Femtosecond Multipass Ti:Sapphire Amplifier Multus

    The Multus MPA multipass femtosecond amplifier is designed to provide mJ-level output by amplifying pulses from a Ti:S or fiber ultrafast seed oscillator. The amplification ratio in such a system is more than 10^6 and happens in a Ti:S crystal during several passes while pumping by a Q-switched 515-532 nm laser. The advantage of multipass amplifiers over regenerative amplifiers is smaller pulse broadening and better contrast between the amplified pulse and ASE. Thus, in the Multus MPA scheme the pulse passes through the Pockels cell only once. This reduces overall dispersion and allows to amplify pulses of <30 fs with little to no broadening.
   The Multus systems comprise an ultrafast seed oscillator (solid-state TiF-20F or fiber EFOA-SH), stretcher, Fraday isolator, Pockels cell, control and synchronization unit, multipass amplifier, pulsed amplifier pump laser, compressor. All elements are integrated into a single box for better overall stability.
   The hybrid system Multus MATEKO comprises two amplifiers: a regenerative stage and a multipass stage, thus enabling higher pulse energies. A single pump laser is used to pump both stages which reduces the cost of the system and boosts stability and performance. Additional Pockels cell allows full control over the PRR and increases the contrast ratio to 10^4 level at >5 ns.
   Upon customer’s request we will offer systems with output pulse energy >150 mJ and TW peak power level. The Multus systems can also be upgraded in stages to fit customer’s funding schedule.

		MPAPOP	MPAPOP-1000	MATEKO-10/15	MATEKO-30/10
	Installed seed oscillator	TiF-20F**
	Repetition rate, Hz	10, 20 or 50	1000	15	10
	Pulse energy, mJ	>1*	>0.6	>10*	>30*
	Pulse width, fs	<35	<35	<50
	Central wavelength, nm	800±15
	M2	<1.3
	Beam diameter (1/e2), mm	6-7
	Stability, % rms	<3
	Contrast ratio	>103:1 @ 10 ns >103:1 @ 1 ps >106:1 @ 5 ps >5x107:1 @ 10-20 ps >5x107:1 @ ASE		>104 (>5 ns)
	Spatial profile	TEMoo
	Output polarization	linear, horizontal
	Optical head dimensions, mm	1200x900x200
	Water cooling	the package includes closed-loop water chiller
	* - systems with pulse energy >150 mJ are available upon request ** - fiber seed oscillator may be installed upon request (<120 fs, 780 nm)