ASP-75. Compact Multipurpose Spectrometer

The smallest model of the ASP family has small footprint and weight while maintaining optimal spectral resolution for many research applications.
Optical specifications
Optical scheme Czerny-Turner
Spectral range for choosing the registration domain*, nm 190-1100 190-1100 190-1100 190-1100 190-800 190-450 190-300
Grating, grooves/mm 400 600 800 1200 1800 1800
Registered spectrum region width*(1), nm 950 600 385 245 150 69 40
Spectral resolution*, nm 1 0.65 0.5 0.3 0.18 0.085 0.05
Dispersion, nm/mm 28 18 13.5 8.5 5.2 2.4 1.4
Input slit 10 µm
Focal length 46 mm
Focal length of the camera objective 75 mm
Input type(2) free-space and SMA905 fiber socket (FC socket and fiber patch-cord on request)
Synchronization external/internal
PC connection USB
Dimensions 126x68x53 mm
Weight 0.3 kg
CCD array specifications(3)
Model Toshiba 1205DG Toshiba 1304DG Hamamatsu
Number of pixels 2048 3648 1024
Pixel width 14 µm 8 µm 25 µm
Pixel height 200 µm 200 µm 500 µm
Minimum exposure time 4.2 ms 7.3 ms 2.1 ms
Maximum exposure time 4 s 5 s 5 s
Sensitivity(4), photons/count 80 20 650(3000)(5)
Antiblooming(6) yes no yes
Meansquare noise of reading, counts of ADC 5.4 3.5 16(4.4)(5)
ADC 14 bit,
16384 counts
14 bit,
16384 counts
14 bit,
16384 counts
Dynamic range 1000:1 1000:1 1000:1 (4000:1)(5)
(1) - the necessary width and center of the registered range should be specified when placing an order. The ASP-150T has an operational range adjustment function;
(2) - each spectrometer is equipped with a fiber socket and allows measurement of either free-space or fiber signals without any realignment;
(3) - any array can be combined with any grating type;
(4) - sensitivity given at the wavelength of 550 nm;
(5) - the Hamamatsu arrays provide for sensitivity control via special driving signal, that can set either low (values in brackets) or high sensitivity mode;
(6) - the property of the CCD to prevent the charge flow from the neighboring overexposed pixels;
* - values given for the Toshiba 1304DG CCD array.

The miniature spectrometer ASP-75 has a small footprint and weighs 300 grams. The simplicity of the design allows to combine broad spectral range and high resolution with more than compact size. The device can be used in various space-demanding applications and also for OEM integration in any devices. The unit features a special fiber input with a spectral slit, the size of which is conditioned with the detector. It allows measurement of either free-space or fiber signals without any realignment. However, it is not recommended to use fiber to measure spectrum of a femtosecond laser due to signal modulation and subsequent spectrum distortion.

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