??????????????????????????????????????????????????????? ??????????????????????????? ???????? ?????????????????????????????????????????? ????????????????????????????????????? ??????????????????? ??????????????????????????? ???????????????? ???????????????????????????? ???????????????????????????? ????????????????????????????? ??????? ???????????????

?????????? ?????????????????????..????????????????????????????????? ? ???????????????????????????????????????????????????????/??? ???????????????????????????????????? ?????? ???????????????External cavity diode lasers (ECDLs): These use an external optical element such as a grating or perhaps a prism to supply comments and wavelength variety as an