Varifocal Lens
KTN Innovative Optics: Elecro-optically activated. Best for bio-related fast laser microscopies.
*The top micrographs are two-photon images of C. elegans, kindly provided by Prof. Junichi Nakai and Dr. Keiko Gengyo-Ando, currently at Tohoku University. GFP was expressed in all neurons. Both microscope images are captured in two different imagining depths.
Benefits
Ultra-fast
The focal-length can be shifted in a micro second by controlling the voltage to KTN crystal, which is 100 times faster than those of conventional varifocal lenses.
Focusing mechanism: Concept diagram
The focal-length shift performance
KTN Varifocal lens works as a convex lens and the focal-length is varied in proportion to the square o the supplied voltage.The typical result of the lens power using the practical permittivity is 1.0 m−1 when 1 kV is applied.*
*Quoted from APPLIED OPTICS Vol. 51, No. 10 1 April 2012、APEX-4-022501.
Voltage vs Focal Point Shift Δf
Time response
Specifications
Lens power | 0 - 0.5m-1 |
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Response frequency | DC - 10kHz |
Wavelength | 488nm - 3500nm |
Beam radius | 3 mmφ |
Size | 97 mm x 85 mm x 32 mm |
Custom-designed KTN VariFocal lenses are available.
Please feel free to contact us.
3D microscopy setup (possible application)
Application examples
- Biological microscopes, e.g., supporting nanometer-level resolution 3D living cell analysesa),b)
b) Jasmin K. Pape, Till Stephan, Francisco Balzarotti, Rebecca Büchner, Felix Lange, Dietmar Riedel, Stefan Jakobs and Stefan W. Hell, “Multicolor 3D MINFLUX nanoscopy of mitochondrial MICOS proteins”, Proc. Natl. Acad. Sci. USA, published August 11, 2020.
- Laser processing
- 3D measurement (combined with KTN scanner)
Custom-designed KTN VariFocal lenses are available.
Please feel free to contact us.
Please feel free to contact us.
Related Link
- News Release(January 31,2013)
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For the high power laser application:
Please click here to find the damage threshold data with CW lasers.(Courtesy of University of Twente and University of Erlangen)