Bdtyktl

Patanjali yoga sutras mention 8 stages to reach ultimate union with supreme. Yama, Niyama, Asana, Pranayama, Pratyahara, Dharana, Dhyan, and Samadhi. But while reading tamil literature yesterday,it is mentioned, there are 18 stages in Turiya but have not explained in detail. Does Patanjali yoga sutras or any other yogic, tantra text mention about different stages of Samadhi?

Yes, Swamivivekananda's Raja Yoga on Patanjali's Yoga Sutras:

वितर्कविचारानन्दास्मितानुगमात् सम्प्रज्ञातः ॥१७॥

17. The concentration called right knowledge is that which is followed by reasoning, discrimination bliss, unqualified egoism.

Samadhi is divided into two varieties. One is called the Samprajnâta, and the other the Asamprajnâta.

In the Samprajnata Samadhi come all the powers of controlling nature. It is of four varieties. The first variety is called the Savitarka, when the mind meditates upon an object again and again, by isolating it from other objects.

Again, in the very same meditation, when one struggles to take the elements out of time and space, and think of them as they are, it is called Nirvitarka, without question. When the meditation goes a step higher, and takes the Tanmatras as its object, and thinks of them as in time and space, it is called Savichâra, with discrimination; and when in the same meditation one eliminates time and space, and thinks of the fine elements as they are, it is called Nirvichâra, without discrimination. The next step is when the elements are given up, both gross and fine, and the object of meditation is the interior organ, the thinking organ. When the thinking organ is thought of as bereft of the qualities of activity and dullness, it is then called Sânanda, the blissful Samadhi. When the mind itself is the object of meditation, when meditation becomes very ripe and concentrated, when all ideas of the gross and fine materials are given up, when the Sattva state only of the Ego remains, but differentiated from all other objects, it is called Sâsmita Samadhi. The man who has attained to this has attained to what is called in the Vedas "bereft of body". He can think of himself as without his gross body; but he will have to think of himself as with a fine body. Those that in this state get merged in nature without attaining the goal are called Prakritilayas, but those who do not stop even there reach the goal, which is freedom.

So, the stages of Samadhi goes : Savitarka ➡ Nirvitarka ➡ Savichara ➡ Nirvichara ➡ Sananda ➡ Sasmita ➡ Asamprajnata.

Samadhi is of one type only, here is what Sri Ramana Maharshi said on the kinds of Samadhi:

There is only one kind of samadhi, not many kinds. To remain temporarily subsided in the Reality, without any thought, is nirvikalpa samadhi. Permanently abiding in the Self without forgetting it [even while being active and with eyes open] is sahaja samadhi. Both will give the same happiness.