1. UNIT - V

6. (Angular spread 10 micro radians)

45. Laser-Professionals.com Courtesy of Metrologic, Inc.

56. He N2N2 CO 2 Vacuum Pump NaCl Window Mirror LASERLASER

66. Injection Of electrons Injection Of holes Active region

73. i.e. to measure atmospheric pollutants, Ozone concentration, water vapor concentration.

86. Cladding(n 2 ) Core(n 1 ) Axis of the fiber Incident ray

88. (1)

89. (2)

90. (3) (4)

91. (5)

93. Cladding(n 2 ) Core(n 1 ) Axis of the fiber Incident light ray

94. Cladding(n 2 ) Core(n 1 ) Axis of the fiber Incident light rays

98. Cladding(n 2 ) Core(n 1 ) Axis of the fiber Incident light ray

99. Cladding(n 2 ) Core(n 1 ) Axis of the fiber Incident light rays

107. Drive circuit Photo detector Light source Amplifier Signal restorer