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  • Sigma-Koki
  • Sigma-Koki
  • Sigma-Koki
 
 
Sigma-Koki
Spectroscopy
Detectors
Visualization (가시화)
LAMP
Laser beamprofilter
Cryogenic
Laser
Sigma-Koki
Fluorescence Life Time
Fiber&probe
 
Sigma-Koki
DLB (Achromatic Doublets (φ10 - φ100)
  • DLB (Achromatic Doublets (φ10 - φ100)
  • Achromatic doublets are cemented achromats made of two different lenses. (Low dispersion positive from crown glass and high dispersion negative from flint glass). The difference of dispersion and shape of both lenses are designed to minimize the chromatic aberrations in blue (486.1nm), green (546.1nm) and red (656.3nm). Therefore, these lenses are able to support the entire visible wavelength spectrum.
Attention

▶When a parallel beam is converged and to minimize the spherical aberration, please set the positive part to the side of the incident parallel beam and put the negative part to the side of the focal point.
▶To change the reflective index of a glass according to a wavelength is called “dispersion of the glass” Having a difference in focal length of a lens at each wave length is Chromatic aberration and this is due to dispersion. This can be corrected by combining glasses with low and high dispersions.
▶ Spherical aberration is when a ray enters a lens farther from its optical axis and has a shorter focus than a paraxial focus.
▶Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.

Common Specifications
MaterialBK7, SF2
Design wavelengthBlue: 486.1nm, Green: 546.1nm, Red: 656.3nm
CoatingBroadband Multilayer Antireflection Coating for the Visible
Bonding of lensesUltraviolet Hardened Adhesive
Laser Damage Threshold0.3J/cm2 
(Laser pulse width 10ns, repetition frequency 20Hz)
Surface Quality (Scratch−Dig)40−20
Clear aperture90% of the diameter

 

주제
 
   
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