Conduction cooled compact laser for the MALIS instrument (original) (raw)

Conduction cooled compact laser for the supercam LIBS-RAMAN instrument

2017

A new conduction cooled compact laser for SuperCam LIBS-RAMAN instrument aboard Mars 2020 Rover is presented. An oscillator generates 30mJ at 1µm with a good spatial quality. A Second Harmonic Generator (SHG) at the oscillator output generates 15 mJ at 532 nm. A RTP electro-optical switch, between the oscillator and SHG, allows the operation mode selection (LIBS or RAMAN). Qualification model of this laser has been built and characterised. Environmental testing of this model is also reported.

New lasers and laser schemes

Applied Physics B Photophysics and Laser Chemistry, 1982

We report results obtained with a high power D20 laser emitting pulses of 1 ps duration at the wavelength of 385 ~ma. Optically pumped with single mode CO2 laser pulses of 100 J in 1.2 ~s, this system produced far infrared pulses via stimulated Raman effect with an energy of up to 140 mJ. The system is developped according to the requirements of a Thomson scattering experiment with the aim of measuring the ion temperature of a Tokamak plasma. While the power achieved still falls short of the required MW level, we have demonstrated that single mode pulses of 1 gs duration can be produced. This is essential for the planned scattering measurement since long pulse operation of the laser will improve the signal-tonoise ratio in the detection system of the scattering experiment.

Fully conductively cooled, diode-pumped Ho:Tm:LuLiF_4 laser oscillator/amplifier

Optics Letters, 2012

A fully conductively cooled and diode-pumped linear Ho:Tm:LuLiF laser oscillator can generate more than 1 J normal mode pulses at a 10 Hz pulse repetition rate where heat pipes are used for cooling pump diodes and laser crystal. As an amplifier, it can amplify the 80 mJ∕180 ns pulses into 400 mJ pulses before the appearance of amplified spontaneous emission (ASE). The ASE threshold is about 5.6 J with a 40 mm long and side-polished laser crystal. For a 5 mJ input pulse and 5.6 J pump pulse, the double-pass gain exceeds 22.5. If the lateral surface of the laser crystal is fine ground, the ASE threshold can rise to higher than 8 J, but the efficiency will be lower due to large pump diffusion.