JAXA’s Martian Moons eXploration (MMX) mission is a project to explore the two moons of Mars, with the launch currently being scheduled for 2024. Part of the project is raman spectroscopy to investigate fingerprints of organic compounds. The green 532 nm laser is an adaption from EXOMARS’ raman laser, providing ⪆100 mW in a singlemode fiber at a spectral bandwidth ⪅10 pm. Solderjet bumping as a laser-based soldering and thus optics bonding technology has been employed for the attachment of all miniaturized components of the two-channel DPSS configuration with intra-cavity frequency conversion by means of a BBO crystal. The integration platform is a DCB substrate for thermal connection, the system including fiber-coupling fits into a butterfly-alike housing ⪅10e5 mm3 volume, and ⪅10 g mass. Stability of the soldered optics in the <10 arcsec range was proven also during thermal vacuum, mechanical and radiation testing for space conditions.
Low-stress bonding using the laser-based soldering technique Solderjet Bumping is presented for the assembly of optical systems. Selected systems include SQ1 and INVAR 36 (baseline system), CaF2 and 1.4371 stainless steel, BBO and Dilver P1, and KTP and Super Invar, the first two proposed as lens demonstrators and the other two as laser crystal demonstrators. Solder parameters found for the SQ1 and INVAR using the DoE method using 400μm SAC305 alloy with the desirability of 0.655, for BBO and Dilver P1 and CaF2 and stainless steel 1.4371 systems, parameters must be changed due to damage observed in the optical components. KTP and Super Invar system parameters are still under investigation. In the case of BBO, the parameters were successfully found while CaF2 is still under investigation, changing the solder bump size due to the constant presence of damage in the samples. Finite elements simulations show that excessive stress occurs locally at the singularity of the soldered interface, but is still below the critical value, nevertheless, the survival of the demonstrators under environmental loads (Δ60 K, 600 g) is expected.
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