HARPIA-TG is a transient grating spectrometer for carrier diffusion coefficient and lifetime measurements. It operates as a non-invasive and non-destructive pump-probe spectrometer exciting the sample with laser interference and, subsequently, recording the transient grating – spatial refractive index modulation. A delayed beam probes the modulation decay, which corresponds to the carrier diffusion. By automated change of the grating period, the technique provides a detailed information on the dynamics of carrier propagation.

Coupled with CARBIDE or PHAROS laser with integrated optical parametric amplifier (I-OPA), the compact system is fully automated and computer-controlled via advanced measurement and analysis software. Thus, the user only needs to put the sample in the holder and start the measurement to obtain the diffusion coefficient in a matter of minutes.

Applications

Transient grating spectroscopy
Single-wavelength transient absorption

Specifications

Model	HARPIA-TG
Grating recording wavelength ¹⁾	300 – 450 nm
Grating period ²⁾	2 – 10 μm
Probe wavelength ³⁾	1030 nm
Temporal resolution	< 290 fs
Delay range	Up to 8 ns

Extendable to VIS–NIR by applying different physical gratings. Contact sales@lightcon.com for details.
Depends on the recording wavelength used. Typically, as low as 1 μm.
SH (515 nm) or OPA-based probe is available upon request. Contact sales@lightcon.com for details.

Dimensions

Model	HARPIA-TG
Physical dimensions (L × W × H)	730 × 420 × 188 mm

Transient grating decay of GaN at different fluence

Diffusion coefficient of GaN as a function of fluence

Images & Drawings

Drawing of HARPIA-TG

Recommended layout with CARBIDE-CB5 and I-OPA

HARPIA-TG dedicated software

HARPIA-TG offers a dedicated software that enables fully automated selection of pump and probe parameters and grating period, thus, making the measurements of diffusion coefficient and carrier lifetime as simple as possible.