Del Mar Photonics - Featured customer Seung-Woo Kim from KAIST, South Korea
Recent publication in INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING Vol. 8, No.4, pp.22-26, 22 OCTOBER 2007
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: swk@kaist.ac.kr, 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 × 10–10, 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
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
Avoca SPIDER
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