Ultrafast Spectroscopy

Pump and Probe Experiments

Ultrafast spectroscopy laboratory has ultrafast Ti:Sapphire laser oscillator, regenerative amplifier, and transient absorption spectrometer system. This system can be used as a stand-alone system. The system is also designed such that it can be synchronized with free electron laser to perform pump and probe experiments.

TARLA Table-Top Ultrafast Laser, Regenerative Amplifier and Optical Parametric Amplifier System

Schematic representation of table-top ultrafast laser system

TARLA Table-Top Laser System Technical Specifications

Parameters		Unit	Value
Laser Oscillator
Central Wavelength		nm	800 ± 10
Average Power		mW	> 800
Bandwidth (FWHM)		nm	>70nm
Pulse width		fs	< 20
Pulse repetition		MHz	78
Pulse timing jitter*		fs	<150
Noise (rms 1Hz-100kHz)		%	0,05
Power stability (peak-to-peak for 24 hours)		%	0,05
Laser Amplifier
Central Wavelength		nm	800 ± 10
Pulse Energy		mJ	> 13
Pulse width (FWHM)		fs	< 40
Pulse repetition		kHz	1
Pulse timing jitter*		fs	<150
RMS Energy stability over 24 hours		%	<0.75
Optical Parametric Amplifiers
Tuning Range 1	Wavelength	nm	235 – 1160
	Pulse energy	µJ	> 3- 40
Tuning Range 2	Wavelength	nm	1160 – 2600
	Pulse energy	µJ	>250
Tuning Range 3	Wavelength	nm	2600 – 4500
	Pulse energy	µJ	> 0.5 – 2
Amplitude amplitude fluxtion (rms)		%	<1.5
Pulse Timing Jitter*		fs	<150

TARLA Ultrafast Transient Absorption Spectrometer (TAS) System

Image of ultrafast transient absorption system (https://www.newport.com/f/transient-absorption-spectrometer)

TARLA Ultrafast Transient Absorption Spectrometer System (TAS) Technical Specifications

Parameters	Unit	Value
Probe Spectral Range	nm	330-1600
Pump-Probe Delay Range	ns	8 or longer
Delay Stage Maximum Speed	ns	10 or faster
Time Resolution		~ 1.4 times the pump or probe duration
Visible Camera Range	nm	200 – 1000
NIR Camera Range	nm	650 – 2500
Spectrometer Spectral Range	nm	200 – 20 000
Spectrometer Spectral Resolution	nm	0.13 to 7.95