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BTS2048-BS CCD spectroradiometer for LASER radiation

The BTS2048-BS meets all the requirements of a high performance CCD spectroradiometer for measurement of laser diodes in the blue spectral range.

One of its unique features is its BiTec sensor, which combines a back-thinned CCD based spectroradiometer with a radiometric Si photodiode. This combination provides high linearity levels as well as extremely fast measurements. The fully linearized 2048 pixel CCD detector has a very wide dynamic range thanks to its integrating times that range from 2 µs to 4 s. This makes it possible to measure laser diodes over a wide intensity range. The optical grid arrangement limits the spectral measurement range to between 400 nm and 530 nm hence resulting in a very small optical bandwidth (0.3 nm). Si photodiodes exhibit exceptionally high linearity levels across their dynamic range. This makes the photodiode within the BiTec sensor ideal for additional linearization of the CCD (article on the BTS technology)  The radiometric responsivity function of the photodiode may be used independently of the CCD enabling fast CW measurements even at low intensities. Any  radiometric mismatch can be auto-corrected  using spectral data from the CCD. Despite its compact dimensions (103 mm x 107 mm x 52 mm – LxWxH), the BTS2048-BS spectroradiometer has a remote-controlled filter wheel with two OD filters and a shutter for dark measurement.

Direct mounting instead of using a light guide

The BTS2048-BS spectroradiometer has a diffuser window and can therefore be used to measure the irradiance, spectrum and peak wavelength, without the need for any additional equipment. The diffuser window also enables the BTS2048-BS to be mounted directly onto accessories such as integrating spheres, radiance intensity measurement lenses, and goniometers in order to measure the radiant power, radiant intensity, and radiant intensity distribution.

User software and developer software

The standard  S-BTS2048 user software has a customizable user interface and a large number of display and function modules which can be activated when configuring the BTS2048-BS with the respective accessory components from Gigahertz-Optik GmbH.

The S-SDK-BTS2048 developer software is recommended for integration of the BTS2048-BS in the user’s own software.


One essential quality feature of photometric devices is their precise and traceable calibration. The BTS2048-BS is calibrated by Gigahertz-Optik’s calibration laboratory which has been accredited by DAkkS (D-K-15047-01-00) for the spectral responsivity and spectral irradiance in line with ISO/IEC 17025. The calibration also included the corresponding accessory components. Every device is delivered with its respective calibration certificate.

The BTS2048-BS spectroradiometer for blue laser
The BTS2048-BS can directly plugged on a integrating sphere
Electronic Shutter reduces the measurement time
Ethernet interface reduces the datatransfer time
S-BTS2048 User software interface
Graphical view of the spectrum
S-SDK-BTS2048 Software development kit for device integration in customer software
Short description

CCD spectrometer with a wide dynamic range for CW and short-term measurement of the irradiance, spectrum, and peak wavelength. Accessories for measurement of other parameters.

Main features

Compact device. BiTec detector with a back-thinned CCD (2048 pixels, 0.3 nm optical resolution, 400 nm to 530 nm, electronic shutter) and Si photodiode with a radiometric filter. Optical bandwidth correction (CIE 214). Filter wheel with shutter and attenuation filters. Input lens with a diffusor window. Cosine field of view

Measurement range

Spectral: (1E-3 - 1E7) W/(m²nm), 400 nm to 530 nm

typical applications

CCD spectroradiometer for design applications. Module for integration in test systems


Factory calibration. Traceable to international standards

Spectral Detector
Integration Time

2 μs - 4 s        *1

spectral range

(400 - 530) nm

Optical Bandwidth

0.3 nm

Pixel resolution

~0.07 nm/Pixel

Number of pixels



Highly sensitive back-thinned CCD chip


16bit (25 ns instruction cycle time)

Peak wavelength

± 0.025 nm


Standard illuminant A 50K; LED up to ± 4% depending of the LED spectrum

Band-pass correction

mathematical online band-pass correction is supported


completely linearized chip >99.6%

Stray Light

3E-4           *2

Base line noise

5 cts     *3


5000        *4

dynamic range

>9 Magnitudes

spectral irradiance responsivity range

(1E-3 - 1E7) W/(m²nm)           *5*6

typical measurement time

10 W/m² (400 - 530) nm Standard Illuminant A: 440ms
100 W/m² (400 - 530) nm Standard Illuminant A: 44ms

Integral Detector

Spectral responsivity with radiometric matching. Online correction of the radiometric matching through spectral measurement data (spectral missmatch factor correction).

