Kaiser Optical Systems
Home About Us Products News Trade Shows Careers Contact Us


Raman Spectroscopy

Imaging Spectrographs
HoloSpec ƒ/1.8i
Holographic Imaging Spectrograph

The HoloSpec™ ƒ/1.8i holographic imaging spectrograph includes an integrated pre-filter section and provides extremely high throughput. The aperture ratio of ƒ/1.8 provides five- to twenty-times greater collection angle than spectrographs operating at ƒ/4 to ƒ/8.

The HoloSpec™ ƒ/1.8i is the ideal spectrograph for Raman spectroscopy and other laser spectroscopy applications. It includes a state-of-the-art holographic SuperNotch-Plus™ filter, which attenuates Rayleigh scatter by over six orders of magnitude, allows collection of data at Stokes shifts as low as 50 cm-1, and allows simultaneous collection of both Stokes and anti-Stokes data.

  • Award Winning Design
  • High Throughput
  • Unsurpassed Imaging
  • Holographic Notch Filter
  • Excellent Stability
  • Volume Transmission Grating


The HoloSpec™ holographic imaging spectrograph is based on Kaiser's award-winning axial transmissive spectrograph configuration. This configuration is based on holographic optical elements (HOEs) that are the result of a decade of development of HOEs for high-performance military applications.

In the axial transmissive spectrograph, the volume-phase holographic (VPH™) transmission grating replaces the Czerny-Turner spectrograph's surface-relief reflection grating as the dispersive element, and axially symmetric, multi-element lenses replace the off-axis, typically toroidal mirrors as the collimating and focusing elements. The VPH grating, recorded in dichromated gelatin, achieves high diffraction efficiency (typically 80% for unpolarized light) and high spatial frequency, while allowing a 90° fold angle, coupled with short-focal-length lenses. This results in a compact spectrograph with linear dispersion similar to that typically achieved with 1/4- to 1/2-meter Czerny-Turner spectrographs. The imaging design allows for multichannel or line imaging applications with no modification to the basic spectrograph.

Key Advantages of HoloSpec™ Spectrograph over Czerny-Turner Spectrographs

The axial-transmissive design of the HoloSpec spectrograph results in the following advantages over traditional Czerny-Turner spectrographs:

High Spatial Resolution
The optics employed in the HoloSpec™ spectrograph achieve thorough aberration correction across a large field along both the slit axis and the wavelength axis. This feature makes the HoloSpec spectrograph ideal for applications involving one-dimensional spectral imaging or simultaneous monitoring of many different spectra.

Unsurpassed Image Quality

HoloSpec™ ƒ/1.8i

Image Data graphically illustrating the superior image quality acheivable by the HoloSpec ƒ/1.8i over the entire area of a commonly used CCD camera.



Typical 0.25 m Czerny-Turner Spectrograph

Graphs are image cross-sections of a 250 line/inch Ronchi ruling taken at the edge of a 26 mm x 6.7 mm CCD having 23 micron pixels, illuminated at 543.5 nm.

High Throughput
The HoloSpec™ spectrograph operate at aperture ratios as fast as ƒ/1.8, providing several times the light throughput of even the fastest Czerny-Turner spectrographs.

Compact
The footprint of the HoloSpec™ spectrograph is less than one-half or one-quarter that of typical quarter-meter or half-meter Czerny-Turner spectrographs.

Robust
The axial-transmissive configuration of the HoloSpec spectrograph, which uses no moving optics, provides a robust package with stable calibration ideal for process environments. The HoloSpec™ spectrograph is mountable in any orientation.

Easy to Use
The HoloSpec™ spectrograph include adjustments controlling focus and camera tilt, and mounts designed to facilitate switching among different input sources, gratings, and slits.

Spectral Range
The HoloSpec™ spectrograph can operate over the spectral range 425-nm to 900-nm when equipped with the appropriate gratings.

Gratings for Different Spectral Coverage
Gratings to provide spectral windows with widths of 75 to 400 nm on a 26-nm detector are available. Gratings are provided on pre-aligned base plates that can be easily exchanged.

