**9. Study of intensity imbalance on cloud formation**

The maximum optical power for the cooling and repumping lasers was nearly 48 mW. The imbalance was started keeping the repumping laser at 48 mW and changing the optical power from the cooling laser. The visibility of the cold cloud reached its minimum value as the power was decreased to 10 mW that is nearly 1/5 of its initial value. On the other hand as the cooling laser is kept at 48 mW, the optical power from the repumping laser was decreased to up to 103 microwatts. At this power the cloud was faintly visible. The power ratio between full visibility and threshold was 1/466 for the repumping laser when the cooling laser was kept at its maximum value. In summary the lasers had large intensity difference and the cloud was still visible. To our knowledge this is the largest power difference disclosed in the open literature between the repumping and cooling lasers.