Measurement time

20 µs  - 6000 ms


rise time (10 – 90) %


50 µs


65 µs


1.5 ms

Measurement range

seven (7) measurement ranges with transcendent offset correction


Irradiandce ± 5 %

Measured Quantity

Spectral irradiance (W/(m² nm)), peak wavelength, center wavelength, centroid wavelength, Option integrating sphere: in addition radiant power (W) and spectral radiant power (W/nm), Option goniometer: in addition spectral radiant intensity and radiant intensity distribution

Input optics

Diffusor, cosine corrected field of view (f2 ≤ 3 %)

Filter wheel

4 positions (open, closed, OD1, OD2). Use for remote dark current measurement and dynamic range extension.


Parallel measurement with diode and array is possible, thereby linearity correction of the array through the diode and online correction of the spectral mismatch of the diode through a*(sz(λ)) respectively F*(sz(λ)).

Calibration uncertainty

Spectral irradiance

(400 - 530) nm: OD0: +/- 4 % OD1: +/- 4 % OD2: +/- 4 %
spectral responsivity

responsivity BTS2048 BS


32bit for device control,16bit for CCD array control, 8bit for photodiode control


USB V2.0, Ethernet (LAN UDP protocol), RS232, RS485

Data transfer

Standard for 2048 float array values via ethernet 7ms, via USB 2.0 140 ms

Input Interfaces

2x (0 - 25) VDC, 1x optocoupler isolated 5 V / 5 mA

Output Interfaces

2x open collector, max. 25 V, max. 500 mA


Trigger input incorporated (different options, rising/falling edge, delayed, etc.)


User software S-BTS2048
Optional software development kit S-SDK-BTS2048 for user software set-ups based on .dll‘s in C, C++,C# or in LabView.

Power Supply

With power supply: DC Input 5V (±10 %) at 700 mA
With USB bus (500mA) *7


103 mm x 107 mm x 52 mm (Length x Width x Height)


500 g


Tripod and M6 screw threads

Front adapter UMPA-1.0-HL for use with integrating sphere port-frame UMPF-1.0-HL

temperature range

Storage: (-10 to 50) °C

Operation: (10 to 30) °C           *8


*1 It is recommended to perform a dark signal measurement for every change in the integration time
*2 typical value, measured 120nm left of the peak of a LED, blocked by GG435
*3 *4 typical value measured without averaging for a 4ms measurement time and full scale control of the array. Averaging results in quadratic rise of the S/N
i.e. quadratic fall of the base noise e.g. averaging to a factor 100 improves the S/N by a factor 10
*5 Minimum 500/1 S/N. Maximum at full scale control.
*6 Irradiation only allowed for a short time so as to avoid thermal damage
*7 during USB connection, not all functions are available due to the limited current supply e.g. no Ethernet
*8 Device required for temperature stabilization in approx. 25min. In measurement is performed in the warm-up phase, or if measurements are performed under varying temperatures, dark signal measurement is required for each measurement. At high temperatures and at the maximum integration time a decreased dynamic can be used.
*9 measurement of a white LED and 20000 counts


Type Description File-Type Download
Datasheet BTS2048-BS PDF
BTS2048-Series BTS2048 'Not just another spectrometer' brochure PDF
Produktname Product Image Description Show product
S-SDK-BTS2048 Software Development Kit for BTS2048 variants.
Article-Nr Modell Description Request / Compare
15298459 BTS2048-BS

Measuring device, hard cover box, users guide, S-BTS2048 software, calibration certificate.

15300499 K-BTS2048-VL-I

Recalibration of the BTS2048-BS with calibration certificate

15298470 S-SDK-BTS2048

Software development kit with users guide.

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