HoloSpec™ Accessories

Various accessories are available for the HoloSpec™ spectrograph, including:

  • Entrance Slits
    Kaiser offers the following fixed width slits for the HoloSpec™. Slits are easily exchanged using a quick exchange mount .
Model Number
Slit Width
(microns unless otherwise indicated)
SLIT-25
SLIT-50
SLIT-83
SLIT-100
SLIT-167
SLIT-250
SLIT-416
SLIT-500
SLIT-833
SLIT-1000
SLIT-1670
SLIT-2000
SLIT-4000
25
50
83
100
167
250
416
500
833
1000
1670
2000
4000


Model Number
Spectral Coverage (nm)
Linear Dispersion (nm/pixel)
HFG-539.5
HFG-550
HFG-600
HFG-650
HFG-730.8
HFG-750
HVG-590
411.4 to 667.6
419.4 to 680.6
457.4 to 742.4
495.7. to 804.3
557.3 to 904.3
571.9 to 928.1
384.5 to 795.5
0.26
0.26
0.29
0.31
0.35
0.36
0.42

 

Excitation Wavelength
Stokes/Anti-Stokes Grating
Low-Frequency Stokes Grating
High-Frequency Stokes Grating


514.5
 

HSG-514.5-SA
-1054 to 1577 cm-1
2.7 cm-1/pixel

HSG-514.5-LF
-204 to 2317 cm-1
2.6 cm-1/pixel

HSG-514.5-HF
2290 to 4491 cm-1
2.2 cm-1/pixel

532

HSG-532-SA
-980 to 1559cm-1
2.6 cm-1/pixel

HSG-532-LF
-29 to 2388 cm-1
2.4 cm-1/pixel

HSG-532-HF
2265 to 4387 cm-1
2.1 cm-1/pixel


632.8
 

HSG-632.8-SA
-1150 to 1026 cm-1
2.2 cm-1/pixel

HSG-632.8-LF
-2 to 2027 cm-1
2.1 cm-1/pixel

HSG-632.8-HF
1958 to 3735 cm-1
1.8 cm-1/pixel


647
 

HSG-647-SA
-983 to 1127 cm-1
2.1 cm-1/pixel

HSG-647-LF
-33 to 1955 cm-1
2.0 cm-1/pixel

HSG-647-HF
1877 to 3620 cm-1
1.8 cm-1/pixel

752

HSG-752-SA
-984 to 1173 cm-1
2.2 cm-1/pixel

HSG-752-LF
-34 to 1979 cm-1
2.0 cm-1/pixel

HSG-752-HF
1901 to 3622 cm-1
1.7 cm-1/pixel

785

HSG-785-SA
-1000 to 1072 cm-1
2.1 cm-1/pixel

HSG-785-LF
-34 to 1894 cm-1
2.0 cm-1/pixel

HSG-785-HF
1901 to 3622 cm-1
1.7 cm-1/pixel

830

HSG-830-SA
-980 to 987 cm-1
2.0 cm-1/pixel

HSG-830-LF
14 to 1831 cm-1
1.8 cm-1/pixel

HSG-830-HF
1752 to 3306 cm-1
1.6 cm-1/pixel

 

  • High Dispersion Gratings
    Kaiser Manufactures High Dispersion Gratings(HDGs) for Raman and plasma applications. A single HDG can cover up to 1000 cm-1 using 532 nm excitation and a 1024 x 256 (26 micron pixel) CCD chip. Coverage is exciation wavelength dependant and each grating is specific for a single excitation wavelength. A 532 nm HDG yields 1000 cm-1 of spectral coverage. At 785 nm HDG grating yields 700 cm-1 of spectral coverage. The center wavelength of the HDG may be selected by the cutomer. The customer can specify either the center wavelength of the HDG grating or the approximate spectral coverage. Contact us directly regarding custom High Dispersion Gratings to meet your requirements.

  • Various input adapters
    Kaiser offers a number of standard input adapters.
Model Number
Description
HS-FOI-FC
FC Fiber Optic Adapter
HS-FOI-SMA
SMA Fiber Optic Adapter
LFAI-10
Linear Fiber Array Adapter
0.397"/10mm
LFAI-12
Linear Fiber Array Adapter
0.475"/12mm
LFAI-12.7
Linear Fiber Array Adapter
0.502"/12.7mm
HS-FOI-Blank
Blank adapter that you can modify to your own requirements

 

 

Home  •  About Us  •  Products  •  Media Room  •  Trade Shows  •  Careers  •  Contact Us  •  Sitemap
©2017 Kaiser Optical Systems, Inc., All Rights Reserved.   Legal Notice