ALS MSM ultra fast photo detector

The UltraFast MSM photo detectors have a bandwidth up to 35 GHz and can measure signals with wavelengths from below 400 nm up to 1.6 µm. The detectors are optimized for minimal pulse tail and oscillation-free impulse response. These excellent features are ob­tained by exploiting the inherent advantages of the MSM (metal-semiconductor-metal) detector configuration such as low capacitance, low series resistance and large active area. Special structures and dopants enhance the responsivity and lower the electrical noise. The MSM detectors are an ideal choice for precisely characterizing the time and frequency response of high-speed optical sources and light wave systems.

Specifications

	UltraFast-20-xx
detector type	MSM (Metal - Semiconductor - Metal)
active material	InGaAs
bandwidth (-3 dB electrical)	DC - 20 GHz
rise time (10% - 90%)	< 12 ps
pulse width (FWHM)	< 20 ps
wavelength range	<400 nm - 1.6 µm
maximum responsivity*	0.24 A/W @ 810 nm 0.19 A/W @ 1.3 µm 0.12 A/W @ 1.5 µm
bias voltage	2 V - 9 V
bias input connector	SMC male
standard RF signal output connector	K-Type female

* Dependent on the coupling scheme, the values for the responsivity can be lower

Options

UltraFast-20-xx	Description
SM	Optical Input: Single Mode Fiber 9 µm core with FC/PC Connector
MM	Optical Input: 50 µm or 62.5 µm Multi Mode Fiber with FC/PC Con­nector
FS	Optical Input: Free Space

Accessories

UltraFast-xx	Description
BC	Bias Supply Cable. Cable for the connection to an external voltage supply with SMC connector. (Detector SMC to male BNC). Cable length 1.5 m. For customers using their own DC-bias-source.
BB	Battery Supply Box. (Voltage supply for all UltraFast photo detec­tors with SMC connector). For 6 V bias (+/-) incl. supply cable. Small battery case incl. two long lasting replaceable 3 V lithium coin cells and connector cable to SMC; cable length 0.5 m.
KM	RF connector K-Type Male (instead of standard K-type female)
C1	Collimator Optics with FC/PC connector for the connection of fiber cables f = 11 mm; for wavelengths 350 - 600 nm.
C2	Collimator Optics with FC/PC connector for the connection of fiber cables f = 11 mm; for wavelengths 600 - 1050 nm
C3	Collimator Optics with FC/PC connector for the connection of fiber cables f = 11 mm; for wavelengths 1050 - 1550 nm
FO	Focusing Optics (f = 6 mm) for the free space version "UltraFast 20 FS" with a hole aperture 1.0 mm diameter
MA	Mounting Adapter for C1 - C3
MH	Mirror Holder. For 1" optics fitting to mounting adapter MA
AC	Optical input FC/APC connector (angle 8° for reduced back reflexion)