure 11(c) is similar to figure 11(b) in that it also relates to η P ; however, here the measurement noise is plotted against the calculated laser intensity on the beam dump, where differences in beam size at the beam dump between the 1-reflection and 14-reflection cases are accounted for by the differences in laser propagation length in these two setups and the laser divergence angle.…”

Section: Noise Trendsmentioning

confidence: 99%

“…laser power on the force balance relating to η N in (6), (b.) laser power on beam dump relating to η P in(6), and (c.) laser intensity on beam dump also relating to η P in(6), where A B is the area of the laser in the plane of the beam dump.…”

mentioning

confidence: 99%

High amplification laser-pressure optic enables ultra-low uncertainty measurements at kilowatts

Artusio-Glimpse,

Rogers,

Williams

et al. 2021

Preprint

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We present the first measurements of kilowatt laser power with an uncertainty less than 1 %. These represent progress toward the most accurate measurements of laser power above 1 kW at 1070 nm wavelength and establish a more precise link between force metrology and laser power metrology. Radiation pressure, or photon momentum, is a relatively new method of non-destructively measuring laser power. We demonstrate how a multiple reflection optical system amplifies the pressure of a kilowatt class laser incoherently to improve the signal to noise ratio in a radiation pressure-based measurement. With 14 incoherent reflections of the laser, we measure a total uncertainty of 0.26 % for an input power of 10 kW and 0.46 % for an input power of 1 kW at the 95 % confidence level. These measurements of absolute power are traceable to the SI kilogram and mark a state-of-the-art improvement in measurement precision by a factor of four.

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8. Laser Radiometry

Cited by 2 publications

References 83 publications

High amplification laser-pressure optic enables ultra-low uncertainty measurements of optical laser power at kilowatt levels

High amplification laser-pressure optic enables ultra-low uncertainty measurements of optical laser power at kilowatt levels

High amplification laser-pressure optic enables ultra-low uncertainty measurements at kilowatts

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