21 November 2017 Conduction cooled compact laser for the MALIS instrument
Author Affiliations +
Proceedings Volume 10568, International Conference on Space Optics — ICSO 2004; 105680O (2017) https://doi.org/10.1117/12.2308015
Event: International Conference on Space Optics 2004, 2004, Toulouse, France
Abstract
A new conduction cooled compact laser for laser induced spectroscopy is presented. An oscillator combined to an amplifier is designed to generate 30mJ at 1≠m with a good spatial quality.
Durand, Decaux, Falcoz, Saccoccio, and Sylvestre: CONDUCTION COOLED COMPACT LASER FOR THE MALIS INSTRUMENT

1.

INTRODUCTION

This communication describes a diode pumped laser based on innovative pumping laser head, cooled by conduction. This compact laser, designed to work in burst mode in very stringent temperature conditions, necessitates no active cooling, neither for the laser diode nor for the laser medium. One application foreseen is laser induced spectroscopy on MALIS instrument. Other potential applications for this laser like telemetry are under study.

2.

LASER ARCHITECTURE AND PERFORMANCES DATA

The laser runs in the nanosecond regime, at a repetition rate of 15Hz maximum. Its architecture is based on an oscillator followed by a double-passed amplifier. The oscillator provides a beam with a high beam quality. The output energy is enhanced in the amplifier while keeping good spatial beam characteristics.

2.1

The oscillator

The pumping head is composed by a Nd : KGW rod longitudinally pumped by an autostack. The main advantage of the autostack is its very high brightness. It provides a peak power of 1 kW for a 100 μs pulse duration. The very high spectral acceptance of the Nd : KGW rod provides very small absorption variations over wide temperature ranges. This allows both the diode and the rod to be conductively cooled and run on the large temperature variations of the mission.

Fig. 1 shows the oscillator energy versus the autostack temperature measured on a table top prototype. For a diode temperature range as large as 25°C, the energy decrease is less than 20%.

Fig. 1

Oscillator energy versus autostack temperature

00334_PSISDG10568_105680O_page_2_1.jpg

The oscillator is linear and composed of the pumping structure and two mirrors. A polarizer, wave-plate and pockels cell Q-switch the cavity. Fig. 2 shows a mechanical drawing of the oscillator. It should provide an output energy of 13mJ with a pulse duration < 10ns, and a quality factor < 3.

Fig. 2:

Mechanical drawing of the oscillator

00334_PSISDG10568_105680O_page_2_2.jpg

Due to the mission constraints, compactness and weight were two driving factors of the mechanical design, keeping the necessary ruggedness at the same time. Oscillator dimensions are about ϕ50 x 200 mm, and weight is about 300 g

2.2

The amplifier

The pumping head for the amplifier is identical to the oscillator one. The laser beam emitted by the oscillator enlarged by a telescope travels twice the amplifier, in order to increase the extraction efficiency.

Fig. 3:

Mechanical drawing of the amplifier

00334_PSISDG10568_105680O_page_3_1.jpg

An output energy in excess of 30 mJ should be obtained at the system output, with a M2 factor < 3.

Acknowledgement

This work is performed in the frame of a laser feasibility study for the MALIS instrument. It is funded by CNES, under contract No. DTS/AE/INS/TO-02-053.

© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
E. Durand, E. Durand, D. Decaux, D. Decaux, F. Falcoz, F. Falcoz, M. Saccoccio, M. Saccoccio, M. Sylvestre, M. Sylvestre, } "Conduction cooled compact laser for the MALIS instrument", Proc. SPIE 10568, International Conference on Space Optics — ICSO 2004, 105680O (21 November 2017); doi: 10.1117/12.2308015; https://doi.org/10.1117/12.2308015
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