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Absolute Distance Measurements Using the Optical Comb of a Femtosecond Pulse Laser

Jonghan Jin1, Young-Jin Kim1, Yunseok Kim1 and Seung-Woo Kim 1, #
1 Billionth Uncertainty Precision Engineering Group, Korea Advanced Institute of Science and Technology, 373-1 Guseong-Dong, Yuseong-Gu, Daejeon, South Korea, 305-701
# Corresponding Author / E-mail:, TEL: +82-42-869-3217, FAX: +82-42-869-5217
KEYWORDS: Interferometry, Distance, Calibration

We describe a new way of implementing absolute displacement measurements by exploiting the optical comb of a
femtosecond pulse laser as a wavelength ruler. The optical comb is stabilized by locking both the repetition rate
and the carrier offset frequency to an Rb clock of frequency standard. Multiwavelength interferometry is then
performed using the quasi-monochromatic beams of well-defined generated wavelengths by tuning an external
cavity laser diode consecutively to preselected light modes of the optical comb. This scheme of wavelength
synthesizing allows the measurement of absolute distances with a high precision that is traceable to the definition
of time. The achievable wavelength uncertainty is 1.9 × 1010, which allows the absolute heights of gauge blocks to
be determined with an overall calibration uncertainty of 15 nm (k = 1). These results demonstrate a successful
industrial application of an optical frequency synthesis employing a femtosecond laser, a technique that offers
many possibilities for performing precision  length metrology that is traceable to the well-defined international
definition of time.

Researches used femtosecond Ti:Sapphire laser Trestles 50

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Femtosecond products from Del Mar Photonics:

Femtosecond Lasers

Trestles femtosecond Ti:Sapphire laser
Trestles Finesse femtosecond Ti:Sapphire laser with integrated DPSS pump laser
Teahupoo Rider femtosecond amplified Ti:Sapphire laser
Mavericks femtosecond Cr:Forsterite laser
Tamarack femtosecond fiber laser (Er-doped fiber)
Buccaneer femtosecond OA fiber laser (Er-doped fiber) and SHG
Cannon Ultra-broadband light source
Tourmaline femtosecond Yb-doped fiber laser
Chata femtosecond Cr:ZnSe laser (2.5 micron) coming soon

Femtosecond pulse measurement instrumentation

Reef scanning and single shot femtosecond autocorrelators
Spectral phase interferometry for direct electric-field reconstruction (SPIDER)
Rincon third order femtosecond cross-correlator (third order autocorrelator TOAC) also referred to as contrastmeter

Ultrafast Dynamics Research Tools

Beacon femtosecond fluorescence up-conversion (optical gating) spectrometer
Hatteras Ultrafast Transient Absorption Spectrometer

High Power Femtosecond Laser Systems

Cortes 800 tabletop 40 TW Ti:Sapphire laser system
Cortes E  - High vacuum laser ablation/deposition system with 2 TW Ti:Sapphire laser
Cortes K - femtosecond seed laser for Petawatt KrF excimer laser
Cortes O 200TW femtosecond laser - KD*P CPOPA based amplifier system
Jaws femtosecond Cr:forsterite Multi-Terawatt Amplified Laser
High-vacuum system for laser ablation/deposition

Femtosecond Systems and Accessories

Femtosecond Micromachining
Femtosecond nanophotonics
Femtosecond NSOM
Pacifica femtosecond fiber laser based terahertz spectrometer
Pismo pulse picker (ultrafast electro-optical shutter)
Wavelength conversion: second and third harmonics generators for femtosecond lasers
Jibe white light continuum generator
Kirra Optical Faraday Rotators and Isolators
Deformable mirrors - active elements for adaptive optics systems
ShaH - the family of fast, accurate and reliable wavefront sensors
Complete adaptive optics systems
Faraday rotators and isolators for high-power (up to 1kW) laser beams
SAM - Saturable Absorber Mirrors
PCA - Photoconductive antenna for terahertz applications
Passive Q-switches based on Co2+:ZnS, Cr2+:ZnS and Cr2+:ZnSe
Lithium Niobate Q-switches
Lithium Tantalate Q-switches