FPAS Mid-Infrared Array Spectrometer

Femtosecond Pulse Acquisition Spectrometer: a turn-key high-speed mid-infrared (MWIR) array spectrometer for ultrafast spectroscopy, femtosecond pump-probe, transient absorption, and 2D IR vibrational spectroscopy.

System Overview

Drop-In Femtosecond Spectroscopy

The FPAS spectrograph provides a turn-key, drop-in solution for femtosecond Pump-Probe 2D Vibrational Spectroscopy. All required components are provided, including a host computer and LabVIEW-based LASPEC software. Simply focus the laser energy into the entrance slit and start acquiring data.

ISDC has partnered with Horiba Jobin Yvon to integrate a high-resolution spectrometer with detector and acquisition electronics to provide an easy-to-use system for complete spectral acquisition. Interchangeable grating turrets allow complete coverage of the mid and long-wave infrared bands.

The FPAS integrates and captures detector signals from short pulse, high-energy laser systems with excellent linearity and 16-bit resolution: from single pulses or up to 1×10⁶ pulses in sequence, with no lost data.

3–10

Standard spectral range (µm)

16-bit

ADC resolution

125 kHz

Max laser rep. rate

1×10⁶

Sequential spectra, no lost data

Key Features

✓ 3–10 µm standard range (1–20 µm available)
✓ 6.2 nm standard resolution (3.1 nm optional)
✓ DC – 125 kHz laser repetition rate, no lost data
✓ Integrated LabVIEW LASPEC software with open source code
✓ Simultaneous sampling of all array elements
✓ Dual-row arrays for isolated reference and sample paths

Technical Data

Specifications

Spectrometer

Type	Corrected Cross Czerny-Turner, On-Axis Grating
Focal Length	0.32 meters
Entrance Aperture	F/4.1, 15°
Entrance Slit	Motorized 0–2 mm in 2 µm steps (0.25 mm nominal)
Exit Slit	Motorized 0–2 mm in 2 µm steps
Exit Ports	Array and single element, motorized flip mirror
Gratings (std.)	150 g/mm @ 5 µm, 75 g/mm @ 5 µm, 50 g/mm @ 6 µm
Max Resolution	0.35 nm with 1200 g/mm grating

Acquisition System

Laser Rep. Rate	Single shot to 125 kHz
Resolution	16-bit
Spectral Acq. Rate	Single to 1,900 spectra/sec
Max Sequential Spectra	Typically 1×10⁶ (RAM limited)
Communications	10–20 MHz digital port; PC-USB spectrometer control
Standard Detector	liquid nitrogen-cooled MCT Array, 64-element, 0.2 mm W × 0.5 mm H (sourced on customer behalf)
Array Length	16 mm (128-element available)
Software	LabVIEW LASPEC (open-architecture, source included)

Standard Spectral Range & Dispersion

Grating	Spectral Range	Bandwidth	Dispersion
150 g/mm	3–9 µm	0.40 µm	6.2 nm/pixel
75 g/mm	4–10 µm	0.80 µm	12.4 nm/pixel
50 g/mm	3–9 µm	1.2 µm	18.6 nm/pixel

Available Configurations

FPAS Array Integrator Models

All FPAS models share the same core acquisition specs: 1 fs – 2 µs laser pulse width, 0.5–20 µm wavelength range, boxcar integration (50 ns – 5.1 µs), >50,000:1 SNR, <1.5 nV/√Hz total noise, 16-bit resolution, and include a Windows PC with LabVIEW LASPEC software.

FPAS-3216

32-Channel Array Integrator

Channels32 (single row)

External Inputs16

Detector TypesPV/PC MCT, InSb, Si, InGaAs

PowerInternal supply

FPAS-6416

64-Channel Array Integrator

Channels64 (single row)

External Inputs16

Detector TypesPV/PC MCT, InSb, Si, InGaAs

PowerInternal supply

FPAS-6416-D

Dual-Row (2 × 32) Integrator

ChannelsDual rows of 32

External Inputs16

Use CaseIsolated reference & sample paths

Detector TypesPV/PC MCT, InSb, Si, InGaAs

FPAS-0144

128-Channel Array Integrator

Channels128 (single row)

External Inputs16

Detector TypesPV/PC MCT, InSb, Si, InGaAs

PowerInternal supply

FPAS-0144-D

Dual-Row (2 × 64) Integrator

ChannelsDual rows of 64

External Inputs16

Use CaseIsolated reference & sample paths

Detector TypesPV/PC MCT, InSb, Si, InGaAs

Ready to Configure Your FPAS System?

All FPAS models include a Windows PC and LaSpecMX software. Contact our engineers to discuss detector selection, spectral range, and channel count for your application.

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