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Spectral Lenses

Fore Lenses

VNIR 400 - 1000nm ; SWIR 900 - 2500 nm

The objective lens used in front of the imaging spectrograph is a crucial component in the system design and operation. Firstly it must provide a high quality image and secondly it must also transmit light across the full spectral range of the spectrograph or spectral camera being used.

Each lens can be locked in position to ensure focus is maintained even in harsh environments. Mechanical stability is guaranteed for the best stability in optical imaging and spectroscopy measurements.

Each lens is optimised for its spectral range and is fully multi-layer anti-reflection coated for the best transmission quality across the spectral range with minimum stray light and glare.

UV LENS SET: 200 TO 400 nm
SPECIFICATIONS  OLE 9   OLE 18.5   OLE 23   OLE 14  UNIT
Focal Length 9 18.5 23 140 mm
F-Number 2.4 2.4 2.4 2.8  
Spatial Image Size  14.4   12.4   14.4   12.4 mm
Spectral Range Multi-layer AR coated: 200 to 400 nm
Optical Output Telecentric  
Transmission Efficiency > 85% over the spectral range  
Minimum Working Distance 0.5 10 m

 

VNIR 200 - 400 nm
  • OL series from 200 - 400nm
  • Focal lengths: 9, 18.5, 23 and 140mm
  • Spatial image size max. 14.4mm
VNIR LENS SET: 400 TO 1000 μm
SPECIFICATIONS OLE 9 OLE 18.5 OLE 23 OLE 140 UNIT
Focal Length 9 18.5 23 140 mm
F-Number 2.4 2.4 2.4 2.8  
Spatial Image Size 14.4 12.4 14.4 12.4 mm
Spectral Range Multi-layer AR coated: 400 to 1000 nm
Optical Output Telecentric  
Transmission Efficiency > 85% over the spectral range  
Minimum Working Distance 0.5 10 m

 

VNIR 400 - 1000 nm
  • OL series from 400 - 1000nm
  • Focal lengths: 8, 12, 17, 23 and 35mm
  • Spatial image size max. 12mm

 

  • OLE series from 400 - 1000nm
  • Focal lengths: 9, 18.5, 23 and 140mm
  • Spatial image size max. 14.3mm
NIR/SWIR: 900 TO 2500μm
OPTICAL CHARACTERISTICS OLES15 OLES43 OLES30 OLES56 OLESMACRO UNIT
Focal Length 15 22.5 30.7 56 73.3 mm
F-Number 2.1 2.0 2.0 2.0 4.0  
Spatial image size (max) 9.6 12.8 12.8 9.6 10.0 mm
Spectral Range Corrected for the full 900 – 2500 nm range
Multilayer AR- coated for 900 – 2500 
nm
Optical Output Telecentric  
RMS Spot diameter 10.1 17.6 16.8 12.9 25.4 µm
Transmission > 82% over the spectral range %
Minimum Working Distance 500cm (30cm) cm
MECHANICAL CHARACTERISTICS  
Dimensions (L) 60 x diam. 45 (L) 48.5 x diam. 47 (L) 41.6 x diam. 53 (L) 84 x diam. 53 (L) 173 x diam. 46 mm
Body Stainless Steel /anonized aluminium  
Mount Custom Mount  

 

SWIR 900 - 2500 nm
  • OLES series from 900 - 2500 nm
  • Foca lengths 15, 22.5, 30.7 and 56mm, Macro for 1:1 imaging
  • Spatial image size max. 12.8mm
MWIR: 30 TO 5um AND LWIR: 8 TO 12 μm
SPECIFICATIONS OLEM23 OLEM43 OLEL43 OLEL63 UNIT
Focal Length 23 43 43 63 mm
F-Number 3.0 3.8 3.8 2.5  
Spatial Image Size 19.5 18.3 18.4 33.5 mm
Spectral Range Multi-Layer AR coated: 3 to 5 Multi-Layer coated AR-coated: 8 to 12 um
Transmission Efficiency > 94, over the spectral range %
Minimum working Distance 50 cm

 

MWIR 3 - 5 μm
  • OLEM series from 3 - 5um
  • Focal lengths: 23 and 43 mm
  • Spatial image size max. 13.4mm
LWIR 8 - 12 μm
  • OLEL series from 8 to 12um
  • Focal lengths: 43 and 62 mm
  • Spatial image size max. 12.4 mm
Spectral Lenses
 

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Contact us

Gilden Photonics Ltd.
Unit 13 Telford Court
9 South Avenue
Clydebank Business Park
Glasgow G81 2NR
UK

tel: +44 (0)141 952 9475
fax: +44 (0)141 952 9400
sales@gildenphotonics.com