Soundarya Lahari Verse 36 – Meditation upon Ajna chakra explained

शान्ता विमला प्रकाशा आत्मा गुहा चित् यॊगास्य
श्री परानंदादि सद्गुरून् नमाम्यहम् पुनः पुनः
Shantaa Vimalaa Prakaashaa Aatmaa Guhaa, Chit, yOgaasya SrI Paranandadi sadguroon namaamyaham punah punah.

तवाज्ञाचक्रस्थं तपनशशिकोटिद्युतिधरं
परं शम्भुं वन्दे परिमिलितपार्श्वं परचिता ।
यमाराध्यन् भक्त्या रविशशिशुचीनामविषये
निरालोकेऽलोके निवसति हि भालोकभवने ॥ ३६॥

tavājñācakrasthaṃ tapanaśaśikoṭidyutidharaṃ
paraṃ śambhuṃ vande parimilitapārśvaṃ paracitā ।
yamārādhyan bhaktyā raviśaśiśucīnāmaviṣaye
nirāloke’loke nivasati hi bhālokabhavane ॥ 36॥

“I sing in praise of Supreme Shiva, present in Your Ajñā cakra. Its brilliance is of innumerable suns and moons, spread by Supreme Consciousness on all sides. One who lives in a world that is not reached by sun, moon and fire and is different from the material world, he is living in this Self-illuminating world.”

In this verse Sri Shankara mentions about Ajna Chakra and in the next verses he will mention also other Psychic Chakras.
He says that Siva is self illuminating and the effulgence is brighter than the innumerable Sun,Moon and Fire put together.

.अथ य एव सम्प्रसादोsस्मच्छरीरात्समुत्थाय परं ज्योतिरूप सम्पद्य स्वेन रूपेणाभि निष्पद्यात एष आत्मेति होवाचैतदमृतमभयमेतदूब्रहोति तस्य ह वा एतस्य ब्रह्मणो नाम सत्यमिति

This Vakya is from Chandogya Upanishad ( VIII, 3, 4)

ಅಥ ಯ ಏವ ಸಂಪ್ರಸಾದೋsಸ್ಮಚ್ಛರೀರಾತ್ಸಮುಥ್ಯಾಯ ಪರಂ
ಜ್ಯೋತಿರೂಪ ಸಂಪದ್ಯ ಸ್ವೇನ ರೂಪೇಣಾಭಿ ನಿಷ್ಪದ್ಯಾತ್ ಏಷ ಆತ್ಮೇತಿ ಹೋವಾಚೈತದಮೃತಮಭಯಮೇತದೂಬ್ರಹೋತಿ
ತಸ್ಯ ಹ ವಾ ಏತಸ್ಯ ಬ್ರಹ್ಮಣೋ ನಾಮ ಸತ್ಯಮಿತಿ.
The one who is serene, rising up from this body and reaching the highest light, remains established in his true nature. This is the SELF. This is Immortal. This is beyond all fear. This is Brahman. TRUTH is the name of Brahman who is such.

Siva is self- illuminating prakasha, that is Consciousness The revelation of this illumination is the creation of Universe, that is Vimarsha, that is Shakti. Prakasha and Vimarsha are not just interdependent but they are one and inseparable.
Siva being in Ajna chakra self-illuminating, Shakti also is present pervading all sides. When the devotee experience the illumination of Shiva, by the presence of Shakti who is revealing this illumination, the devotee gets disconnected from the material world and that is the light of SELF.
Illumination referred in this verse comparing to the illumination of innumerable Sun, Moon and fire may also be understood as the experience of the sadhaka of such an effulgent illumination is beyond Ida, Pingala and Sushumna Nadis, which represents Moon, Sun and fire respectively.

न तद्भासयते सूर्यो न शशांको न पावकः
यद्गत्वा न निवर्तन्ते तद्धाम परमं मम

Here Geetacharya tells, that once my supreme abode is reached which is not illumined by Sun, Moon or fire, that is self- illumined, there is no return at all from my supreme abode.
In his Bhashya Sri Shankara gives an analogy of the space in the pot which is limited to pot will not return to pot once the pot is destroyed. The Space in the pot has become one with the unlimited space and hence no return.

One may try meditation on Ajna Chakra, visualising Shakti. Her form appears as conceived and appears in meditation. Then the individual consciousness moves to Turiya State and experience the state of supreme bliss. After some time, one returns to normal state. The bliss enjoyed makes one to repeat the mediation and continuous practice makes one realise one with Siva and Shakti.
Sri Lakshmidhara describes, “parimilitaparshvaM Paricita” as Devi staying in comfort at the left side of Siva in Ajna. He further states that Ajna is not merely “Dvidala padma’ but the mahayogis have experienced 64 Mental rays, manasika Mayukyas. He also gives these 64 names from Para to Mantravigraha Para Is he referring to 64 yoginis mentioned in Tantra Shastra? Quite likely.
It is not known as to why Sri Bhagavatpada started from Ajna Chakra and all other chakras after wards in Verses 37 to 42.
Similarly, Sri Lalita Sahasranama Starts giving description of these Psychic Chakras beginning from Vishuddi and afterwards Anahata, Manipura, Svadhishthana, Muladjara, Ajna and sahasrara.

Any way the meditation on these Chakras are to be learnt from a Guru.

Blog links to all 7 Soundarya Lahari Verses (36 to 42) to meditate 7 Chakras:

Verse 36 – Meditation upon Ajna Chakra

Verse 37 – Meditation upon Vishuddi Chakra

Verse 38 – Meditation upon Anahata Chakra

Verse 39 – Meditation upon Swadistana Chakra

Verse 40 – Meditation upon Manipura Chakra

Verse 41 – Meditation upon Muladhara Chakra

Verse 42 – Meditation upon Sahasrara Chakra

Lokaa samasta sukhino bhavantu samasta sanmangalani bhavantu