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NIR Optical Bench Options

SMA 905 Connector

A precision SMA 905 Connector aligns to the spectrometer’s entrance slit and ensures concentricity of the fiber. For an upgrade fee that includes the cost of the custom connector and labor, we will replace the standard SMA 905 Connector with a different connector of your choice. We also offer connector adapters, such as an SMA-to-ST Adapter and an SMA-to-FC Adapter. Please call for details on custom connectors and adapters.

Fixed Entrance Slit

Another option available with "NIR" User-configured Spectrometers is selecting the size of the entrance aperture. Entrance slits are rectangular apertures, 1-mm tall and various widths from 10 µm to 200 µm, with the width determining the amount of light entering the bench. Note that the smallest slit achieves the best optical resolution. (For more on how your slit choice affects optical resolution, click here.) A slit is permanent; it only can be changed by our technicians. You can opt against having a slit, in which case the diameter of the fiber connected to the spectrometer determines the size of the entrance aperture.

Slit	Description	NIR-512 Pixel Resolution	NIR256-2.1 Pixel Resolution	NIR256-2.5 Pixel Resolution	Price
SLIT-10	10-µm wide x 1-mm high	~2.4	~1.2	~1.2	$174
SLIT-25	25-µm wide x 1-mm high	~2.4	~1.2	~1.2	$174
SLIT-50	50-µm wide x 1-mm high	~2.9	~1.5	~1.5	$174
SLIT-100	100-µm wide x 1-mm high	~4.4	~2.2	~2.2	$174
SLIT-200	200-µm wide x 1-mm high	~7.9	~4.0	~4.0	$174

Choosing a Grating & Wavelength Range

Here are the Grating Selection Chart and the Grating Efficiency Curves for the two gratings available with the “NIR” optical bench. Click here for your "NIR" Grating Efficiency Charts.

Grating Number	Grating N1	Grating N2
Intended Use	NIR-512 or NIR256-2.1	NIR256-2.1 or NIR256-2.5
Groove Density	300	150
Spectral Range	900 nm	1600 nm
Blaze Wavelength	1000 nm	1600 nm
Best Efficiency	700-2100 nm	700-2500 nm

Detectors

In the “NIR” Spectrometers, we offer three different InGaAs linear array detectors, one 512-element array and two 256-element arrays. The Hamamatsu detectors used in the “NIR” Optical Bench are InGaAs photodiode linear arrays with each pixel connected to a charge amplifier array consists of CMOS transistors. These detectors deliver high sensitivity and stable operation in the near infrared. The detectors all include onboard thermoelectric cooling. A thermistor monitors the array's temperature and a thermoelectric device can cool the arrays to 30 °C below ambient, keeping the array stable to within ±0.1 °C. In addition, you can set and monitor the detector's temperature via software. The detector is included with the price of the NIR Spectrometer.

Detector Specification	NIR-512	NIR256-2.1	NIR256-2.5
Detector:	Hamamatsu G9204-512 InGaAs linear array	Hamamatsu G9206-256 InGaAs linear array	Hamamatsu G9208-256 InGaAs linear array
Detector range:	850-1700 nm	900-2100 nm	900-2550 nm
Pixels:	512	256	256
Pixel size:	25 µm x 500 µm	50 µm x 250 µm	50 µm x 250 µm
Pixel well depth:	187,000,000 electrons	187,000,000 electrons	187,000,000 electrons
Defective pixels:	None	2%	5%

Detector Spectral Response Curve

This graph compares the spectral response of the three NIR detectors at an operating temperature of 25 °C.

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