"quantum cascade laser" meaning in English

{
  "etymology_text": "quantum after the behavior of electrons and photons, cascade for a series of small steps, describing an implementation of a laser.",
  "forms": [
    {
      "form": "quantum cascade lasers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "quantum cascade laser (plural quantum cascade lasers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Quantum mechanics",
          "orig": "en:Quantum mechanics",
          "parents": [
            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A laser that operates by analogy with an electronic waterfall, with electrons cascading down a series of small steps emitting a photon at each step."
      ],
      "id": "en-quantum_cascade_laser-en-noun-VB28lE4g",
      "links": [
        [
          "laser",
          "laser"
        ]
      ],
      "synonyms": [
        {
          "word": "a.k.a. QC laser"
        },
        {
          "word": "quantum-cascade laser"
        }
      ]
    }
  ],
  "word": "quantum cascade laser"
}

{
  "etymology_text": "quantum after the behavior of electrons and photons, cascade for a series of small steps, describing an implementation of a laser.",
  "forms": [
    {
      "form": "quantum cascade lasers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "quantum cascade laser (plural quantum cascade lasers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "en:Quantum mechanics"
      ],
      "glosses": [
        "A laser that operates by analogy with an electronic waterfall, with electrons cascading down a series of small steps emitting a photon at each step."
      ],
      "links": [
        [
          "laser",
          "laser"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "a.k.a. QC laser"
    },
    {
      "word": "quantum-cascade laser"
    }
  ],
  "word": "quantum cascade laser"
}